CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock.	Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income / (Loss)	Total
Balance at Dec. 31, 2015	$ 827	$ 1,509,688	$ (163,421)	$ 667	$ 1,347,761
Increase (Decrease) in Shareholders' Equity
Net Income			60,858		60,858
Foreign currency translation adjustments				63	63
Stock-based compensation		1,428			1,428
Balance at Mar. 31, 2016	827	1,511,116	(102,563)	730	1,410,110
Balance at Dec. 31, 2016	830	1,515,362	(96,115)	17,334	1,437,411
Increase (Decrease) in Shareholders' Equity
Net Income			26,864		26,864
Gain recognized in other comprehensive income on derivative				196	196
Loss recognized in net income on derivative				827	827
Stock-based compensation		2,077			2,077
Balance at Mar. 31, 2017	$ 830	$ 1,517,439	$ (69,251)	$ 18,357	$ 1,467,375