Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Common Stock [Member]
Shares, Outstanding				38,661,850
Stockholders' Equity Attributable to Parent	$ 274,950	$ 372,990	$ (98,427)	$ 387
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2014-09 [Member]	(3,494)		(3,494)
Stock Granted, Value, Share-based Compensation, Net of Forfeitures	1,170	1,170
Shares Paid for Tax Withholding for Share Based Compensation				(8,466)
Adjustments Related to Tax Withholding for Share-based Compensation	(79)	(79)
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited And Expirations In Period				(44,574)
Net income	7,581
Shares, Outstanding				38,636,038
Stockholders' Equity Attributable to Parent	274,517	373,522	(99,392)	$ 387
Stock Granted, Value, Share-based Compensation, Net of Forfeitures	638
Shares Paid for Tax Withholding for Share Based Compensation				(8,466)
Adjustments Related to Tax Withholding for Share-based Compensation	(79)	(79)
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited And Expirations In Period				(18,762)
Net income	5,052		5,052
Shares, Outstanding				38,608,810
Stockholders' Equity Attributable to Parent	280,128	374,081	(94,340)	$ 387
Shares, Outstanding				39,009,451
Stockholders' Equity Attributable to Parent	265,236	375,734	(110,888)	$ 390
Stock Granted, Value, Share-based Compensation, Net of Forfeitures	$ 1,129
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited And Expirations In Period				301,371
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures		(3)		$ 3
Stock Issued During Period, Value, Stock Options Exercised	(6,709)			6,709.000
Stock Issued During Period, Value, Stock Options Exercised	$ 80	80
Shares Paid for Tax Withholding for Share Based Compensation				(25,747)
Adjustments Related to Tax Withholding for Share-based Compensation	$ (295)	(294)		$ (1)
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited And Expirations In Period	44,722
Treasury Stock, Shares, Acquired				(1,558,836)
Treasury Stock, Value, Acquired, Cost Method	$ (18,326)	(18,311)		$ (15)
Net income	15,000		15,000
Shares, Outstanding				38,730,204
Stockholders' Equity Attributable to Parent	263,238	372,825	(109,975)	$ 388
Stock Granted, Value, Share-based Compensation, Net of Forfeitures	641
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited And Expirations In Period				323,489
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures		(3)		$ 3
Stock Issued During Period, Value, Stock Options Exercised				6,709
Stock Issued During Period, Value, Stock Options Exercised	80	80
Shares Paid for Tax Withholding for Share Based Compensation				(24,172)
Adjustments Related to Tax Withholding for Share-based Compensation	(279)	278		$ 1
Treasury Stock, Shares, Acquired				(1,303,282)
Treasury Stock, Value, Acquired, Cost Method	(14,943)	14,930		$ 13
Net income	14,087		14,087
Shares, Outstanding				37,732,948
Stockholders' Equity Attributable to Parent	$ 262,824	$ 358,335	$ (95,888)	$ 377