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Condensed Financial Information of Registrant - CONDENSED STATEMENTS OF CASH FLOWS (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities:                      
Net income (loss) $ 575,872 $ (86,237) $ 92,211 $ (118,837) $ 150,750 $ (161,249) $ 91,517 $ 51,645 $ 463,009 $ 132,663 $ (340,820)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:                      
Change in fair value of other financial instruments                 0 63,396 0
Other, net                 (125,844) 783 70,213
Net cash provided by (used in) operating activities                 1,657,726 1,887,920 1,649,723
Cash flows from investing activities:                      
Net cash provided by (used in) investing activities                 242,493 (1,532,784) (1,695,745)
Cash flows from financing activities:                      
Proceeds from issuance of common stock, net of expenses                 0 1,180,000 0
Dividends on common stock                 (128,587) (127,125) (116,348)
Repurchases of common stock                 0 (1,200,000) 0
Other financing, net                 (32,175) (5,432) (23,718)
Net cash provided by (used in) financing activities                 (2,143,849) (14,833) (128,448)
Cash and cash equivalents and restricted cash and restricted cash equivalents:                      
Net increase (decrease) during the period                 (243,630) 340,303 (174,470)
Beginning balance       257,223       24,453 257,223 24,453  
Ending balance 14,621       257,223       14,621 257,223 24,453
Supplementary cash flow information:                      
Issuance of shares for acquisition of business                 0 55,485 528,503
Parent Company                      
Cash flows from operating activities:                      
Net income (loss)                 463,009 132,663 (340,820)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:                      
Equity in net (income) loss of subsidiaries                 (470,520) (200,715) 333,404
Change in fair value of other financial instruments                 0 63,396 0
Other, net                 28,757 49,470 24,391
Net cash provided by (used in) operating activities                 21,246 44,814 16,975
Cash flows from investing activities:                      
Contributions to subsidiaries                 0 0 (40,000)
Distributions from subsidiaries                 108,783 118,200 8,700
Net cash provided by (used in) investing activities                 108,783 118,200 (31,300)
Cash flows from financing activities:                      
Proceeds from issuance of common stock, net of expenses                 0 1,180,000 0
Dividends on common stock                 (128,587) (127,125) (116,348)
Repurchases of common stock                 0 (1,200,000) 0
Other financing, net                 (14,963) (3,197) (6,472)
Net cash provided by (used in) financing activities                 (143,550) (150,322) (122,820)
Cash and cash equivalents and restricted cash and restricted cash equivalents:                      
Net increase (decrease) during the period                 (13,521) 12,692 (137,145)
Beginning balance       $ 14,639       $ 1,947 14,639 1,947 139,092
Ending balance $ 1,118       $ 14,639       1,118 14,639 1,947
Supplementary cash flow information:                      
Issuance of shares for acquisition of business                 $ 0 $ 55,485 $ 528,503