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Leases (Summary of Amounts Recognized in Condensed Consolidated Balance Sheet) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Assets |  |  |
Operating lease assets | $ 85,766 | $ 0 | $ 0
Finance lease assets, property, plant and equipment, net | 25,379 |  |
Total leased assets | 114,941 |  |
Liabilities |  |  |
Current operating leases | 28,017 |  |
Non-current operating leases | 57,451 | 0 | 0
Total operating lease liabilities | 85,468 |  |
Current finance leases | 6,007 | 0 | 0
Non-current finance leases | 23,058 | $ 0 | $ 0
Total finance lease liabilities | 29,065 |  |
Total lease liabilities | 114,533 |  |
Rail |  |  |
Assets |  |  |
Finance lease assets, property, plant and equipment, net | $ 3,796 |  |

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