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Debt - Term Loan B (Details) - USD ($)
9 Months Ended 12 Months Ended
Jun. 26, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Debt Instrument [Line Items]        
Write-off of deferred financing costs   $ 1,956,000 $ 925,000  
Secured Debt [Member] | $500 Million Term Loan B [Member]        
Debt Instrument [Line Items]        
Percentage of amortization of original principal balance (as a percent)   1.00%   1.00%
Face amount   $ 500,000,000   $ 500,000,000
Debt instrument, maturity date   May 11, 2024    
Secured Debt [Member] | $500 Million Term Loan B [Member] | Interest Expense [Member]        
Debt Instrument [Line Items]        
Write-off of deferred financing costs   $ 2,000,000    
Secured Debt [Member] | $500 Million Term Loan B [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument [Line Items]        
Spread rate (as a percent) 2.00% 2.00%    
Secured Debt [Member] | Revolving Credit Facility [Member] | $500 Million Term Loan B [Member]        
Debt Instrument [Line Items]        
Face amount   $ 500,000,000    
Line of Credit [Member] | Revolving Credit Facility [Member] | $700 Million Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument [Line Items]        
Spread rate (as a percent)   1.55%