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Income Taxes (Schedule of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ 2,090	$ 7,305	$ (15,203)
State	1,066	877	1,153
Deferred:
Federal	7,713	3,325	24,686
State	310	307	(6)
Investment Tax Credits	(79)	(79)	(79)
Total Income Tax Expense	$ 11,100	$ 11,735	$ 10,551

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