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Income Taxes (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current      
Federal $ 7,020 $ 9,838 $ 12,433
State 1,557 2,871 3,006
Current Income Tax Expense (Benefit) 8,577 12,709 15,439
Deferred      
Federal (1,453) 2,491 1,553
Foreign (875) 481 (272)
State (2,763) 1,233 277
Deferred Income Tax Expense (Benefit) (5,091) 4,205 1,558
Income tax expense $ 3,486 $ 16,914 $ 16,997