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Income Taxes (Tax Credit Carryforwards) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Tax Credit Carryforward [Line Items]          
State income taxes, net of federal tax benefit (percent)     3.20% 1.70% 1.80%
Deferred income taxes     $ 2,251 $ (284) $ 7,218
Foreign earnings repatriated $ 9,300        
Tax impact of repatriated foreign earnings 1,100        
New York [Member]          
Tax Credit Carryforward [Line Items]          
State income taxes, net of federal tax benefit (percent)   0.00%   0.00%  
Deferred income taxes   $ 2,300   $ 2,300  
Federal [Member]          
Tax Credit Carryforward [Line Items]          
Operating loss carryforwards 18,000   18,000    
Federal [Member] | Research and Development Credit [Member]          
Tax Credit Carryforward [Line Items]          
Tax credit carryforward $ 7,100   $ 7,100    
State and Local Jurisdiction [Member]          
Tax Credit Carryforward [Line Items]          
Tax credit carryforward       $ 3,300