Quarterly report pursuant to Section 13 or 15(d)

DEBT (Details)

v3.3.1.900
DEBT (Details)
 3 Months Ended 9 Months Ended
Oct. 05, 2015
USD ($)
Dec. 31, 2015
USD ($)
Rate
Dec. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Rate
Dec. 31, 2014
USD ($)
Nov. 15, 2015
USD ($)
Debt Instrument [Line Items]            
Loss on debt extinguishment   $ (394,000) $ 0 $ (394,000) $ 0  
Repayments of convertible subordinated debt       83,735,000 $ 0  
Wells Fargo Credit Agreement            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing amount   75,000,000   75,000,000    
Outstanding balance on letters of credit   $ 68,900,000   $ 68,900,000    
Weighted average interest rate | Rate   3.24%   3.24%    
Line of Credit Facility, Maximum Borrowing After Letters of Credit   $ 5,100,000.0   $ 5,100,000.0    
Line of credit facility, frequency of commitment fee payment       Quarterly    
Line of credit facility, percent commitment fee on undrawn amounts       0.375%    
Minimum percent of debt holders required to give written notice of default       25.00%    
Line of credit facility, average liquidity when covenant is applied   15,000,000.0   $ 15,000,000.0    
Line of credit, minimum liquidity at all times when covenant is applied   10,000,000   10,000,000    
Line of credit, liquidity amount that must be excess availability   $ 5,000,000   $ 5,000,000    
Line of credit facility, fixed charge coverage ratio   1.2   1.2    
Line of credit facility, fixed charge coverage ratio, period when covenant is applied       12 months    
Amount of borrowings, if exceeded, increase the filing of compliance certificates to monthly rather than quarterly   $ 5,000,000.0   $ 5,000,000.0    
Line of credit facility, amount of liquidity required to avoid audits   20,000,000.0   20,000,000.0    
Wells Fargo Credit Agreement | Letter of Credit            
Debt Instrument [Line Items]            
Line of credit facility, letters of credit outstanding   $ 1,000,000   $ 1,000,000    
3.50% convertible subordinated notes            
Debt Instrument [Line Items]            
Aggregate principal of repurchased senior notes $ 81,000,000         $ 2,800,000
Interest rate, per annum on the principal amount   3.50% 3.50% 3.50% 3.50%  
Repurchase amount of repurchased senior notes 82,400,000          
Payment of accrued interest on repurchased senior notes 1,100,000          
Loss on debt extinguishment 400,000          
Extinguishment of debt, loss on notes repurchased 300,000          
Write off of unamortized debt issuance costs 100,000          
Repayments of convertible subordinated debt 66,100,000          
3.50% convertible subordinated notes | Cash            
Debt Instrument [Line Items]            
Repayments of convertible subordinated debt $ 16,300,000