Condensed Consolidated Statements of Changes in Shareholders' Deficit - USD ($) $ in Thousands	Preferred Stock	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained (Deficit) Earnings	Accumulated Other Comprehensive (Loss) Income	Total
Balance at Dec. 31, 2015		$ 830	$ (28,414)	$ 988,686	$ (1,634,591)	$ (4,554)	$ (678,043)
Balance (in shares) at Dec. 31, 2015	8,624	80,889,275
Increase (Decrease) in Shareholders' Deficit
Share-based compensation arrangements, net of tax benefits of $4,375 for the period ended June 30, 2016		$ 7		12,097			12,104
Share-based compensation arrangements (in shares)		730,483
Foreign currency translation adjustment						1,272	1,272
Conversion of preferred stock		$ 12		(12)
Conversion of preferred stock (in shares)	(1,177)	1,177,000
Net income					57,743		57,743
Balance at Jun. 30, 2016		$ 849	(28,414)	1,000,771	(1,576,848)	(3,282)	(606,924)
Balance (in shares) at Jun. 30, 2016	7,447	82,796,758
Balance at Dec. 31, 2016		$ 932	(28,414)	1,014,119	(1,525,281)	(4,676)	(543,320)
Balance (in shares) at Dec. 31, 2016		91,122,308
Increase (Decrease) in Shareholders' Deficit
Repurchase of Preferred Stock		$ (4)		(5,790)			(5,794)
Repurchase of Preferred Stock (in shares)		(416,886)
Share-based compensation arrangements, net of tax benefits of $4,375 for the period ended June 30, 2016		$ 6		7,746			7,752
Share-based compensation arrangements (in shares)		634,245
Foreign currency translation adjustment						1,654	1,654
Net income					22,183		22,183
Balance at Jun. 30, 2017		$ 934	$ (28,414)	$ 1,016,075	$ (1,503,098)	$ (3,022)	$ (517,525)
Balance (in shares) at Jun. 30, 2017		91,339,667