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Revenue - Change in Contract Balances (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Contract assets    
Contract with customer, asset, net, beginning balance $ 21,778  
Payments received for services billed in current period (21,769)  
Services provided and billed in current period 118,883  
Payments received for services billed in current period (99,367)  
Contract with customer, asset, net, ending balance 19,525  
Contract liabilities    
Contract with customer, liability, beginning balance (18,736)  
Amortization of deferred commissioning period revenue 2,043  
Contract with customer, liability, ending balance (16,693)  
Amounts due from related parties 6,676 $ 3,484
Management and administrative services revenue | Related Parties    
Contract liabilities    
Amounts due from related parties $ 300