Derivative Instruments and Hedging Activities (Details) - Dec. 31, 2020 € in Thousands, kr in Thousands, $ in Thousands, £ in Millions	USD ($)	EUR (€)	SEK (kr)	GBP (£)
Derivative Liability, Current	$ 58,577
Interest Rate Swap [Member]
Derivative, Notional Amount	480,000
Cross Currency Interest Rate Contract [Member]
Derivative, Notional Amount | €		€ 340,000
Forward Contracts
Derivative, Notional Amount		€ 142,000	kr 227,000	£ 75
Fair Value, Recurring [Member] | Cross Currency Interest Rate Contract [Member]
Derivative Liability, Current	56,328
Fair Value, Recurring [Member] | Interest Rate Swap [Member]
Derivative Liability, Current	899
Fair Value, Recurring [Member] | Forward Contracts
Derivative Liability, Current	$ 1,350