Consolidated Statements of Stockholders' 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
Beginning balance (in shares) at Dec. 31, 2018			21,743,498
Beginning balance at Dec. 31, 2018	$ 1,425,224		$ 217	$ 1,306,653	$ 118,322		$ 32
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Stock-based compensation	12,116			12,033	83
Exercise of stock options, net (in shares)			103,364
Exercise of stock options, net	(1,773)		$ 2	(1,775)
Issuance of restricted stock, net (in shares)			117,947
Issuance of restricted stock, net	(7,472)		$ 1	(7,473)
Common stock dividends	(46,724)				(46,724)
Foreign currency translation adjustments	0
Unrealized gains (losses) on marketable securities, net of tax	201						201
Net income	81,138				81,138
Ending balance (in shares) at Dec. 31, 2019			21,964,809
Ending balance at Dec. 31, 2019	$ 1,462,710	$ (3,311)	$ 220	1,309,438	152,819	$ (3,311)	233
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2016-13 [Member]
Issuance of common stock in public offering (in shares)			2,185,000
Issuance of common stock in public offering	$ 220,248		$ 22	220,226
Stock-based compensation	14,610			14,593	17
Exercise of stock options, net (in shares)			20,522
Exercise of stock options, net	1,244			1,244
Issuance of restricted stock, net (in shares)			250,377
Issuance of restricted stock, net	(25,845)		$ 2	(25,847)
Repurchase of common stock (in shares)			(1,769)
Repurchase of common stock	(247)			(105)	(142)
Common stock dividends	(56,005)				(56,005)
Foreign currency translation adjustments	48,068						48,068
Unrealized gains (losses) on marketable securities, net of tax	579						579
Net income	86,268				86,268
Ending balance (in shares) at Dec. 31, 2020			24,418,939
Ending balance at Dec. 31, 2020	1,748,319		$ 244	1,519,549	179,646		48,880
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Stock-based compensation	18,149			18,094	55
Exercise of stock options, net (in shares)			1,632
Exercise of stock options, net	113			113
Issuance of restricted stock, net (in shares)			248,496
Issuance of restricted stock, net	(2,994)		$ 3	(2,997)
Repurchase of common stock (in shares)			(76,969)
Repurchase of common stock	(5,905)		$ (1)	(4,790)	(1,114)
Common stock dividends	(59,102)				(59,102)
Foreign currency translation adjustments	(39,392)						(39,392)
Unrealized gains (losses) on marketable securities, net of tax	(285)						(285)
Net income	55,087				55,087
Ending balance (in shares) at Dec. 31, 2021			24,592,098
Ending balance at Dec. 31, 2021	$ 1,713,990		$ 246	$ 1,529,969	$ 174,572		$ 9,203