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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal statutory rate	35.00%
AMT credit carryforward balance	$ 47,200	$ 36,300
Net increase of unrecognized tax benefits	800
Unrecognized tax benefits	12,954	12,165	$ 12,612
Unrecognized tax benefits that would impact effective tax rate	11,800	10,900
Interest and penalty expense, excluding refunds	606	112	$ 739
Accrued interest and penalty	$ 3,521	$ 2,915

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

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The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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