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Segments - Reconciliation of Segment Assets to Total Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets    
Assets $ 3,109,975 $ 2,552,515
Assets associated with discontinued operations 12,901 7,363
Operating    
Revenues from External Customers and Long-Lived Assets    
Assets 2,983,556 2,462,764
Operating | Contract Operations    
Revenues from External Customers and Long-Lived Assets    
Assets 2,915,724 2,383,381
Operating | Aftermarket Services    
Revenues from External Customers and Long-Lived Assets    
Assets 67,832 79,383
Other    
Revenues from External Customers and Long-Lived Assets    
Assets $ 113,518 $ 82,388