CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Common  Stock	Additional paid-in capital	Accumulated other comprehensive (loss) income	Retained Earnings	Treasury stock	Noncontrolling interests
Beginning balance at Dec. 31, 2019	$ 753,759	$ 24,062	$ 164,217	$ (2,699)	$ 564,392	$ (2,666)	$ 6,453
Increase (Decrease) in Stockholders' Equity
Net income	154,905				154,905
Dividends on common stock	(30,478)				(30,478)
Issuance of Common Stock	108,961	3,026	105,935
Stock-based compensation	5,751	18	5,733
Stock repurchases	(1,054)	(26)	(1,028)
Change in net unrealized gains and losses on investments, net of taxes	15,443			15,443
Reclassification adjustment for realized gains and losses on investments, net of taxes	(511)			(511)
Foreign currency translation adjustments (net of tax)	4,789			4,789
Net income attributable to noncontrolling interests	14,767						14,767
Distributions to noncontrolling interests	(13,944)						(13,944)
Net effect of changes in ownership and other	18						18
Ending balance at Dec. 31, 2020	1,012,406	27,080	274,857	17,022	688,819	(2,666)	7,294
Increase (Decrease) in Stockholders' Equity
Net income	323,216				323,216
Dividends on common stock	(37,235)				(37,235)
Stock-based compensation	11,966	144	11,822
Stock option and employee stock purchase plan exercises	2,715	64	2,651
Stock repurchases	(2,252)	(42)	(2,210)
Purchase of remaining interest of consolidated subsidiary	(5,616)		(4,744)				(872)
Change in net unrealized gains and losses on investments, net of taxes	(13,650)			(13,650)
Reclassification adjustment for realized gains and losses on investments, net of taxes	(2,440)			(2,440)
Foreign currency translation adjustments (net of tax)	(679)			(679)
Net income attributable to noncontrolling interests	16,766						16,766
Distributions to noncontrolling interests	(16,407)						(16,407)
Net effect of changes in ownership and other	5,945						5,945
Ending balance at Dec. 31, 2021	1,294,735	27,246	282,376	253	974,800	(2,666)	12,726
Increase (Decrease) in Stockholders' Equity
Net income	162,305				162,305
Dividends on common stock	(45,289)				(45,289)
Stock-based compensation	12,282	164	12,118
Stock option and employee stock purchase plan exercises	5,828	124	5,704
Stock repurchases	(3,262)	(51)	(3,211)
Purchase of remaining interest of consolidated subsidiary	(3,838)		(126)				(3,712)
Change in net unrealized gains and losses on investments, net of taxes	(35,416)			(35,416)
Reclassification adjustment for realized gains and losses on investments, net of taxes	(1,241)			(1,241)
Foreign currency translation adjustments (net of tax)	(14,939)			(14,939)
Net income attributable to noncontrolling interests	19,483						19,483
Distributions to noncontrolling interests	(20,640)						(20,640)
Net effect of changes in ownership and other	257						257
Ending balance at Dec. 31, 2022	$ 1,370,265	$ 27,483	$ 296,861	$ (51,343)	$ 1,091,816	$ (2,666)	$ 8,114