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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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