Annual report pursuant to Section 13 and 15(d)

DEBT - Narrative (Details)

v3.7.0.1
DEBT - Narrative (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 21, 2016
USD ($)
Dec. 31, 2012
USD ($)
$ / shares
Mar. 31, 2017
USD ($)
$ / shares
Mar. 31, 2017
USD ($)
$ / shares
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]              
Debt issuance fees $ 4,700,000   $ 4,700,000 $ 4,700,000      
Gain (loss) on debt extinguishment       41,000 $ 394,000 $ 1,295,000  
Deposits 1,000,000            
Long-term debt     131,590,000 131,590,000      
Credit agreement              
Debt Instrument [Line Items]              
Debt issuance fees 3,100,000            
Reserve requirement     20,000,000.0 20,000,000.0     $ 20,000,000
Debt discount 1,000,000            
Loan commitment fee 600,000            
Credit agreement | Letter of credit              
Debt Instrument [Line Items]              
Long-term debt 1,000,000            
Term loan agreement              
Debt Instrument [Line Items]              
Aggregate principal amount     $ 50,000,000 $ 50,000,000 0    
4.50% convertible subordinated notes              
Debt Instrument [Line Items]              
Aggregate principal amount   $ 70,000,000          
Stated interest rate (as a percent)   4.50% 4.50% 4.50%     4.50%
Conversion ratio   75.896          
Conversion ratio applied per principal amount   $ 1,000          
Conversion price (usd per share) | $ / shares   $ 13.20 $ 13.2 $ 13.2   $ 34.64  
Debt issuance fees     $ 2,300,000 $ 2,300,000      
Quarterly repayment of original principal balance (percent)             1.25%
4.50% convertible subordinated notes | Convertible subordinated debt              
Debt Instrument [Line Items]              
Stated interest rate (as a percent)     4.50% 4.50%      
Extinguishment of debt     $ 6,900,000        
Repayments of Subordinated Debt     6,800,000        
Gain (loss) on debt extinguishment     (100,000)        
Credit agreement with Wells Fargo              
Debt Instrument [Line Items]              
Repayments of outstanding balance 60,300,000            
Credit agreement with Wells Fargo | Credit agreement              
Debt Instrument [Line Items]              
Aggregate principal amount     0 $ 0 62,709,000    
Credit agreement with Wells Fargo | Convertible subordinated debt              
Debt Instrument [Line Items]              
Gain (loss) on debt extinguishment 100,000            
Term loan agreement              
Debt Instrument [Line Items]              
Debt issuance fees     1,200,000 1,200,000      
Debt discount     1,000,000 1,000,000      
DDTL     20,000,000 $ 20,000,000      
Interest rate during the period       8.55%      
Term loan agreement | Federal funds rate              
Debt Instrument [Line Items]              
Interest rate margin       0.50%      
Term loan agreement | One month LIBOR              
Debt Instrument [Line Items]              
Interest rate margin       1.00%      
Term loan agreement | Base rate              
Debt Instrument [Line Items]              
Interest rate margin       3.00%      
Term loan agreement | Prime rate quoted by the Wall Street Journal | Minimum              
Debt Instrument [Line Items]              
Interest rate margin       6.00%      
Term loan agreement | Prime rate quoted by the Wall Street Journal | Maximum              
Debt Instrument [Line Items]              
Interest rate margin       7.25%      
Term loan agreement | LIBOR rate plus senior net leverage ratio | Minimum              
Debt Instrument [Line Items]              
Interest rate margin       7.00%      
Term loan agreement | LIBOR rate plus senior net leverage ratio | Maximum              
Debt Instrument [Line Items]              
Interest rate margin       8.25%      
Term loan agreement | Credit agreement              
Debt Instrument [Line Items]              
Amount borrowed 50,000,000.0            
Revolving credit agreement              
Debt Instrument [Line Items]              
Debt issuance fees 1,900,000            
Credit agreement commitment fee $ 600,000            
Line of credit facility, percent commitment fee on undrawn amounts 0.375%            
Revolving credit agreement | Federal funds rate              
Debt Instrument [Line Items]              
Interest rate margin 0.50%            
Revolving credit agreement | One month LIBOR              
Debt Instrument [Line Items]              
Interest rate margin 1.00%            
Revolving credit agreement | One month LIBOR margin | Minimum              
Debt Instrument [Line Items]              
Interest rate margin 1.50%            
Revolving credit agreement | One month LIBOR margin | Maximum              
Debt Instrument [Line Items]              
Interest rate margin 2.50%            
Revolving credit agreement | Credit agreement              
Debt Instrument [Line Items]              
Aggregate principal amount     46,400,000 $ 46,400,000      
Amount borrowed $ 26,000,000.0            
Available uncommitted accordion 20,000,000            
Revolving credit agreement | Credit agreement | Revolving credit agreement              
Debt Instrument [Line Items]              
Aggregate principal amount     $ 18,500,000 $ 18,500,000 $ 0    
Restricted reserve funded amount 10,000,000            
Reserve requirement 20,000,000.0            
Line of credit facility, maximum borrowing amount $ 80,000,000            
Credit agreement interest rate     3.86% 3.86%