CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Retained Earnings Adjustment	Retained Earnings	Accumulated Other Comprehensive Loss. Adjustment	Accumulated Other Comprehensive Loss.	Treasury Stock	Non-controlling Interest	Adjustment	Total
Beginning Balance (in shares) at Dec. 31, 2017	65,897,866
Beginning Balance (ASU 2014-09) at Dec. 31, 2017		$ 1,140						$ 1,140
Beginning Balance (ASU 2016-01) at Dec. 31, 2017		(696)		$ 696
Beginning Balance at Dec. 31, 2017	$ 424,694		$ 154,324		$ (1,461)		$ 15,027		$ 592,584
Increase (Decrease) in Stockholders' Equity
Allocation of ownership interest	(490)						490
Additional ownership interest	297						(297)
Capital contribution from non-controlling interest							887		887
Capital distribution to non-controlling interest							(400)		(400)
Stock based compensation expense	$ 71								71
Stock based compensation expense (in shares)	2,778
Issuance of common stock for officer compensation, net of tax withholding	$ 192								192
Issuance of common stock for officer compensation, net of tax withholding	9,956
Repurchase of common shares						$ (93,369)			(93,369)
Repurchase of common shares (in shares)	(5,238,566)
Retirement of treasury stock	$ (93,369)					93,369
Adoption of ASU 2018-02 Income Statement - Reporting Comprehensive Income			313		(313)
Other comprehensive income (loss), net of tax									787
Other comprehensive (loss) income, net of tax, excluding adoption of ASUs - 2018					404				404
Net income			32,369				(767)		31,602
Ending Balance at Dec. 31, 2018	$ 331,395		187,450		(674)		14,940		533,111
Ending Balance (in shares) at Dec. 31, 2018	60,672,034
Increase (Decrease) in Stockholders' Equity
Allocation of ownership interest	$ (1,209)						1,209
Additional ownership interest	(3,787)						(7,832)		(11,619)
Capital contribution from non-controlling interest							2,546		2,546
Capital distribution to non-controlling interest							(600)		(600)
Stock based compensation expense	$ 77								77
Stock based compensation expense (in shares)	5,708
Repurchase of common shares						(20,845)			(20,845)
Repurchase of common shares (in shares)	(1,263,159)
Retirement of treasury stock	$ (20,845)					20,845
Other comprehensive income (loss), net of tax					339				339
Net income			26,775				(114)		26,661
Ending Balance at Dec. 31, 2019	$ 305,631	$ (90)	214,225		(335)		10,149	$ (90)	$ 529,670
Ending Balance (in shares) at Dec. 31, 2019	59,414,583								59,414,583
Increase (Decrease) in Stockholders' Equity
Capital contribution from non-controlling interest							7,748		$ 7,748
Capital distribution to non-controlling interest							(621)		(621)
Stock based compensation expense	$ 45								45
Repurchase of common shares						(8,803)			(8,803)
Repurchase of common shares (in shares)	(532,034)
Retirement of treasury stock	$ (8,803)					$ 8,803
Dividends ($0.07 per share)			(4,122)						(4,122)
Other comprehensive income (loss), net of tax					(1,137)				(1,137)
Net income			45,203				277		45,480
Ending Balance at Dec. 31, 2020	$ 296,873		$ 255,216		$ (1,472)		$ 17,553		$ 568,170
Ending Balance (in shares) at Dec. 31, 2020	58,882,549								58,882,549