CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Treasury	Additional paid-in capital	Retained earnings	Noncontrolling interest non- redeemable	Non controlling interest redeemable
Beginning balance at Dec. 31, 2019	$ 1,507,251	$ 361	$ (60,060)	$ 949,321	$ 523,701	$ 93,928	$ 15,151
Beginning balance (in shares) at Dec. 31, 2019		36,129,280
Beginning balance, Treasury stock (in shares) at Dec. 31, 2019			5,136,890
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	123,746				111,596	12,150	14,187
Net income	137,933
Acquired noncontrolling interest	5,854					5,854	3,508
Purchase of additional controlling interest	(23,913)			(1,709)		(22,204)	(382)
Sale of noncontrolling interest	5,290			(860)		6,150
Noncontrolling interest distributions	(11,294)					(11,294)	(13,543)
Nonvested stock compensation	14,347			14,347
Issuance of vested stock	3	$ 3
Issuance of vested stock (in shares)		195,618
Treasury shares redeemed to pay income tax	$ (9,202)		$ (9,202)
Treasury shares redeemed to pay income tax (in shares)	78,767		71,439
Exercise of stock options (in shares)		16,286	7,328
Repurchase of common stock	$ (905)		$ 251	(1,156)
Issuance of common stock under Employee Stock Purchase Plan (in shares)	14,313	14,313
Issuance of common stock under Employee Stock Purchase Plan	$ 2,177			2,177
Ending balance at Dec. 31, 2020	1,613,354	$ 364	$ (69,011)	962,120	635,297	84,584	18,921
Ending balance (in shares) at Dec. 31, 2020		36,355,497
Ending balance, Treasury stock (in shares) at Dec. 31, 2020			5,215,657
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	131,673				115,728	15,945	11,943
Net income	143,616
Acquired noncontrolling interest							113
Purchase of additional controlling interest	(1,740)			(951)		(789)	(373)
Sale of noncontrolling interest	1,788			(83)		1,871
Noncontrolling interest distributions	(15,754)					(15,754)	(13,103)
Nonvested stock compensation	15,868			15,868
Issuance of vested stock	1	$ 1
Issuance of vested stock (in shares)		180,235
Treasury shares redeemed to pay income tax	$ (11,827)		$ (12,043)	216
Treasury shares redeemed to pay income tax (in shares)	64,584		64,584
Repurchase of common stock	$ (83,736)		$ (83,736)
Repurchase of common stock (in shares)	634,869		634,869
Issuance of common stock under Employee Stock Purchase Plan (in shares)	13,792	13,792
Issuance of common stock under Employee Stock Purchase Plan	$ 2,472			2,472
Ending balance at Dec. 31, 2021	$ 1,652,099	$ 365	$ (164,790)	979,642	751,025	85,857	17,501
Ending balance (in shares) at Dec. 31, 2021	30,634,414	36,549,524
Ending balance, Treasury stock (in shares) at Dec. 31, 2021			5,915,110
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 50,642				39,871	10,771	9,606
Net income	60,248
Acquired noncontrolling interest	707					707	1,080
Purchase of additional controlling interest	(1,856)			(1,539)		(317)
Sale of noncontrolling interest	(1,164)			(1,164)			6,367
Noncontrolling interest distributions	(12,052)					(12,052)	(9,479)
Nonvested stock compensation	20,017			20,017
Issuance of vested stock	2	$ 2
Issuance of vested stock (in shares)		164,428
Treasury shares redeemed to pay income tax	$ (4,378)		$ (5,446)	1,068
Treasury shares redeemed to pay income tax (in shares)	43,097		36,848
Exercise of stock options (in shares)		13,986	6,249
Repurchase of common stock	$ (566)		$ (198)	(368)
Repurchase of common stock	$ (25,472)		$ (25,472)
Repurchase of common stock (in shares)	190,622		190,622
Issuance of common stock under Employee Stock Purchase Plan (in shares)	16,272	16,272
Issuance of common stock under Employee Stock Purchase Plan	$ 2,380			2,380
Ending balance at Dec. 31, 2022	$ 1,680,359	$ 367	$ (195,906)	$ 1,000,036	$ 790,896	$ 84,966	$ 25,075
Ending balance (in shares) at Dec. 31, 2022	30,595,381	36,744,210
Ending balance, Treasury stock (in shares) at Dec. 31, 2022			6,148,829