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Taxes - Constituents of Provision for Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal $ 78,054 $ 14,459 $ 16,430
State 2,687 (617) 378
Foreign 7,714 8,149 4,946
Current income tax expense (benefit), Total 88,455 21,991 21,754
Deferred:      
Federal 1,569 (3,031) (2,541)
State (639) 1,066 (165)
Foreign 359 (1,058) 250
Deferred income tax expense (benefit), Total 1,289 (3,023) (2,456)
Income tax expense (benefit), continuing operations, Total $ 89,744 $ 18,968 $ 19,298