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 $8,036 and $4,375 for the six months ended June 30, 2015 and 2016 respectively		$ 9		18,021			18,030
Share-based compensation arrangements (in shares)		953,721
Foreign currency translation adjustment						(1,177)	(1,177)
Net income					4,852		4,852
Balance at Jun. 30, 2015		$ 822	(28,414)	974,167	(1,630,425)	(2,459)	(686,309)
Balance (in shares) at Jun. 30, 2015	8,624	80,115,538
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 $8,036 and $4,375 for the six months ended June 30, 2015 and 2016 respectively		$ 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