Stockholders' Equity - Schedule of Changes in Stockholders' Equity (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Balance	$ 746,961	$ 714,551
Net income	18,351	10,612
Other comprehensive income (loss)	2,780	(11,123)
Equity compensation	3,275	3,826
Exercise of stock options	87	37
Net payments for stock issuances and buybacks	(17,580)	(23,998)
Dividends declared	(2,641)	(2,636)
Balance	$ 751,233	690,756
Cumulative-Effect Adjustments for Adoption of Accounting Principle | Revision of Prior Period, Adjustment
Balance		$ (513)
Accounting Standards Update Extensible List		us-gaap:AccountingStandardsUpdate201613Member
Common Stock
Balance (in shares)	18,910	18,868
Balance	$ 23	$ 23
Exercise of stock options (in shares)	3	1
Issuance of shares pursuant to vesting of restricted stock units (in shares)	153	269
Net payments for stock issuances and buybacks (in shares)	(207)	(311)
Balance (in shares)	18,859	18,827
Balance	$ 23	$ 23
Additional Paid-in Capital
Balance	369,058	346,795
Equity compensation	3,275	3,826
Exercise of stock options	87	37
Balance	372,420	350,658
Retained Earnings
Balance	588,731	544,840
Net income	18,351	10,612
Dividends declared	(2,641)	(2,636)
Balance	$ 604,441	552,303
Retained Earnings | Cumulative-Effect Adjustments for Adoption of Accounting Principle | Revision of Prior Period, Adjustment
Balance		$ (513)
Accounting Standards Update Extensible List		us-gaap:AccountingStandardsUpdate201613Member
Treasury Stock
Balance (in shares)	4,395	3,978
Balance	$ (196,745)	$ (164,963)
Net payments for stock issuances and buybacks (in shares)	207	311
Net payments for stock issuances and buybacks	$ (17,580)	$ (23,998)
Balance (in shares)	4,602	4,289
Balance	$ (214,325)	$ (188,961)
Accumulated Other Comprehensive Loss
Balance	(14,106)	(12,144)
Other comprehensive income (loss)	2,780	(11,123)
Balance	$ (11,326)	$ (23,267)