Consolidated Statements of Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]	Total
Balance (in shares) at Dec. 31, 2018	15,255,002
Balance at Dec. 31, 2018	$ 153	$ 219,435	$ 516,435	$ (2,745)	$ 1,179	$ 734,457
Net income			68,211		(235)	67,976
Distributions attributable to noncontrolling interest	$ 0	0	0	0	(468)	(468)
Other comprehensive income (loss)				5,305		5,305
Stock–based compensation		1,878				$ 1,878
Shares sold – options exercised (in shares)	87,600					346,168
Shares sold – options exercised	$ 0	2,346				$ 2,346
Repurchase of common shares (in shares)	(10,396)
Repurchase of common shares		(872)				(872)
Dividends declared to common stockholders			(31,553)			(31,553)
Balance (in shares) at Dec. 31, 2019	15,332,206
Balance at Dec. 31, 2019	$ 153	222,787	553,093	2,560	476	779,069
Net income			41,871		119	41,990
Other comprehensive income (loss)	$ 0		0	2,497	0	2,497
Stock–based compensation		2,453				$ 2,453
Shares sold – options exercised (in shares)	38,336					43,630
Shares sold – options exercised		1,756				$ 1,756
Repurchase of common shares (in shares)	(797)
Repurchase of common shares	$ 0	(53)	0	0	0	(53)
Dividends declared to common stockholders			(31,940)			(31,940)
Contributions attributable to noncontrolling interest					2,488	2,488
Balance (in shares) at Dec. 31, 2020	15,369,745
Balance at Dec. 31, 2020	$ 153	226,943	563,024	5,057	3,083	798,260
Net income	0	0	138,590	0	497	139,087
Other comprehensive income (loss)				(3,452)		(3,452)
Stock–based compensation	$ 0	2,620	0	0	0	$ 2,620
Shares sold – options exercised (in shares)	90,725					541,736
Shares sold – options exercised	$ 1	3,440	0	0	0	$ 3,441
Repurchase of common shares (in shares)	(8,437)
Repurchase of common shares	$ 0	(836)	0	0	0	(836)
Dividends declared to common stockholders	0	0	(32,536)	0	0	(32,536)
Contributions attributable to noncontrolling interest	$ 0	0	0	0	1,876	1,876
Balance (in shares) at Dec. 31, 2021	15,452,033
Balance at Dec. 31, 2021	$ 154	$ 232,167	$ 669,078	$ 1,605	$ 5,456	$ 908,460