Annual report pursuant to Section 13 and 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) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Liabilities    
Contingent consideration $ 0 $ 6,059
Recurring    
Liabilities    
Total liabilities 11,163 7,832
Recurring | Level 2    
Assets    
Asset derivatives 365 213
Recurring | Level 2 | Interest rate swap instruments    
Assets    
Asset derivatives 2 15
Liabilities    
Liability derivatives 10,073 6,236
Recurring | Level 2 | Commodity swap instruments    
Assets    
Asset derivatives 363 198
Recurring | Level 2 | Make-whole provisions    
Liabilities    
Liability derivatives 412 918
Recurring | Level 3    
Liabilities    
Contingent consideration $ 678 $ 678