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Bank Debt (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 18, 2016
Mar. 17, 2016
Debt Instrument [Line Items]      
Closing costs of debt $ 9.1    
Loan initiation amortization period 5 years    
Credit agreement, amount outstanding $ 256.0    
Credit facility, maximum borrowing capacity   $ 200.0 $ 250.0
Maximum annual capex 30.0    
Debt, unused borrowing capacity $ 67.0    
Maximum leverage ratio 289.00%    
Debt service coverage ratio 240.00%    
Minimum [Member]      
Debt Instrument [Line Items]      
Fixed charge coverage ratio 125.00%    
Leverage ratio 275.00%    
Maximum [Member]      
Debt Instrument [Line Items]      
Leverage ratio 400.00%    
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt, interest rate spread on variable rate 2.25%    
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Debt, interest rate spread on variable rate 4.00%    
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Credit agreement, amount outstanding $ 125.0    
Credit Agreement [Member]      
Debt Instrument [Line Items]      
Debt maturity date Aug. 01, 2019    
Term Loan [Member]      
Debt Instrument [Line Items]      
Credit agreement, amount outstanding $ 131.0