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Fixed Assets and Mineral Leaseholds (Schedule of Fixed Assets) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fixed assets, at cost | $ 5,686,153 | $ 5,601,015
Less: Accumulated depreciation | (867,465) | (734,986)
Net fixed assets | 4,818,688 | 4,866,029
Crude oil pipelines and natural gas pipelines and related assets |  |
Fixed assets, at cost | 3,090,475 | 3,028,657
Onshore facilities, machinery, and equipment |  |
Fixed assets, at cost | 725,624 | 692,364
Onshore facilities, machinery, and equipment | Alkali Business |  |
Fixed assets, at cost | 506,924 | 497,601
Transportation equipment |  |
Fixed assets, at cost | 21,529 | 21,483
Marine vessels |  |
Fixed assets, at cost | 935,823 | 918,953
Land, buildings and improvements |  |
Fixed assets, at cost | 230,665 | 223,186
Office equipment, furniture and fixtures |  |
Fixed assets, at cost | 18,924 | 18,112
Construction in progress |  |
Fixed assets, at cost | 104,592 | 151,768
Other |  |
Fixed assets, at cost | $ 51,597 | $ 48,891

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