Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurement - Fair Value of Assets and Liabilities Measured on a Recurring Basis (Details)

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Fair Value Measurement - Fair Value of Assets and Liabilities Measured on a Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Liabilities:    
Total liabilities $ 16,222 $ 11,163
Level 2    
Assets:    
Total assets 800 365
Level 2 | Interest rate swap instruments    
Assets:    
Total assets 800 2
Liabilities:    
Liability derivatives 7,285 10,073
Level 2 | Commodity swap instruments    
Assets:    
Total assets 0 363
Liabilities:    
Liability derivatives 3,544 0
Level 2 | Make-whole provisions    
Liabilities:    
Liability derivatives 4,715 412
Level 3    
Liabilities:    
Contingent consideration $ 678 $ 678