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Condensed Financial Information of Registrant - CONDENSED BALANCE SHEETS (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current assets:        
Cash and cash equivalents $ 24,453 $ 204,998 $ 48,736  
Total current assets 992,531 967,394    
Total assets 16,894,351 16,116,936    
Current liabilities:        
Total current liabilities 1,703,345 1,296,092    
Other liabilities 300,693 510,663    
Total liabilities 13,645,632 13,077,600    
Total stockholders' equity 3,248,719 3,039,336 3,184,369 $ 4,224,805
Total liabilities and stockholders' equity 16,894,351 16,116,936    
Parent Company        
Current assets:        
Cash and cash equivalents 1,947 139,092 $ 354 $ 8
Total current assets 1,947 139,092    
Investment in subsidiaries and other assets 3,850,198 3,472,397    
Total assets 3,852,145 3,611,489    
Current liabilities:        
Dividends payable and other current liabilities 47,482 34,084    
Total current liabilities 47,482 34,084    
Long-term debt 527,098 518,335    
Other liabilities 28,846 19,734    
Total liabilities 603,426 572,153    
Total stockholders' equity 3,248,719 3,039,336    
Total liabilities and stockholders' equity $ 3,852,145 $ 3,611,489