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Income Taxes (Schedule of Income Tax Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Current: |  |  |
Federal | $ (15,203) | $ 5,920 | $ 5,018
State | 1,153 | 887 | 688
Deferred: |  |  |
Federal | 24,686 | 3,018 | 2,855
State | (6) | 191 | 139
Investment Tax Credits | (79) | (79) | (79)
Total Income Tax Expense | $ 10,551 | $ 9,937 | $ 8,621

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