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Financial Instruments (Narrative) (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2017
EUR (€)
Gain (loss) from the change in fair value of financial instruments $ 6,600,000 $ (2,500,000) $ 0    
Notional amount $ 494,200,000 $ 625,900,000      
Interest Rate Swaps [Member] | Cash Flow Hedging [Member]          
Derivative, maturity date Feb. 14, 2024        
Notional amount $ 311,200,000        
Net loss to be reclassified during next 12 months, net $ (8,500,000)        
Cross Currency Swaps [Member] | Cash Flow Hedging [Member]          
Derivative, maturity date Feb. 14, 2024        
Notional amount $ 223,700,000        
Net loss to be reclassified during next 12 months, net $ 100,000        
Secured Term Loan [Member] | Interest Rate Swaps [Member]          
Debt amount issued       $ 150,000,000  
Secured Euro Term Loan [Member] | Interest Rate Swaps [Member]          
Debt amount issued | €         € 90,000,000