Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - (Narrative) (Details)

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Fair Value Measurements - (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Contingent consideration arrangement $ 6,000    
Contingent consideration, gain (loss) due to change in value   $ 200  
Asset retirement obligation capitalized 483 $ 381  
Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Contingent consideration arrangement 6,000   $ 6,200
Asset retirement obligation capitalized 500    
Prepaid Expenses and Other Current Assets      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Contingent consideration arrangement 1,300    
Other Noncurrent Assets      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Contingent consideration arrangement $ 4,700