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Derivative Instruments - Derivative Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2018
USD ($)
number
Mar. 31, 2017
USD ($)
Sep. 19, 2017
USD ($)
Dec. 31, 2017
number
Derivative [Line Items]        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax   $ 100    
Interest Rate Swap [Member] | Cash Flow Hedging [Member]        
Derivative [Line Items]        
Derivative, Number of Instruments Held | number 0     0
Senior Secured Term Loan A [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]        
Derivative [Line Items]        
Derivative, Maturity Date     Jun. 30, 2020  
Cash paid at termination of interest rate swap $ 4,700      
Maximum [Member] | Senior Secured Term Loan A [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]        
Derivative [Line Items]        
Derivative, Notional Amount     $ 238,400  
Maximum [Member] | Senior Secured Term Loan A [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Derivative, June 2020 Maturity [Member]        
Derivative [Line Items]        
Derivative, Fixed Interest Rate     2.68%  
Minimum [Member] | Senior Secured Term Loan A [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]        
Derivative [Line Items]        
Derivative, Notional Amount     $ 192,700  
Derivative, Fixed Interest Rate     0.74%  
Designated as Hedging Instrument [Member] | Cross Currency Interest Rate Contract [Member] | Net Investment Hedging [Member]        
Derivative [Line Items]        
Maximum Remaining Maturity of Foreign Currency Derivatives 5 years      
Derivative, Fixed Interest Rate 2.10%      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ 0 $ 0    
Designated as Hedging Instrument [Member] | Maximum [Member] | Cross Currency Interest Rate Contract [Member] | Net Investment Hedging [Member]        
Derivative [Line Items]        
Derivative, Notional Amount 150,000      
Designated as Hedging Instrument [Member] | Minimum [Member] | Cross Currency Interest Rate Contract [Member] | Net Investment Hedging [Member]        
Derivative [Line Items]        
Derivative, Notional Amount $ 75,000