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, 2014		$ 813	$ (28,414)	$ 956,146	$ (1,635,277)	$ (1,282)	$ (708,014)
Balance (in shares) at Dec. 31, 2014	8,624	79,161,817
Increase (Decrease) in Shareholders' Equity
Share-based compensation arrangements, net of tax benefits of $10,143 and $8,510 for the nine months ended September 30, 2015 and 2016 respectively		$ 13		24,711			24,724
Share-based compensation arrangements (in shares)		1,353,264
Foreign currency translation adjustment						(2,664)	(2,664)
Net income					9,752		9,752
Balance at Sep. 30, 2015		$ 826	(28,414)	980,857	(1,625,525)	(3,946)	(676,202)
Balance (in shares) at Sep. 30, 2015	8,624	80,515,081
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' Equity
Share-based compensation arrangements, net of tax benefits of $10,143 and $8,510 for the nine months ended September 30, 2015 and 2016 respectively		$ 8		18,835			18,843
Share-based compensation arrangements (in shares)		859,560
Foreign currency translation adjustment						1,060	$ 1,060
Conversion of preferred stock		$ 17		(17)
Conversion of preferred stock (in shares)	(1,693)	1,693,000					1,693,000
Net income					104,278		$ 104,278
Balance at Sep. 30, 2016		$ 855	$ (28,414)	$ 1,007,504	$ (1,530,313)	$ (3,494)	$ (553,862)
Balance (in shares) at Sep. 30, 2016	6,931	83,441,835