CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 65,948	$ 129,893	$ (92,144)
Other comprehensive income (loss):
Unrealized foreign currency translation adjustments	22	(4,970)	(2,933)
Reclassification of cumulative foreign currency translation adjustments	609	0	0
Changes in fair value of cash flow hedges:
Amortization of loss and loss on termination of cash flow hedges	0	180	3,486
Unrealized gain arising during the period	202	204	883
Total other comprehensive (loss) income	833	(4,586)	1,436
Total comprehensive income (loss)	$ 66,781	$ 125,307	$ (90,708)