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Long-term Debt (Narrative) (Details) - USD ($)
12 Months Ended
Jun. 05, 2015
Dec. 31, 2016
Aug. 01, 2016
Dec. 31, 2015
Debt Instrument [Line Items]        
Debt, maximum allowed borrowing capacity $ 150,000,000   $ 250,000,000  
Increase option 100,000,000      
Debt outstanding   $ 249,500,000   $ 79,600,000
Interest rate   1.90%    
Fees 200,000      
Default interest rate above applicable interest rate   2.00%    
Letter Of Credit        
Debt Instrument [Line Items]        
Debt, maximum allowed borrowing capacity $ 15,000,000      
Revolver | LIBOR Rate | Minimum        
Debt Instrument [Line Items]        
Variable interest rate spread 1.25%      
Revolver | LIBOR Rate | Maximum        
Debt Instrument [Line Items]        
Variable interest rate spread 1.75%      
ADP/COBRA/CHSA        
Debt Instrument [Line Items]        
Proceeds from Long-term Lines of Credit   $ 169,900,000