CONDENSED CONSOLIDATED STATEMENTS OF EQUITY UNAUDITED - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Deficit) [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2015	$ 33	$ 345	$ (34,224)	$ 9,115	$ (251,596)	$ (276,327)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	84,429	0	0	84,429
Net unrealized gain on securities available for sale, net of income tax expense	0	0	0	221	0	221
Amounts reclassified from accumulated other comprehensive income, net of income tax expense (benefit)	0	0	0	102	0	102
Foreign currency translation	0	0	0	(121)	0	(121)
Dividends declared	0	0	(1,793)	0	0	(1,793)
Stock based compensation expense	0	3,258	0	0	0	3,258
Reduction of deferred tax asset for excess of recorded RSA tax benefit over actual tax benefit	0	(468)	0	0	0	(468)
Purchase of treasury stock	0	0	0	0	(8,384)	(8,384)
Balance at Sep. 30, 2016	33	3,135	48,412	9,317	(259,980)	(199,083)
Balance at Dec. 31, 2016	33	3,903	80,515	11,271	(262,369)	(166,647)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	64,314	0	0	64,314
Net unrealized gain on securities available for sale, net of income tax expense	0	0	0	2,830	0	2,830
Amounts reclassified from accumulated other comprehensive income, net of income tax expense (benefit)	0	0	0	(1,811)	0	(1,811)
Foreign currency translation	0	0	0	75	0	75
Dividends declared	0	0	(1,803)	0	0	(1,803)
Stock based compensation expense	0	7,181	0	0	0	7,181
Purchase of treasury stock	0	0	0	0	(8,626)	(8,626)
Balance at Sep. 30, 2017	$ 33	$ 11,084	$ 143,026	$ 12,365	$ (270,995)	$ (104,487)