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Income Taxes Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current:      
Federal $ 93,538 $ 76,902 $ 63,266
State 8,121 6,567 4,574
Foreign 265 188 76
Total Current 101,924 83,657 67,916
Deferred:      
Federal 17,057 17,317 20,497
State 597 1,753 916
Foreign (158) 193 201
Total Deferred 17,496 19,263 21,614
Total $ 119,420 $ 102,920 $ 89,530