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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Contingency [Line Items]      
Federal tax rate 35.00% 35.00% 35.00%
State income tax rate 1.10% 0.80% 0.70%
Tax Cuts and Jobs Act of 2017, Maximum Operating Loss Carrybacks and Carryforwards Percentage 80.00%    
Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Deferred Tax Liability, Income Tax (Expense) Benefit $ 2,900    
Interest or penalties recorded in income statement 0 $ 0 $ 0
Amount accrued for interest or penalties $ 0 $ 0  
Scenario, Plan [Member]      
Income Tax Contingency [Line Items]      
Federal tax rate 21.00%    
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    
New York [Member]      
Income Tax Contingency [Line Items]      
State income tax rate   6.50% 7.10%
Minimum [Member] | Domestic Country [Member]      
Income Tax Contingency [Line Items]      
Federal income tax years currently open for audtis 2014    
Minimum [Member] | State And Local Jurisdiction [Member]      
Income Tax Contingency [Line Items]      
Federal income tax years currently open for audtis 2013    
Maximum [Member] | Domestic Country [Member]      
Income Tax Contingency [Line Items]      
Federal income tax years currently open for audtis 2016    
Maximum [Member] | State And Local Jurisdiction [Member]      
Income Tax Contingency [Line Items]      
Federal income tax years currently open for audtis 2016