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Income Taxes (Schedule of Income Tax Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current: |  |  |
Federal | $ (188) | $ 2,090 | $ 7,305
State | 2,073 | 1,066 | 877
Deferred: |  |  |
Federal | (338) | 7,713 | 3,325
State | (545) | 310 | 307
Investment Tax Credits | (78) | (79) | (79)
Total Income Tax Expense | $ 924 | $ 11,100 | $ 11,735

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