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Income Taxes Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
Federal $ 14,485 $ 29,377 $ 21,651
State 5,066 6,452 7,088
Deferred:      
Federal (7,702) (1,174) 6,119
State (1,784) 738 (1,316)
Income Tax Expense (Benefit) $ 10,065 $ 35,393 $ 33,542