Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Total	COMMON STOCK, AMOUNT	Additional Paid-in Capital	AOCI Attributable to Parent	Treasury Stock	Retained Earnings	Parent	Noncontrolling Interest
Treasury Stock, Shares					(3,747,210)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Dec. 31, 2018	$ 451,431	$ 18,625	$ 124,395	$ (8,310)	$ (66,392)	$ 380,431	$ 448,749	$ 2,682
Common Stock, Shares, Issued at Dec. 31, 2018		18,625,458
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	12,515					12,396	12,396	119
Other Comprehensive Income (Loss), Net of Tax	9,522			9,522			9,522	0
Treasury Stock, Value, Acquired, Cost Method	$ (4,051)				$ (4,051)		(4,051)	0
Treasury Stock, Shares, Acquired	(108,646)				(108,646)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	$ (3,413)		(1,033)				(1,033)	(2,380)
Dividends, Common Stock, Cash	(5,963)					(5,963)	(5,963)	0
Sharebased Compensation Effect On Stockholders Equity	105		(614)		$ 719		105	0
Sharebased Compensation Effect On Stockholders Equity, Shares Issued					95,339
Distributions to noncontrolling interests	(403)						0	(403)
Other	(31)		(31)				(31)	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Dec. 31, 2019	$ 459,712	$ 18,625	122,717	1,212	$ (69,724)	386,864	459,694	18
Common Stock, Shares, Issued at Dec. 31, 2019	18,625,458	18,625,458
Treasury Stock, Shares	(3,760,517)				(3,760,517)
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	$ 18,909					18,881	18,881	28
Other Comprehensive Income (Loss), Net of Tax	2,985			2,985			2,985	0
Treasury Stock, Value, Acquired, Cost Method	$ (7,534)				$ (7,534)		(7,534)	0
Treasury Stock, Shares, Acquired	(244,487)				(244,487)
Dividends, Common Stock, Cash	$ (6,472)					(6,472)	(6,472)	0
Sharebased Compensation Effect On Stockholders Equity	2,210		2,040		$ 170		2,210	0
Sharebased Compensation Effect On Stockholders Equity, Shares Issued					22,593
Distributions to noncontrolling interests	(4)						0	(4)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Dec. 31, 2020	$ 469,806	$ 18,625	$ 124,757	$ 4,197	$ (77,088)	$ 399,273	$ 469,764	$ 42
Common Stock, Shares, Issued at Dec. 31, 2020	18,625,458	18,625,458
Treasury Stock, Shares	(3,982,411)				(3,982,411)