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Income Taxes - Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal $ 330,191 $ 322,940 $ 124,503
State 47,228 44,525 20,442
International 3,422 1,928 856
Total current income tax 380,841 369,393 145,801
Deferred:      
Federal (98,760) 88,412 71,016
State 37,347 (28,530) (9,737)
International 4,431 2,486 430
Total deferred income tax (56,982) 62,368 61,709
Continuing operations $ 323,859 $ 431,761 $ 207,510