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Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 15,568 | $ 9,462 | $ 16,925 | $ 16,925 | $ 8,866
Other current assets | 329,828 | 345,904 |  |  |
Total current assets | 345,396 | 355,366 |  |  |
Fixed Assets, at cost | 4,163,909 | 1,899,058 |  |  |
Less: Accumulated depreciation | (337,087) | (268,057) |  |  |
Net fixed assets | 3,826,822 | 1,631,001 |  |  |
Goodwill | 325,046 | 325,046 |  |  |
Other assets, net | 458,791 | 290,181 |  |  |
Advances to Affiliate | 0 | 0 |  |  |
Equity investees | 493,190 | 628,780 |  |  |
Investments in subsidiaries | 0 | 0 |  |  |
TOTAL ASSETS | 5,449,245 | 3,230,374 |  |  |
Current liabilities | 326,106 | 363,145 |  |  |
Senior secured credit facility | 1,014,100 | 550,400 |  |  |
Senior unsecured notes | 1,839,933 | 1,050,639 |  |  |
Deferred tax liabilities | 20,997 | 18,754 |  |  |
Due to Affiliate | 0 | 0 |  |  |
Other liabilities | 182,915 | 18,233 |  |  |
Total liabilities | 3,384,051 | 2,001,171 |  |  |
Limited Partners' Capital Account | 2,065,194 | 1,229,203 |  |  |
Partners' Capital, Including Portion Attributable to Noncontrolling Interest | 2,072,030 | 1,229,203 |  |  |
Partners' Capital Attributable to Noncontrolling Interest | (6,836) | 0 |  |  |
TOTAL LIABILITIES AND PARTNERS' CAPITAL | 5,449,245 | 3,230,374 |  |  |
Genesis Energy, L.P. (Parent And Co-Issuer) [Member] |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Cash and cash equivalents | 6 | 9 | 9 |  | 20
Other current assets | 75 | 53 |  |  |
Total current assets | 81 | 62 |  |  |
Fixed Assets, at cost | 0 | 0 |  |  |
Less: Accumulated depreciation | 0 | 0 |  |  |
Net fixed assets | 0 | 0 |  |  |
Goodwill | 0 | 0 |  |  |
Other assets, net | 47,919 | 28,421 |  |  |
Advances to Affiliate | 2,543,341 | 1,378,520 |  |  |
Equity investees | 0 | 0 |  |  |
Investments in subsidiaries | 2,362,919 | 1,434,255 |  |  |
TOTAL ASSETS | 4,954,260 | 2,841,258 |  |  |
Current liabilities | 28,197 | 11,016 |  |  |
Senior secured credit facility | 1,014,100 | 550,400 |  |  |
Senior unsecured notes | 1,839,933 | 1,050,639 |  |  |
Deferred tax liabilities | 0 | 0 |  |  |
Due to Affiliate | 0 | 0 |  |  |
Other liabilities | 0 | 0 |  |  |
Total liabilities | 2,882,230 | 1,612,055 |  |  |
Limited Partners' Capital Account |  | 1,229,203 |  |  |
Partners' Capital, Including Portion Attributable to Noncontrolling Interest | 2,072,030 |  |  |  |
Partners' Capital Attributable to Noncontrolling Interest | 0 |  |  |  |
TOTAL LIABILITIES AND PARTNERS' CAPITAL | 4,954,260 | 2,841,258 |  |  |
Genesis Energy Finance Corporation (Co-Issuer) [Member] |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 |  | 0
Other current assets | 0 | 0 |  |  |
Total current assets | 0 | 0 |  |  |
Fixed Assets, at cost | 0 | 0 |  |  |
Less: Accumulated depreciation | 0 | 0 |  |  |
Net fixed assets | 0 | 0 |  |  |
Goodwill | 0 | 0 |  |  |
Other assets, net | 0 | 0 |  |  |
Advances to Affiliate | 0 | 0 |  |  |
Equity investees | 0 | 0 |  |  |
Investments in subsidiaries | 0 | 0 |  |  |
TOTAL ASSETS | 0 | 0 |  |  |
Current liabilities | 0 | 0 |  |  |
Senior secured credit facility | 0 | 0 |  |  |
Senior unsecured notes | 0 | 0 |  |  |
Deferred tax liabilities | 0 | 0 |  |  |
Due to Affiliate | 0 | 0 |  |  |
Other liabilities | 0 | 0 |  |  |
Total liabilities | 0 | 0 |  |  |
Limited Partners' Capital Account |  | 0 |  |  |
Partners' Capital, Including Portion Attributable to Noncontrolling Interest | 0 |  |  |  |
Partners' Capital Attributable to Noncontrolling Interest | 0 |  |  |  |
TOTAL LIABILITIES AND PARTNERS' CAPITAL | 0 | 0 |  |  |
Guarantor Subsidiaries [Member] |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Cash and cash equivalents | 13,044 | 8,310 | 16,282 |  | 8,050
Other current assets | 317,334 | 333,385 |  |  |
Total current assets | 330,378 | 341,695 |  |  |
Fixed Assets, at cost | 4,086,318 | 1,823,556 |  |  |
Less: Accumulated depreciation | (318,312) | (251,171) |  |  |
Net fixed assets | 3,768,006 | 1,572,385 |  |  |
Goodwill | 325,046 | 325,046 |  |  |
Other assets, net | 418,936 | 269,252 |  |  |
Advances to Affiliate | 0 | 0 |  |  |
Equity investees | 493,190 | 628,780 |  |  |
Investments in subsidiaries | 95,587 | 97,195 |  |  |
TOTAL ASSETS | 5,431,143 | 3,234,353 |  |  |
Current liabilities | 318,185 | 395,159 |  |  |
Senior secured credit facility | 0 | 0 |  |  |
Senior unsecured notes | 0 | 0 |  |  |
Deferred tax liabilities | 20,997 | 18,754 |  |  |
Due to Affiliate | 2,582,282 | 1,366,697 |  |  |
Other liabilities | 152,191 | 18,233 |  |  |
Total liabilities | 3,073,655 | 1,798,843 |  |  |
Limited Partners' Capital Account |  | 1,435,510 |  |  |
Partners' Capital, Including Portion Attributable to Noncontrolling Interest | 2,357,488 |  |  |  |
Partners' Capital Attributable to Noncontrolling Interest | 0 |  |  |  |
TOTAL LIABILITIES AND PARTNERS' CAPITAL | 5,431,143 | 3,234,353 |  |  |
Non-Guarantor Subsidiaries [Member] |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Cash and cash equivalents | 2,518 | 1,143 | 634 |  | 796
Other current assets | 12,428 | 12,474 |  |  |
Total current assets | 14,946 | 13,617 |  |  |
Fixed Assets, at cost | 77,591 | 75,502 |  |  |
Less: Accumulated depreciation | (18,775) | (16,886) |  |  |
Net fixed assets | 58,816 | 58,616 |  |  |
Goodwill | 0 | 0 |  |  |
Other assets, net | 142,038 | 146,700 |  |  |
Advances to Affiliate | 38,941 | 0 |  |  |
Equity investees | 0 | 0 |  |  |
Investments in subsidiaries | 0 | 0 |  |  |
TOTAL ASSETS | 254,741 | 218,933 |  |  |
Current liabilities | 7,749 | 499 |  |  |
Senior secured credit facility | 0 | 0 |  |  |
Senior unsecured notes | 0 | 0 |  |  |
Deferred tax liabilities | 0 | 0 |  |  |
Due to Affiliate | 0 | 11,823 |  |  |
Other liabilities | 152,802 | 110,663 |  |  |
Total liabilities | 160,551 | 122,985 |  |  |
Limited Partners' Capital Account |  | 95,948 |  |  |
Partners' Capital, Including Portion Attributable to Noncontrolling Interest | 101,026 |  |  |  |
Partners' Capital Attributable to Noncontrolling Interest | (6,836) |  |  |  |
TOTAL LIABILITIES AND PARTNERS' CAPITAL | 254,741 | 218,933 |  |  |
Eliminations [Member] |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Cash and cash equivalents | 0 | 0 | $ 0 |  | $ 0
Other current assets | (9) | (8) |  |  |
Total current assets | (9) | (8) |  |  |
Fixed Assets, at cost | 0 | 0 |  |  |
Less: Accumulated depreciation | 0 | 0 |  |  |
Net fixed assets | 0 | 0 |  |  |
Goodwill | 0 | 0 |  |  |
Other assets, net | (150,102) | (154,192) |  |  |
Advances to Affiliate | (2,582,282) | (1,378,520) |  |  |
Equity investees | 0 | 0 |  |  |
Investments in subsidiaries | (2,458,506) | (1,531,450) |  |  |
TOTAL ASSETS | (5,190,899) | (3,064,170) |  |  |
Current liabilities | (28,025) | (43,529) |  |  |
Senior secured credit facility | 0 | 0 |  |  |
Senior unsecured notes | 0 | 0 |  |  |
Deferred tax liabilities | 0 | 0 |  |  |
Due to Affiliate | (2,582,282) | (1,378,520) |  |  |
Other liabilities | (122,078) | (110,663) |  |  |
Total liabilities | (2,732,385) | (1,532,712) |  |  |
Limited Partners' Capital Account |  | (1,531,458) |  |  |
Partners' Capital, Including Portion Attributable to Noncontrolling Interest | (2,458,514) |  |  |  |
Partners' Capital Attributable to Noncontrolling Interest | 0 |  |  |  |
TOTAL LIABILITIES AND PARTNERS' CAPITAL | $ (5,190,899) | $ (3,064,170) |  |  |

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