CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Common Stock Held in Treasury
Balance at beginning of period (shares) at Dec. 31, 2018		49,276				5,673
Balance at beginning of period (value) at Dec. 31, 2018	$ 1,318,104	$ 493	$ 1,224,608	$ 606,810	$ (113,117)	$ (400,690)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under share-based compensation (value)	0	$ 0	(1,441)			$ 1,441
Shares issued under share-based compensation (shares)		0				(21)
Exercise of stock options, net of shares net-settled (shares)		0				(10)
Exercise of stock options, net of shares net-settled (value)	400	$ 0	(319)			$ 719
Shares issued upon acquisition of American First Finance	0
Share-based compensation expense (value)	8,680		8,680
Net income	164,618			164,618
Dividends paid	(43,952)			(43,952)
Currency translation adjustment	16,148				16,148
Repurchases of treasury stock (shares)						1,305
Repurchases of treasury stock (value)	(113,963)					$ (113,963)
Balance at end of period (shares) at Dec. 31, 2019		49,276				6,947
Balance at end of period (value) at Dec. 31, 2019	1,350,035	$ 493	1,231,528	727,476	(96,969)	$ (512,493)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under share-based compensation (value)	(3,326)	$ 0	(10,663)			$ 7,337
Shares issued under share-based compensation (shares)		0				(98)
Exercise of stock options, net of shares net-settled (shares)						(38)
Exercise of stock options, net of shares net-settled (value)	798		(1,991)			$ 2,789
Shares issued upon acquisition of American First Finance	0
Share-based compensation expense (value)	2,914		2,914
Net income	106,579			106,579
Dividends paid	(44,752)			(44,752)
Currency translation adjustment	(21,463)				(21,463)
Repurchases of treasury stock (shares)						1,427
Repurchases of treasury stock (value)	(106,970)					$ (106,970)
Balance at end of period (shares) at Dec. 31, 2020		49,276				8,238
Balance at end of period (value) at Dec. 31, 2020	$ 1,283,815	$ 493	1,221,788	789,303	(118,432)	$ (609,337)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	46
Shares issued under share-based compensation (value)	$ (1,663)		(7,090)			$ 5,427
Shares issued under share-based compensation (shares)						(73)
Exercise of stock options, net of shares net-settled (shares)						(10)
Exercise of stock options, net of shares net-settled (value)	380		(358)			$ 738
Shares issued upon acquisition of American First Finance	505,546	$ 80	505,466
Shares issued upon acquisition of American First Finance (shares)		8,046
Share-based compensation expense (value)	5,150		5,150
Net income	124,909			124,909
Dividends paid	(47,533)			(47,533)
Currency translation adjustment	(12,867)				(12,867)
Repurchases of treasury stock (shares)						688
Repurchases of treasury stock (value)	(49,610)					$ (49,610)
Balance at end of period (shares) at Dec. 31, 2021		57,322				8,843
Balance at end of period (value) at Dec. 31, 2021	$ 1,808,127	$ 573	$ 1,724,956	$ 866,679	$ (131,299)	$ (652,782)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	28