Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments - Narrative (Details)

v3.10.0.1
Derivative Instruments - Narrative (Details)
9 Months Ended
Sep. 30, 2018
USD ($)
Mar. 29, 2018
USD ($)
arrangement
Jul. 22, 2016
USD ($)
arrangement
Sep. 15, 2015
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]        
Estimated derivative gain (loss) to be reclassified within twelve months $ 3,600,000      
Interest Rate Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, notional amount 400,000,000      
Fair value of derivative net asset position $ 17,200,000      
2015 Term Loan [Member] | Interest Rate Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Number of derivative instruments held       2
Derivative, notional amount       $ 150,000,000
Derivative, fixed interest rate (percent)       2.72%
2016 Term Loan [Member] | Interest Rate Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Number of derivative instruments held | arrangement     2  
Derivative, notional amount     $ 150,000,000  
Derivative, fixed interest rate (percent)     2.86%  
2018 Term Loan [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Debt instrument, face amount   $ 250,000,000    
2018 Term Loan [Member] | Interest Rate Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Number of derivative instruments held | arrangement   4    
2018 Term Loan A [Member] | Interest Rate Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, notional amount   $ 150,000,000    
Derivative, fixed interest rate (percent)   2.31%    
2018 Term Loan B [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, notional amount   $ 100,000,000    
2018 Term Loan B [Member] | Interest Rate Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, notional amount   $ 100,000,000    
Derivative, fixed interest rate (percent)   3.71%