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Long-term Debt - Narrative - Senior Credit Facility (Details)
9 Months Ended
Jun. 17, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2020
Sep. 30, 2018
Dec. 31, 2016
USD ($)
Jun. 16, 2016
USD ($)
Debt Instrument [Line Items]            
Total senior debt   $ 373,200,000     $ 388,000,000  
Term loan facility amortize percentage   5.00%        
Minimum            
Debt Instrument [Line Items]            
Commitment fees   0.30%        
Maximum            
Debt Instrument [Line Items]            
Commitment fees   0.45%        
Leverage ratio   3.25        
Scenario, Forecast            
Debt Instrument [Line Items]            
Term loan facility amortize percentage     10.00% 7.50%    
Term loan            
Debt Instrument [Line Items]            
Total senior debt   $ 375,000,000     $ 390,000,000  
Term loan | Minimum            
Debt Instrument [Line Items]            
Letter of credit fees   1.75%        
Term loan | Maximum            
Debt Instrument [Line Items]            
Letter of credit fees   2.50%        
Term loan | LIBOR | Minimum            
Debt Instrument [Line Items]            
Interest rate basis point addition to LIBOR or base rate   1.75%        
Term loan | LIBOR | Maximum            
Debt Instrument [Line Items]            
Interest rate basis point addition to LIBOR or base rate   2.50%        
Line of Credit | Senior Credit Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 750,000,000.0         $ 300,000,000.0
Line of Credit | Senior Credit Facility | June 30, 2016            
Debt Instrument [Line Items]            
Interest coverage ratio 3.00          
Line of Credit | Senior Credit Facility | June 30, 2017 through September 30, 2017            
Debt Instrument [Line Items]            
Leverage ratio 4.00          
Line of Credit | Senior Credit Facility | December 31, 2017 through September 30, 2018            
Debt Instrument [Line Items]            
Leverage ratio 3.75          
Line of Credit | Senior Credit Facility | From December 31, 2018 thereafter            
Debt Instrument [Line Items]            
Leverage ratio 3.50          
Line of Credit | Senior Credit Facility | Two Quarters After Consummation of a Qualified Acquisition            
Debt Instrument [Line Items]            
Leverage ratio 0.50          
Line of Credit | Revolving Credit Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 350,000,000.0          
Proceeds from lines of credit 100,000,000          
Long-term Line of Credit   $ 0        
Line of Credit | Term loan            
Debt Instrument [Line Items]            
Maximum borrowing capacity 400,000,000.0          
Repayments of debt 90,000,000          
Line of Credit | Letter of Credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity 100,000,000.0          
Outstanding letters of credit   $ 39,100,000        
Line of Credit | Bridge Loan            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 10,000,000.0