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DEBT (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Interest Expense, Debt [Abstract]      
Amortization of debt discount $ 12,799 $ 10,423 $ 4,088
Interest Costs Capitalized (689) (1,101) (1,491)
Notes      
Interest Expense, Debt [Abstract]      
Total interest expense recognized 21,949 18,047 7,061
Convertible Debt [Member]      
Interest Expense, Debt [Abstract]      
Contractual interest expense 8,205 7,344 3,852
Amortization of debt issuance costs 1,634 1,381 612
Amortization of debt discount $ 12,799 $ 10,423 $ 4,088
Effective interest rate (as a percent) 7.81% 7.77% 7.22%