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Segments - Reconciliation of Segment Assets to Total Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Segments    
Assets $ 2,589,966 $ 2,779,722
Assets associated with discontinued operations 9,811 11,036
Operating    
Segments    
Assets 2,479,225 2,639,849
Operating | Contract Operations    
Segments    
Assets 2,429,805 2,593,864
Operating | Aftermarket Services    
Segments    
Assets 49,420 45,985
Corporate    
Segments    
Assets $ 100,930 $ 128,837