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Long-Term Debt and Revolving Lines of Credit - Narrative (Details)
9 Months Ended
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]    
Effective interest rate 4.07%  
Long-term debt $ 848,625,000 $ 847,875,000
Leverage ratio two 3.25  
Leverage ratio three 3.00  
Debt service coverage ratio, actual 3.88  
Debt instrument covenants minimum liquidity amount $ 25,000,000  
Maximum    
Debt Instrument [Line Items]    
Leverage ratio one 3.75  
Minimum    
Debt Instrument [Line Items]    
Debt service coverage ratio, actual 2.00  
Term loan A-1    
Debt Instrument [Line Items]    
Effective interest rate 3.99%  
Long-term debt $ 448,625,000 472,875,000
Periodic payment principal, period two $ 12,100,000  
Term loan A-1 | London Interbank Offered Rate (LIBOR)    
Debt Instrument [Line Items]    
Variable interest rate 2.75%  
Term loan A-2    
Debt Instrument [Line Items]    
Effective interest rate 4.24%  
Long-term debt $ 400,000,000 $ 375,000,000
Periodic payment of principal $ 10,000,000  
Term loan A-2 | London Interbank Offered Rate (LIBOR)    
Debt Instrument [Line Items]    
Variable interest rate 3.00%