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Debt and Credit Facilities - Amended and Restated Senior Secured Credit Facilities (Details)
£ in Millions
3 Months Ended
Jul. 12, 2018
USD ($)
Mar. 31, 2019
USD ($)
Jul. 12, 2018
GBP (£)
Jul. 12, 2018
USD ($)
Jul. 11, 2018
USD ($)
Interest Expense          
Debt Instrument [Line Items]          
Amortization expense   $ 400,000      
Line of Credit | Revolving Credit Facility          
Debt Instrument [Line Items]          
Revolving credit facilities         $ 700,000,000
Term Loan A due July 2023          
Debt Instrument [Line Items]          
Term loans     £ 29.4 $ 186,500,000  
Third Amended And Restated Credit Agreement | Line of Credit | Revolving Credit Facility          
Debt Instrument [Line Items]          
Revolving credit facilities       1,000,000,000.0  
Loss on debt redemption $ 1,900,000        
Accelerated amortization of original issuance discount 1,500,000        
Included in debt redemption was non-lender fees incurred $ 400,000        
Debt issuance lender fees       $ 700,000  
Third Amended And Restated Credit Agreement | Line of Credit | Revolving Credit Facility | Other Assets          
Debt Instrument [Line Items]          
Debt issuance costs capitalized   $ 4,900,000      
Base Rate [Member] | Third Amended And Restated Credit Agreement | Revolving Credit Facility | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate 1.25%        
Base Rate [Member] | Third Amended And Restated Credit Agreement | Revolving Credit Facility | Maximum          
Debt Instrument [Line Items]          
Basis spread on variable rate 2.00%