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Income Taxes (Components of Provision for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current provision:
Federal	$ 4,280	$ 6,440	$ 995
State	429	523	195
Total current provision	4,709	6,963	1,190
Deferred provision:
Federal	(2,713)	(1,846)	6,840
Total deferred provision	(2,713)	(1,846)	6,840
Total income tax expense	$ 1,996	$ 5,117	$ 8,030

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