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Fair Value Measurements - Financial Instruments (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
FAIR VALUE MEASUREMENTS      
Unamortized discount and debt issuance costs, net $ 8,328,000 $ 9,407,000  
Interest rate swap agreements | Cash flow hedges      
FAIR VALUE MEASUREMENTS      
Notional amount of derivative instrument 312,500,000 325,000,000 $ 325,000,000
Annual reduction in notional amount of derivative     $ 12,500,000
Credit Agreement, dated March 6, 2018, Term Loan B      
FAIR VALUE MEASUREMENTS      
Unamortized discount and debt issuance costs, net 8,300,000 9,400,000  
Credit Agreement, dated March 6, 2018, Term Loan B | Carrying Value      
FAIR VALUE MEASUREMENTS      
Debt 496,200,000 501,200,000  
Credit Agreement, dated March 6, 2018, Term Loan B | Recurring basis | Level 3 | Fair Value      
FAIR VALUE MEASUREMENTS      
Debt 497,400,000 491,200,000  
Revolving Credit Facility      
FAIR VALUE MEASUREMENTS      
Outstanding amount 0 0  
Seller Notes | Carrying Value      
FAIR VALUE MEASUREMENTS      
Debt $ 9,000,000 $ 4,500,000