Income Taxes (Narratives) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Taxes [Abstract]
Statutary tax rate	39.00%
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	$ 1,300		$ 1,300		$ 1,300
Deferred Tax Assets, Net	125,141		125,141		127,421
OtherComprehensiveIncomeLossTax	(2,284)			$ (564)	(564)
Income Tax Expense (Benefit)	9,595	$ 3,993	17,605	$ 13,197
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 48		$ 48		$ 97
Effective tax rate			32.40%	29.00%

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of interest expense accrued for an underpayment of income taxes.

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