Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-In Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2017	$ 174,956	$ 1,981	$ 678		$ 186,117	$ 1,981	$ (11,839)
Balance (in shares) at Dec. 31, 2017			67,776,138
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201409Member
Repurchase of common stock	$ (149,322)		$ (33)	$ (19,860)	(129,429)
Repurchase of common stock (in shares)			(3,262,835)
Restricted stock units issuance			$ 4	(4)
Restricted stock units issuance (in shares)			347,116
Equity-based compensation	19,864			19,864
Foreign currency translation adjustment	(5,022)						(5,022)
Net income	104,690				104,690
Balance at Dec. 31, 2018	$ 147,147		$ 649		163,359		(16,861)
Balance (in shares) at Dec. 31, 2018			64,860,419
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201409Member
Repurchase of common stock	$ (121,487)		$ (18)	(31,837)	(89,631)
Repurchase of common stock (in shares)			(1,751,507)
Restricted stock units issuance			$ 4	(4)
Restricted stock units issuance (in shares)			348,074
Equity-based compensation	31,841			31,841
Foreign currency translation adjustment	(985)						(985)
Net income	85,762				85,762
Balance at Dec. 31, 2019	142,278		$ 635		159,490		(17,847)
Balance (in shares) at Dec. 31, 2019			63,456,986
Repurchase of common stock	(43,561)		$ (6)	(33,349)	(10,206)
Repurchase of common stock (in shares)			(562,299)
Restricted stock units issuance			$ 6	(6)
Restricted stock units issuance (in shares)			632,499
Equity-based compensation	33,355			$ 33,355
Foreign currency translation adjustment	(415)						(415)
Net income	87,240				87,240
Balance at Dec. 31, 2020	$ 218,897		$ 635		$ 236,524		$ (18,262)
Balance (in shares) at Dec. 31, 2020			63,527,186