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DEBT (Details) - USD ($)
shares in Thousands, $ in Thousands
1 Months Ended 6 Months Ended
May 31, 2017
Mar. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]        
Settlement Period - Convertible Debt Conversion Request     40 days  
Debt Conversion, Converted Instrument, Shares Issued 10 2,500    
Convertible Senior Notes Due 2019        
Debt Instrument [Line Items]        
Debt Instrument, Repurchased Face Amount   $ 117,700 $ 500  
Total debt, net of debt discount and deferred financing costs     300  
Debt Instrument, Repurchase Amount   $ 118,200 500  
Unsecured Debt | Convertible Senior Notes Due 2022        
Debt Instrument [Line Items]        
Convertible senior notes, gross     345,000 $ 0
Deferred financing costs     (8,272) 0
Discount on debt     (67,400) 0
Total debt, net of debt discount and deferred financing costs     269,328 0
Unsecured Debt | Convertible Senior Notes Due 2019        
Debt Instrument [Line Items]        
Convertible senior notes, gross     340 118,531
Deferred financing costs     (3) (1,276)
Discount on debt     (18) (8,517)
Total debt, net of debt discount and deferred financing costs     $ 319 $ 108,738