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DEBT - Components of Interest Expense (Details) - 2016 Convertible Senior Notes - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
2016 Notes:        
Amortization of the discount on the liability component $ 2,132 $ 2,142 $ 6,300 $ 5,874
Cash interest related to the contractual interest coupon 892 885 2,671 2,548
Total 3,024 3,027 8,971 8,422
Amortization of debt discount (premium), interest costs capitalized $ 100 $ 100 200 500
Interest expense, debt, excluding amortization, interest costs capitalized     $ 100 $ 200