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DEBT (Details 3) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Amortization of debt discount     $ 4,362 $ 2,044
Capitalized interest (Note 4) $ (200) $ (400) $ (400) $ (700)
Effective interest rate on convertible senior notes 7.81% 7.22% 7.70% 7.22%
Two Thousand Nineteen Senior Convertible Notes [Member]        
Contractual interest expense $ 2,053 $ 963 $ 3,242 $ 1,926
Amortization of debt issuance costs 389 153 590 306
Amortization of debt discount 2,951 1,022 4,362 2,044
Capitalized interest (Note 4) (167) (405) (379) (675)
Total $ 5,226 $ 1,733 $ 7,815 $ 3,601