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Revenue Recognition (Impact on Balance Sheet and Operating Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
ASSETS |  |  |  |  |  |
Accounts receivable - trade, net | $ 365,646 |  | $ 365,646 |  | $ 447,421 | $ 495,449
Inventories | 85,722 |  | 85,722 |  | 93,791 | 88,653
Other assets, net of amortization | 120,102 |  | 120,102 |  | 115,832 | 56,628
LIABILITIES AND CAPITAL |  |  |  |  |  |
Other long-term liabilities | 275,823 |  | 275,823 |  | 276,435 | 256,571
Partners' capital | 1,799,409 |  | 1,799,409 |  | 2,022,597 | $ 2,026,147
OPERATING INCOME |  |  |  |  |  |
Total revenues | 745,278 |  | 2,223,474 |  |  |
Operating Income | 46,148 | $ 43,100 | 166,129 | $ 157,144 |  |
Offshore Pipeline Transportation |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |
Total revenues | 70,115 |  | 213,344 |  |  |
Cost of revenues | 17,753 |  | 53,533 |  |  |
Sodium Minerals & Sulfur Services |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |
Total revenues | 291,722 |  | 876,513 |  |  |
Cost of revenues | 229,204 |  | 685,219 |  |  |
Marine Transportation |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |
Total revenues | 56,296 |  | 161,410 |  |  |
Cost of revenues | 44,195 |  | 126,259 |  |  |
Onshore facilities and transportation |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |
Total revenues | 327,145 |  | 972,207 |  |  |
Onshore facilities and transportation | Onshore facilities and transportation product costs |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |
Cost of revenues | 273,251 |  | 834,128 |  |  |
Onshore facilities and transportation | Onshore facilities and transportation operating costs |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |
Cost of revenues | 22,005 |  | 67,346 |  |  |
Effect of Change Increase/(Decrease) |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |
Total revenues | 24,307 |  | 80,461 |  |  |
Operating Income | (884) |  | 2,527 |  |  |
Effect of Change Increase/(Decrease) | Offshore Pipeline Transportation |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |
Total revenues | 792 |  | 5,271 |  |  |
Cost of revenues | 0 |  | 0 |  |  |
Effect of Change Increase/(Decrease) | Sodium Minerals & Sulfur Services |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |
Total revenues | 23,515 |  | 75,190 |  |  |
Cost of revenues | 25,191 |  | 77,934 |  |  |
Effect of Change Increase/(Decrease) | Marine Transportation |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |
Total revenues | 0 |  | 0 |  |  |
Cost of revenues | 0 |  | 0 |  |  |
Effect of Change Increase/(Decrease) | Onshore facilities and transportation |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |
Total revenues | 0 |  | 0 |  |  |
Effect of Change Increase/(Decrease) | Onshore facilities and transportation | Onshore facilities and transportation product costs |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |
Cost of revenues | 0 |  | 0 |  |  |
Effect of Change Increase/(Decrease) | Onshore facilities and transportation | Onshore facilities and transportation operating costs |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |
Cost of revenues | 0 |  | 0 |  |  |
Accounting Standards Update 2014-09 | Adjustments |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Accounts receivable - trade, net | 413,674 |  | 413,674 |  |  |
Inventories | 83,329 |  | 83,329 |  |  |
Other assets, net of amortization | 50,742 |  | 50,742 |  |  |
LIABILITIES AND CAPITAL |  |  |  |  |  |
Other long-term liabilities | 251,075 |  | 251,075 |  |  |
Partners' capital | 1,800,432 |  | 1,800,432 |  |  |
OPERATING INCOME |  |  |  |  |  |
Total revenues | 720,971 |  | 2,143,013 |  |  |
Operating Income | 47,032 |  | 163,602 |  |  |
Accounting Standards Update 2014-09 | Adjustments | Offshore Pipeline Transportation |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |
Total revenues | 69,323 |  | 208,073 |  |  |
Cost of revenues | 17,753 |  | 53,533 |  |  |
Accounting Standards Update 2014-09 | Adjustments | Sodium Minerals & Sulfur Services |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |
Total revenues | 268,207 |  | 801,323 |  |  |
Cost of revenues | 204,013 |  | 607,285 |  |  |
Accounting Standards Update 2014-09 | Adjustments | Marine Transportation |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |
Total revenues | 56,296 |  | 161,410 |  |  |
Cost of revenues | 44,195 |  | 126,259 |  |  |
Accounting Standards Update 2014-09 | Adjustments | Onshore facilities and transportation |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |
Total revenues | 327,145 |  | 972,207 |  |  |
Accounting Standards Update 2014-09 | Adjustments | Onshore facilities and transportation | Onshore facilities and transportation product costs |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |
Cost of revenues | 273,251 |  | 834,128 |  |  |
Accounting Standards Update 2014-09 | Adjustments | Onshore facilities and transportation | Onshore facilities and transportation operating costs |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |
Cost of revenues | 22,005 |  | 67,346 |  |  |
Accounting Standards Update 2014-09 | Effect of Change Increase/(Decrease) |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Accounts receivable - trade, net | (48,028) |  | (48,028) |  | (48,028) |
Inventories | 2,393 |  | 2,393 |  | 5,138 |
Other assets, net of amortization | 69,360 |  | 69,360 |  | 59,204 |
LIABILITIES AND CAPITAL |  |  |  |  |  |
Other long-term liabilities | 24,748 |  | 24,748 |  | 19,864 |
Partners' capital | $ (1,023) |  | $ (1,023) |  | $ (3,550) |

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