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Segments - Reconciliation of Segment Assets to Total Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets    
Assets $ 2,779,722 $ 3,109,975
Assets associated with discontinued operations 11,036 12,901
Operating Segments    
Revenues from External Customers and Long-Lived Assets    
Assets 2,639,849 2,983,556
Operating Segments | Contract Operations    
Revenues from External Customers and Long-Lived Assets    
Assets 2,593,864 2,915,724
Operating Segments | Aftermarket Services    
Revenues from External Customers and Long-Lived Assets    
Assets 45,985 67,832
Corporate    
Revenues from External Customers and Long-Lived Assets    
Assets $ 128,837 $ 113,518