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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Contingency [Line Items]
Deferred Tax Assets, Valuation Allowance		$ 0	$ 0
State income tax rate		0.70%	(0.80%)	3.80%
Amount accrued for interest or penalties		$ 0	$ 0
Domestic Country [Member]
Income Tax Contingency [Line Items]
Operating Loss Carryforwards		0
State And Local Jurisdiction [Member]
Income Tax Contingency [Line Items]
Operating Loss Carryforwards		0
Tax Credit Carryforward, Amount		$ 800
New York [Member]
Income Tax Contingency [Line Items]
State income tax rate		7.10%
New York [Member] \| Scenario, Forecast [Member]
Income Tax Contingency [Line Items]
State income tax rate	6.50%
Minimum [Member] \| Domestic Country [Member]
Income Tax Contingency [Line Items]
Federal income tax years currently open for audtis		2013
Minimum [Member] \| State And Local Jurisdiction [Member]
Income Tax Contingency [Line Items]
Federal income tax years currently open for audtis		2012
Maximum [Member] \| Domestic Country [Member]
Income Tax Contingency [Line Items]
Federal income tax years currently open for audtis		2015
Maximum [Member] \| State And Local Jurisdiction [Member]
Income Tax Contingency [Line Items]
Federal income tax years currently open for audtis		2015