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Debt - Narrative (Details) - Term Loan - USD ($)
9 Months Ended
Jun. 07, 2018
Sep. 30, 2018
LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate   2.75%
Amendment    
Debt Instrument [Line Items]    
Face amount $ 100,000,000.0 $ 100,000,000.0
Decrease in applicable interest rate 0.50%  
Amendment | Base Rate    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.75%  
Amendment | LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate 2.75%  
Existing Credit Agreement    
Debt Instrument [Line Items]    
Springing leverage ratio financial maintenance covenant requirement threshold, percent of aggregate revolving credit commitments   35.00%