Net Income (Loss) Per Share (Details 1) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
NET INCOME (LOSS) ATTRIBUTABLE TO THE COMPANY’S COMMON STOCKHOLDERS	$ 32,956	$ (34,809)	$ 241,983	$ (50,723)
Less: effect of participating securities	0	0	0	0
Net income (loss) attributable to common stockholders - Dilutive	$ 32,956	$ (34,809)	$ 241,983	$ (50,723)
Shares:
Weighted-average shares used to compute basic net income per share (in shares)	37,413,387	38,679,849	38,112,531	38,639,672
Adjustment to reflect conversion of convertible notes (in shares)	4,333,570	0	2,377,998	0
Adjustment to reflect stock appreciation right conversions (in shares)	332,987	0	222,585	0
Weighted-average shares used to compute diluted net income per share (in shares)	42,079,944	38,679,849	40,713,114	38,639,672
Net income (loss) per share attributable to common stockholders:
Diluted (in dollars per share)	$ 0.78	$ (0.90)	$ 5.94	$ (1.31)