CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Common Shares in Treasury	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non- controlling Interests
Beginning balances (in shares) at Dec. 31, 2018		10,433,000
Beginning balances at Dec. 31, 2018	$ 385,849	$ (165,545)	$ 93,436	$ 298,123	$ 255,978	$ (105,361)	$ 9,218
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	7,415				6,038		1,377
Other comprehensive income (loss)	$ (4,130)					(4,015)	(115)
Purchase of treasury stock (in shares)	1,440,678	1,441,000
Purchase of treasury stock	$ (25,000)	$ (25,000)
Stock-based compensation transactions (in shares)		(443,000)
Stock-based compensation transactions	6,722	$ 10,302		(3,580)
Distributions to noncontrolling interests	(654)						(654)
Ending balances (in shares) at Dec. 31, 2019		11,431,000
Ending balances at Dec. 31, 2019	370,202	$ (180,243)	93,436	294,543	262,016	(109,376)	9,826
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	44,043				42,799		1,244
Other comprehensive income (loss)	$ 19,564					19,666	(102)
Purchase of treasury stock (in shares)	0
Stock-based compensation transactions (in shares)		(366,000)
Stock-based compensation transactions	$ 7,126	$ 7,987		(861)
Ending balances (in shares) at Dec. 31, 2020		11,065,000
Ending balances at Dec. 31, 2020	440,935	$ (172,256)	93,436	293,682	304,815	(89,710)	10,968
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	150,541				148,831		1,710
Other comprehensive income (loss)	$ (52,133)					(52,062)	(71)
Purchase of treasury stock (in shares)	0
Stock-based compensation transactions (in shares)		(1,253,000)
Stock-based compensation transactions	$ 14,178	$ 26,013		(11,835)
Change in ownership interest	(5,418)			(2,530)			(2,888)
Ending balances (in shares) at Dec. 31, 2021		9,812,000
Ending balances at Dec. 31, 2021	$ 548,103	$ (146,243)	$ 93,436	$ 279,317	$ 453,646	$ (141,772)	$ 9,719