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Income Taxes - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax [Line Items]                        
Federal Statutory Tax Rate                 21.00% 35.00% 35.00%  
Tax Cut and Jobs Act of 2017 benefit to income tax expense                   $ 98,500,000    
Income taxes $ 21,381,000 $ 26,296,000 $ 27,065,000 $ 17,248,000 $ (60,354,000) $ 33,565,000 $ 33,282,000 $ 22,772,000 $ 91,990,000 29,265,000 $ 118,181,000  
Deferred tax assets, operating loss carryforwards, state and local 12,200,000               12,200,000      
Unrecognized tax benefits that would impact effective tax rate 13,900,000       $ 13,400,000       13,900,000 13,400,000    
Unrecognized tax benefits, income tax penalties and interest accrued 1,900,000               1,900,000      
Unrecognized tax benefits, interest benefit                   300,000 $ 300,000 $ 300,000
Unrecognized tax penalties                 0      
Foreign [Member]                        
Income Tax [Line Items]                        
Tax credits $ 46,500,000               46,500,000      
AFS Investments [Member]                        
Income Tax [Line Items]                        
Income taxes                   7,800,000    
Canada [Member]                        
Income Tax [Line Items]                        
Amount recognized for one-time mandatory deemed repatriation                 $ 2,700,000 6,100,000    
Tax Cuts and Jobs Act of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense                   $ 3,000,000.0    
Maximum [Member]                        
Income Tax [Line Items]                        
Provisional information accounting incomplete measurement period                   1 year