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Financial Instruments - Fair Value (Details) - Derivatives designated as cash flow hedges: - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Derivative assets:    
Total derivative assets $ 1,080 $ 0
Derivative liabilities:    
Total derivative liabilities 1,288 3,704
Cash flow hedging | Accrued liabilities | Interest rate caps    
Derivative liabilities:    
Total derivative liabilities 1,288 1,954
Cash flow hedging | Other long-term liabilities | Interest rate caps    
Derivative liabilities:    
Total derivative liabilities 0 1,750
Cash flow hedging | Other long-term assets | Interest rate caps    
Derivative assets:    
Total derivative assets $ 1,080 $ 0