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Credit Facility (Details) - Line of Credit [Member]
3 Months Ended 9 Months Ended
Jan. 07, 2015
USD ($)
Sep. 30, 2015
Sep. 30, 2016
USD ($)
Line of Credit Facility [Line Items]      
Term of credit facility 5 years    
Aggregate amount $ 250,000,000    
Additional borrowing capacity $ 250,000,000    
Weighted average interest rate (percent)   1.82%  
Amount outstanding     $ 0
Consolidated leverage ratio 3.5    
Consolidated interest coverage ratio 3.0    
Letter of Credit [Member]      
Line of Credit Facility [Line Items]      
Aggregate amount $ 25,000,000    
Swing Line Loans [Member]      
Line of Credit Facility [Line Items]      
Aggregate amount $ 10,000,000    
LIBOR [Member]      
Line of Credit Facility [Line Items]      
Basis spread on LIBOR (percent)     1.10%
Minimum [Member]      
Line of Credit Facility [Line Items]      
Quarterly facility fee (percent)     0.125%
Minimum [Member] | LIBOR [Member]      
Line of Credit Facility [Line Items]      
Basis spread on LIBOR (percent)     1.00%
Maximum [Member]      
Line of Credit Facility [Line Items]      
Quarterly facility fee (percent)     0.20%
Maximum [Member] | LIBOR [Member]      
Line of Credit Facility [Line Items]      
Basis spread on LIBOR (percent)     1.30%