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Segments - Reconciliation of Segment Assets to Total Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets    
Assets $ 2,552,515 $ 2,408,007
Assets associated with discontinued operations 7,363 13,563
Operating    
Revenues from External Customers and Long-Lived Assets    
Assets 2,247,371 2,167,618
Operating | Contract Operations    
Revenues from External Customers and Long-Lived Assets    
Assets 2,155,270 2,063,178
Operating | Aftermarket Services    
Revenues from External Customers and Long-Lived Assets    
Assets 92,101 104,440
Other    
Revenues from External Customers and Long-Lived Assets    
Assets $ 297,781 $ 226,826