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Income Taxes Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ 29,377	$ 21,651	$ 3,723
State	6,452	7,088	3,924
Deferred:
Federal	(1,174)	6,119	16,109
State	738	(1,316)	(484)
Income Tax Expense (Benefit)	$ 35,393	$ 33,542	$ 23,272

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Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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