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Schedule II - Condensed Financial Information of Registrant (Condensed Balance Sheets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Assets        
Cash and cash equivalents $ 791,266 $ 397,749 $ 701,514 $ 897,529
Other assets 173,726 112,171    
Total assets 56,053,472 49,029,392    
Liabilities:        
Notes and loan payable 493,755 393,227    
Other liabilities 1,090,896 629,897    
Total liabilities 53,761,877 47,084,857    
Stockholders' equity:        
Common stock 88,001 81,354    
Additional paid-in capital 770,344 630,367    
Accumulated other comprehensive income 339,966 201,663    
Retained earnings 1,093,284 1,031,151    
Total stockholders' equity 2,291,595 1,944,535 2,139,876 1,384,687
Total liabilities and stockholders' equity 56,053,472 49,029,392    
Parent Company [Member]        
Assets        
Cash and cash equivalents 36,394 38,903 $ 61,139 $ 252,541
Equity securities of subsidiary trusts 7,422 7,415    
Receivable from subsidiaries 182 207    
Deferred income taxes 9,528 11,645    
Federal income tax recoverable, including amount from subsidiaries 0 7,747    
Other assets 2,540 2,270    
Total assets, excluding investment in and advances to subsidiaries 56,066 68,187    
Investment in and advances to subsidiaries 2,992,217 2,526,972    
Total assets 3,048,283 2,595,159    
Liabilities:        
Notes and loan payable 493,755 393,227    
Subordinated debentures payable to subsidiary trusts 241,853 241,452    
Federal income tax payable 3,614 0    
Other liabilities 17,466 15,945    
Total liabilities 756,688 650,624    
Stockholders' equity:        
Common stock 88,001 81,354    
Additional paid-in capital 770,344 630,367    
Accumulated other comprehensive income 339,966 201,663    
Retained earnings 1,093,284 1,031,151    
Total stockholders' equity 2,291,595 1,944,535    
Total liabilities and stockholders' equity $ 3,048,283 $ 2,595,159