CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME
Net (loss) / Income	$ (168,541)	$ 67,306	$ 129,569
Other comprehensive (loss) income:
Amount recognized in other comprehensive (loss) income on derivative	(152)	14,642
Amount reclassified from AOCI to net (loss) / income on derivative	1,403	2,692
Foreign subsidiaries liquidation		(730)
Foreign currency translation adjustments		63	338
Comprehensive (loss) income	$ (167,290)	$ 83,973	$ 129,907