Schedule I - Financial Information of the Registrant (Parent Company) - Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of net income to cash provided by operating activities:
Net income	$ 162,305	$ 323,216	$ 154,905
Add (deduct):
Depreciation	57,178	36,386	19,216
Increase in receivables – net	10,154	(18,822)	(6,598)
Decrease (increase) in other assets – net	2,503	(5,931)	(5,380)
(Decrease) increase in payables and accrued liabilities – net	(87,502)	(22,316)	62,738
Income from and other adjustments for subsidiaries	(3,257)	(9,488)	(3,504)
Cash provided by operating activities	191,860	390,291	275,806
Investing activities:
Cash used by investing activities	(300,665)	(645,276)	(231,370)
Financing activities:
Dividends paid	(44,672)	(36,637)	(30,226)
Repurchases of Common Stock	(3,262)	(2,252)	(1,054)
Proceeds from stock option and employee stock purchase plan exercises	5,828	2,715	0
Proceeds from notes payable	39,499	1,197,351	16,456
Payments on notes payable	(76,486)	(809,816)	(25,581)
Purchase of remaining interest of consolidated subsidiary	(3,838)	(5,616)	0
Issuance of Common Stock	0	0	108,961
Payment for debt issuance costs	115	(7,404)	(311)
Cash (used) provided by financing activities	(123,220)	310,374	54,301
(Decrease) increase in cash and cash equivalents	(237,552)	53,236	102,074
Cash and cash equivalents at beginning of year	485,919	432,683	330,609
Cash and cash equivalents at end of year	248,367	485,919	432,683
Supplemental information:
Income taxes paid, net	60,088	106,101	44,756
Interest paid	17,398	2,828	2,604
Parent company
Reconciliation of net income to cash provided by operating activities:
Net income	162,305	323,216	154,905
Add (deduct):
Depreciation	0	0	4
Increase in receivables – net	(27,536)	(19,261)	(1,998)
Decrease (increase) in other assets – net	2,925	(1,574)	(529)
(Decrease) increase in payables and accrued liabilities – net	(1,963)	(297)	2,978
Income from and other adjustments for subsidiaries	31,886	(31,841)	(140,816)
Cash provided by operating activities	167,617	270,243	14,544
Investing activities:
Investments in and contributions to subsidiaries	(109,126)	(615,147)	(85,470)
Collections on notes receivables	0	45,193	40,000
Increases in notes receivables	0	0	(80,000)
Cash used by investing activities	(109,126)	(569,954)	(125,470)
Financing activities:
Dividends paid	(44,672)	(36,637)	(30,226)
Repurchases of Common Stock	(3,262)	(2,252)	(1,054)
Proceeds from stock option and employee stock purchase plan exercises	5,828	2,715	0
Proceeds from notes payable	0	1,004,703	0
Payments on notes payable	0	(643,875)	0
Purchase of remaining interest of consolidated subsidiary	0	(5,616)	0
Issuance of Common Stock	0	0	108,961
Payment for debt issuance costs	0	(7,404)	0
Cash (used) provided by financing activities	(42,106)	311,634	77,681
(Decrease) increase in cash and cash equivalents	16,385	11,923	(33,245)
Cash and cash equivalents at beginning of year	15,527	3,604	36,849
Cash and cash equivalents at end of year	31,912	15,527	3,604
Supplemental information:
Income taxes paid, net	0	5	180
Interest paid	$ 17,271	$ 2,795	$ 2,490