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Income Taxes (Current and Deferred Portions of Net Income Tax Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current      
U.S. $ 56,974 $ 52,403 $ 65,196
State 2,662 3,362 5,258
Foreign     (6)
Total current taxes 59,636 55,765 70,448
Deferred      
U.S. 4,620 7,279 (261)
State (50) 27 (71)
Total deferred taxes 4,570 7,306 (332)
Total income taxes $ 64,206 $ 63,071 $ 70,116