Annual report pursuant to Section 13 and 15(d)

NET INCOME (LOSS) PER SHARE - Narrative (Details)

v3.7.0.1
NET INCOME (LOSS) PER SHARE - Narrative (Details) - $ / shares
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2015
Dec. 31, 2012
4.50% convertible subordinated notes        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stated interest rate (as a percent) 4.50% 4.50%   4.50%
Conversion price (usd per share) $ 13.2   $ 34.64 $ 13.20
3.50% convertible subordinated notes        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stated interest rate (as a percent) 3.50%   3.50%