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Changes in Accumulated Other Comprehensive Income / (Loss) by Component (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Changes in Accumulated Other Comprehensive Loss [Roll Forward]      
Balance, Beginning of Period $ 5,081,743 $ 3,899,899 $ 3,940,888
Other Comprehensive Loss before Reclassifications (4,868)    
Amounts Reclassified from Accumulated Other Comprehensive Loss, net of tax 167    
Balance, End of Period 4,962,309 5,081,743 3,899,899
Accumulated Other Comprehensive Loss      
Changes in Accumulated Other Comprehensive Loss [Roll Forward]      
Balance, Beginning of Period (7,904) (8,476) (392,556)
Balance, End of Period $ (12,605) $ (7,904) $ (8,476)