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Condensed Financial Information of Registrant - CONDENSED BALANCE SHEETS (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Current assets:        
Cash and cash equivalents $ 14,621 $ 257,223 $ 24,453  
Total current assets 1,004,694 1,721,996    
Total assets 15,964,094 17,821,236    
Current liabilities:        
Total current liabilities 1,480,208 2,661,103    
Long-term debt 7,523,349 8,946,719    
Other liabilities 229,748 240,129    
Total liabilities 12,175,448 14,428,088    
Total stockholders' equity 3,788,646 3,393,148 3,248,719 $ 3,039,336
Total liabilities and stockholders' equity 15,964,094 17,821,236    
Parent Company        
Current assets:        
Cash and cash equivalents 1,118 14,639 $ 1,947 $ 139,092
Total current assets 1,118 14,639    
Investment in subsidiaries and other assets 4,463,543 4,036,420    
Total assets 4,464,661 4,051,059    
Current liabilities:        
Dividends payable and other current liabilities 33,047 34,424    
Total current liabilities 33,047 34,424    
Long-term debt 545,557 536,495    
Other liabilities 97,411 86,992    
Total liabilities 676,015 657,911    
Total stockholders' equity 3,788,646 3,393,148    
Total liabilities and stockholders' equity $ 4,464,661 $ 4,051,059