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Shareholders' Equity - AOCI Components (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2015
Repurchase of shares      
Repurchase of common stock (in shares) 0 810,097  
Aggregate cost of treasury shares purchase   $ 59,700  
After-tax amounts:      
Stockholders' Equity Attributable to Parent $ 4,830,293   $ 4,895,846
Accumulated other comprehensive income loss $ (12,074)   (1,377)
Maximum      
Repurchase of shares      
Number of common shares authorized to be repurchased 4,000,000    
Unrealized appreciation on securities      
Pre-tax amounts:      
Accumulated other comprehensive income (loss) before tax $ 9,066   27,021
After-tax amounts:      
Stockholders' Equity Attributable to Parent 6,191   17,201
Defined Benefit Pension Plan      
Pre-tax amounts:      
Accumulated other comprehensive income (loss) before tax (29,651)   (30,144)
After-tax amounts:      
Stockholders' Equity Attributable to Parent $ (18,265)   $ (18,578)