CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Earnings
Beginning balance (in shares) at Dec. 31, 2018		55,847
Beginning balance at Dec. 31, 2018	$ 1,169,756	$ 558	$ 655,415	$ (223,371)	$ 737,154
Increase (Decrease) in Stockholders' Equity
Net income	97,740				97,740
Other comprehensive income (loss)	13,320			13,320
Stock-based compensation	17,816		17,816
Issuance of common stock for restricted share vesting, net of employee tax withholding (in shares)		249
Issuance of common stock for restricted share vesting, net of employee tax withholdings	$ (7,429)	$ 3	(7,432)
Repurchases of common stock (in shares)	(300)	(298)
Repurchases of common stock	$ (21,390)	$ (3)	(21,387)
Ending balance (in shares) at Dec. 31, 2019		55,798
Ending balance at Dec. 31, 2019	1,269,813	$ 558	644,412	(210,051)	834,894
Increase (Decrease) in Stockholders' Equity
Net income	134,837				134,837
Other comprehensive income (loss)	(1,426)			(1,426)
Stock-based compensation	18,502		18,502
Issuance of common stock for restricted share vesting, net of employee tax withholding (in shares)		179
Issuance of common stock for restricted share vesting, net of employee tax withholdings	$ (5,331)	$ 2	(5,333)
Repurchases of common stock (in shares)	(1,200)	(1,204)
Repurchases of common stock	$ (74,844)	$ (12)	(74,832)
Ending balance (in shares) at Dec. 31, 2020		54,773
Ending balance at Dec. 31, 2020	1,341,551	$ 548	582,749	(211,477)	969,731
Increase (Decrease) in Stockholders' Equity
Net income	203,247				203,247
Other comprehensive income (loss)	15,465			15,465
Stock-based compensation	18,839		18,839
Issuance of common stock for restricted share vesting, net of employee tax withholding (in shares)		235
Issuance of common stock for restricted share vesting, net of employee tax withholdings	$ (10,805)	$ 2	(10,807)
Repurchases of common stock (in shares)	(600)	(589)
Repurchases of common stock	$ (54,410)	$ (6)	(54,404)
Ending balance (in shares) at Dec. 31, 2021		54,419
Ending balance at Dec. 31, 2021	$ 1,513,887	$ 544	$ 536,377	$ (196,012)	$ 1,172,978