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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

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