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Income Taxes Income Taxes (Provision of Income Taxes from Continuing Operations) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
U. S. federal provision $ 6,425 $ 6,609 $ 9,840
State provision 815 1,195 862
Total current provision 7,240 7,804 10,702
Deferred:      
U. S. federal provision (benefit) (12,881) 3,475 1,928
State provision 1,230 1,381 1,107
Total deferred provision (benefit) (11,651) 4,856 3,035
Total income tax provision (benefit) $ (4,411) $ 12,660 $ 13,737