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Long-term Debt (Narrative) (Details) - USD ($)
6 Months Ended
Jun. 05, 2015
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Debt, maximum allowed borrowing capacity $ 150,000,000.0    
Increase option 100,000,000.0 $ 100,000,000  
Interest rate   1.70%  
Fees $ 400,000    
Debt outstanding   $ 79,600,000 $ 79,600,000
Default interest rate above applicable interest rate   2.00%  
Revolver | LIBOR Rate | Minimum      
Debt Instrument [Line Items]      
Debt instrument, interest rate margin 1.25%    
Revolver | LIBOR Rate | Maximum      
Debt Instrument [Line Items]      
Debt instrument, interest rate margin 1.75%    
Letter Of Credit      
Debt Instrument [Line Items]      
Debt, maximum allowed borrowing capacity $ 15,000,000.0