Condensed Consolidated Statement of Changes in Shareholders' Deficit - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock Outstanding	Additional Paid-In Capital	Retained Deficit	Treasury Stock
Beginning Balances at Dec. 31, 2017	$ (573,508)	$ 1	$ 545,820	$ (1,095,162)	$ (24,167)
Beginning Balances (in shares) at Dec. 31, 2017		139,091			2,869
Share-based compensation	1,219		1,219
Net income (loss)	27,640			27,640
Ending Balances at Mar. 31, 2018	(544,649)	$ 1	547,039	(1,067,522)	$ (24,167)
Ending Balances (in shares) at Mar. 31, 2018		139,091			2,869
Beginning Balances at Dec. 31, 2018	(324,796)	$ 1	545,705	(846,335)	$ (24,167)
Beginning Balances (in shares) at Dec. 31, 2018		140,644			2,869
Share-based compensation	(78)		(78)
Net income (loss)	(47,761)			(47,761)
Ending Balances at Mar. 31, 2019	$ (372,635)	$ 1	$ 545,627	$ (894,096)	$ (24,167)
Ending Balances (in shares) at Mar. 31, 2019		140,644			2,869