Condensed Consolidated Statements of Changes in Shareholders' (Deficit) Equity - 3 months ended Mar. 31, 2018 - USD ($) $ in Thousands	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Deficit	Accumulated Other Comprehensive Income (Loss)	Total
Balance at Dec. 31, 2017	$ 933	$ (28,414)	$ 1,007,606	$ (1,051,818)	$ (1,453)	$ (73,146)
Balance (in shares) at Dec. 31, 2017	91,225,242
Increase (Decrease) in Shareholders' Deficit
Share-based compensation arrangements	$ 4		3,716			3,720
Share-based compensation arrangements (in shares)	430,048
Cumulative-effect adjustment upon adoption of ASC 606 "Revenue from Contracts with Customers"				(9,650)		(9,650)
Net income				45,437		45,437
Balance at Mar. 31, 2018	$ 937	$ (28,414)	$ 1,011,322	$ (1,016,031)	$ (1,453)	$ (33,639)
Balance (in shares) at Mar. 31, 2018	91,655,290