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Income Taxes (Components of Net Income Before Income Taxes) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]                      
Domestic                 $ 565,842 $ 579,622 $ 523,044
Foreign                 65,599 34,584 33,995
Income before income taxes $ 159,968 $ 162,870 $ 162,346 $ 146,257 $ 143,599 $ 157,595 $ 154,254 $ 158,758 $ 631,441 $ 614,206 $ 557,039