UNAUDITED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Additional Paid-In Capital	Accumulated Other Comprehensive Income	Retained Earnings	Non-controlling Interest	Common Class A	Common Class A Common Stock	Common Class B	Common Class B Common Stock
Beginning Balance at Dec. 31, 2020	$ 108,955	$ 5,190	$ 132	$ 25,611	$ 77,849		$ 173
Beginning Balance (in shares) at Dec. 31, 2020							17,328,899		54,313,620
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amortization of Non-Cash Compensation	2,145	462			1,683
Amortization of Non-Cash Compensation (in shares)							14,201		320,495
Issuance of Shares under Equity Incentive Plan	3,822	872			2,950
Issuance of Shares under Equity Incentive Plan (in shares)							12,353		805,987
Sale of Shares under Equity Incentive Plan	167	36			131
Sale of Shares under Equity Incentive Plan (in shares)									26,097
Directors' Share Grants	247	53			194
Directors' Share Grants (in shares)							12,338
Net Income	25,029			4,187	20,842
Foreign Currency Translation Adjustments	(12)		(5)		(7)
Repurchase and Retirement of Class A Common Stock	(2,390)	(516)			(1,871)		$ (3)
Repurchase and Retirement Shares/Units (in shares)							(275,218)		(18,476)
Repurchase and Retirement of Class B Units	(90)	(20)			(70)
Class A Cash Dividends Declared and Paid	(4,302)			(4,302)
Tax Impact of Transactions with Non-Controlling Shareholders	(494)	(494)
Contributions from Non-Controlling Interests	303				303
Distributions to Non-Controlling Interests	(29,725)				(29,725)
Other		(541)			541
Ending Balance at Mar. 31, 2021	103,655	5,042	127	25,496	72,820		$ 170
Ending Balance (in shares) at Mar. 31, 2021							17,092,573		55,447,723
Beginning Balance at Dec. 31, 2020	108,955	5,190	132	25,611	77,849		$ 173
Beginning Balance (in shares) at Dec. 31, 2020							17,328,899		54,313,620
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Unit Conversion	265
Sale of Shares under Equity Incentive Plan (in shares)								38,876
Net Income	80,809
Repurchase and Retirement Shares/Units (in shares)						(606,805)		(21,266)
Ending Balance at Sep. 30, 2021	149,090	4,751	47	34,123	109,994		$ 175
Ending Balance (in shares) at Sep. 30, 2021							17,523,522		54,704,177
Beginning Balance at Mar. 31, 2021	103,655	5,042	127	25,496	72,820		$ 170
Beginning Balance (in shares) at Mar. 31, 2021							17,092,573		55,447,723
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Unit Conversion	265	1,326			(1,069)		$ 8
Unit Conversion (in shares)							760,000		(760,000)
Amortization of Non-Cash Compensation	2,215	479			1,736
Sale of Shares under Equity Incentive Plan	55	12			43
Sale of Shares under Equity Incentive Plan (in shares)									7,882
Directors' Share Grants	139	30			109
Directors' Share Grants (in shares)							1,268
Net Income	27,077			4,603	22,474
Foreign Currency Translation Adjustments	(117)		(13)		(104)
Options Exercised									6,465
Repurchase and Retirement of Class A Common Stock	(1,047)	(227)			(819)		$ (1)
Repurchase and Retirement Shares/Units (in shares)							(97,656)		(2,790)
Repurchase and Retirement of Class B Units	(32)	(7)			(25)
Class A Cash Dividends Declared and Paid	(513)			(513)
Tax Impact of Transactions with Non-Controlling Shareholders	(132)	(132)
Contributions from Non-Controlling Interests	13,835				13,835
Distributions to Non-Controlling Interests	(13,931)				(13,931)
Other		(890)			890
Ending Balance at Jun. 30, 2021	131,469	5,633	114	29,586	95,959		$ 177
Ending Balance (in shares) at Jun. 30, 2021							17,756,185		54,699,280
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amortization of Non-Cash Compensation	2,329	517			1,812
Sale of Shares under Equity Incentive Plan	33	7			26
Sale of Shares under Equity Incentive Plan (in shares)								4,897	4,897
Directors' Share Grants	130	29			101
Directors' Share Grants (in shares)							1,268
Net Income	28,703			5,068	23,635
Foreign Currency Translation Adjustments	(659)		(67)		(592)
Repurchase and Retirement of Class A Common Stock	(2,527)	(561)			(1,964)		$ (2)
Repurchase and Retirement Shares/Units (in shares)							(233,931)
Class A Cash Dividends Declared and Paid	(531)			(531)
Tax Impact of Transactions with Non-Controlling Shareholders	(394)	(394)
Contributions from Non-Controlling Interests	9,589				9,589
Distributions to Non-Controlling Interests	(19,052)				(19,052)
Other		(480)			480
Ending Balance at Sep. 30, 2021	149,090	4,751	47	34,123	109,994		$ 175
Ending Balance (in shares) at Sep. 30, 2021							17,523,522		54,704,177
Beginning Balance at Dec. 31, 2021	178,054	3,989	7	38,420	135,466		$ 172
Beginning Balance (in shares) at Dec. 31, 2021						17,306,455	17,306,455	54,203,277	55,203,277
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amortization of Non-Cash Compensation	2,079	431			1,648
Amortization of Non-Cash Compensation (in shares)							15,539		310,369
Issuance of Shares under Equity Incentive Plan	6,787	1,528			5,259
Issuance of Shares under Equity Incentive Plan (in shares)									1,084,675
Sale of Shares under Equity Incentive Plan	729	151			578
Sale of Shares under Equity Incentive Plan (in shares)							18,057		138,238
Directors' Share Grants	436	91			345
Directors' Share Grants (in shares)							29,713
Net Income	18,482			2,815	15,667
Foreign Currency Translation Adjustments	(134)		(2)		(132)
Repurchase and Retirement of Class A Common Stock	(2,365)	(491)			(1,873)		$ (1)
Repurchase and Retirement Shares/Units (in shares)							(263,362)		(9,819)
Repurchase and Retirement of Class B Units	(64)	(13)			(51)
Class A Cash Dividends Declared and Paid	(9,209)			(9,209)
Tax Impact of Transactions with Non-Controlling Shareholders	(829)	(829)
Effect of Deconsolidation	(26,755)				(26,755)
Contributions from Non-Controlling Interests	11,838				11,838
Distributions to Non-Controlling Interests	(47,005)				(47,005)
Other		254			(254)
Ending Balance at Mar. 31, 2022	132,044	5,111	5	32,026	94,731		$ 171
Ending Balance (in shares) at Mar. 31, 2022							17,106,402		56,726,740
Beginning Balance at Dec. 31, 2021	178,054	3,989	7	38,420	135,466		$ 172
Beginning Balance (in shares) at Dec. 31, 2021						17,306,455	17,306,455	54,203,277	55,203,277
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Sale of Shares under Equity Incentive Plan (in shares)								381,201
Net Income	48,709
Repurchase and Retirement Shares/Units (in shares)						(686,313)		(9,819)
Ending Balance at Sep. 30, 2022	134,196	3,914	(271)	36,235	94,152		$ 166
Ending Balance (in shares) at Sep. 30, 2022						16,695,440	16,695,440	56,969,703	56,969,703
Beginning Balance at Mar. 31, 2022	132,044	5,111	5	32,026	94,731		$ 171
Beginning Balance (in shares) at Mar. 31, 2022							17,106,402		56,726,740
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amortization of Non-Cash Compensation	2,080	423			1,657
Sale of Shares under Equity Incentive Plan	1,043	223			820
Sale of Shares under Equity Incentive Plan (in shares)							9,483		242,963
Directors' Share Grants	$ 132	27			105
Directors' Share Grants (in shares)	1,253
Net Income	$ 14,439			2,523	11,916
Foreign Currency Translation Adjustments	(875)		(193)		(682)
Repurchase and Retirement of Class A Common Stock	(2,761)	(562)			(2,195)		$ (4)
Repurchase and Retirement Shares/Units (in shares)							(394,957)
Class A Cash Dividends Declared and Paid	(509)			(509)
Tax Impact of Transactions with Non-Controlling Shareholders	(1,085)	(1,085)
Effect of Deconsolidation	(7,182)				(7,182)
Contributions from Non-Controlling Interests	12,592				12,592
Distributions to Non-Controlling Interests	(11,961)				(11,961)
Other		(749)			749
Ending Balance at Jun. 30, 2022	137,957	3,388	(188)	34,040	100,550		$ 167
Ending Balance (in shares) at Jun. 30, 2022							16,722,181		56,969,703
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amortization of Non-Cash Compensation	2,080	418			1,662
Sale of Shares under Equity Incentive Plan (in shares)								0
Directors' Share Grants	131	26			105
Directors' Share Grants (in shares)							1,253
Net Income	15,788			2,697	13,091
Foreign Currency Translation Adjustments	(394)		(83)		(311)
Repurchase and Retirement of Class A Common Stock	(189)	(38)			(150)		$ (1)
Repurchase and Retirement Shares/Units (in shares)							(27,994)
Class A Cash Dividends Declared and Paid	(502)			(502)
Tax Impact of Transactions with Non-Controlling Shareholders	697	697
Effect of Deconsolidation	(11,659)				(11,659)
Contributions from Non-Controlling Interests	3,261				3,261
Distributions to Non-Controlling Interests	(12,974)				(12,974)
Other		(577)			577
Ending Balance at Sep. 30, 2022	$ 134,196	$ 3,914	$ (271)	$ 36,235	$ 94,152		$ 166
Ending Balance (in shares) at Sep. 30, 2022						16,695,440	16,695,440	56,969,703	56,969,703