Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Employee Stock Loan Receivable [Member]	Restricted Stock Units [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]
Balance at Dec. 31, 2012	$ 239,864	$ 12	$ 402,668	$ (307)	$ 25,235	$ (1,094)	$ (186,650)
Balance, Shares at Dec. 31, 2012		12,224,000
Net (loss) income	92,912	$ 0	0	0	0	0	92,912
Issuance of common stock, net of forfeitures	5,317	$ 1	18,697	307	(13,688)	0	0
Issuance of common stock, net of forfeitures, shares		957,000
Repurchase of common stock	$ (55,541)	$ (2)	(55,539)	0	0	0	0
Repurchase of common stock, shares	(2,377,583)	(2,378,000)
Repurchase of common stock for employee tax withholding	$ (3,817)	$ 0	(3,817)	0	0	0	0
Repurchase of common stock for employee tax withholding, shares		(258,000)
Stock compensation expense for options granted to purchase common stock	974	$ 0	974	0	0	0	0
Issuance of restricted stock units	9,940	0	0	0	9,940	0	0
Change in unrealized gain (loss) on available-for-sale investment securities, net of taxes	1,128	0	0	0	0	1,128	0
Balance at Dec. 31, 2013	290,777	$ 11	362,983	0	21,487	34	(93,738)
Balance, Shares at Dec. 31, 2013		10,545,000
Net (loss) income	17,019	$ 0	0	0	0	0	17,019
Issuance of common stock, net of forfeitures	2,347	$ 0	5,447	0	(3,100)	0	0
Issuance of common stock, net of forfeitures, shares		295,000
Repurchase of common stock	$ (64,094)	$ (3)	(64,091)	0	0	0	0
Repurchase of common stock, shares	(2,380,504)	(2,380,000)
Repurchase of common stock for employee tax withholding	$ (1,823)	$ 0	(1,823)	0	0	0	0
Repurchase of common stock for employee tax withholding, shares		(71,000)
Stock compensation expense for options granted to purchase common stock	204	$ 0	204	0	0	0	0
Issuance of restricted stock units	15,966	0	0	0	15,966	0	0
Change in unrealized gain (loss) on available-for-sale investment securities, net of taxes	10	0	0	0	0	10	0
Balance at Dec. 31, 2014	260,406	$ 8	302,720	0	34,353	44	(76,719)
Balance, Shares at Dec. 31, 2014		10,545,000
Net (loss) income	(7,461)	$ 0	0	0	0	0	(7,461)
Common stock dividends	(3,710)	0	(3,710)	0	0	0	0
Issuance of common stock, net of forfeitures	2,468	$ 1	8,147	0	(5,680)	0	0
Issuance of common stock, net of forfeitures, shares		494,000
Repurchase of common stock	$ (45,219)	$ (2)	(45,217)	0	0	0	0
Repurchase of common stock, shares	(1,949,517)	(1,950,000)
Repurchase of common stock for employee tax withholding	$ (3,113)	$ 0	(3,113)	0	0	0	0
Repurchase of common stock for employee tax withholding, shares		(138,000)
Stock compensation expense for options granted to purchase common stock	184	$ 0	184	0	0	0	0
Issuance of restricted stock units	7,256	0	0	0	7,256	0	0
Change in unrealized gain (loss) on available-for-sale investment securities, net of taxes	(44)	0	0	0	0	(44)	0
Balance at Dec. 31, 2015	$ 210,767	$ 7	$ 259,011	$ 0	$ 35,929	$ 0	$ (84,180)
Balance, Shares at Dec. 31, 2015		6,795,000