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Partners' Capital and Distributions (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  | 12 Months Ended | 0 Months Ended |  |  |  | 12 Months Ended | 1 Months Ended
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Sep. 16, 2013 | Mar. 28, 2012 | Jul. 31, 2011 | Dec. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2014 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 Waiver Units Class1 [Member] | Dec. 31, 2013 Waiver Units Class 2 [Member] | Dec. 31, 2013 Waiver Units Class 3 [Member] | Dec. 31, 2013 Waiver Units Class4 [Member] | Sep. 16, 2013 Class A [Member] | Mar. 28, 2012 Class A [Member] | Dec. 31, 2013 Class A [Member] | Feb. 01, 2012 Class A [Member] | Dec. 31, 2013 Class B [Member] | Dec. 31, 2013 Waiver Units [Member] | Dec. 31, 2013 Class Two [Member] | Dec. 31, 2013 Class Three [Member] | Dec. 31, 2013 Class Four [Member] | Jul. 31, 2011 FMT Black Oil Barge Transportation Business [Member] Class A [Member]
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common units, outstanding |  |  |  | 88,690,985 | 88,690,985 | 81,202,752 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 88,650,988 |  | 39,997 |  |  |  |  |
Waiver units authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,738,000 | 1,738,000 | 1,738,000 | 1,738,000 |  |  |  |  |  | 1,738,233 |  |  |  |
Conversion feature, minimum distribution coverage ratio |  |  |  |  | 1.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.1 | 1.1 | 1.1 |
Conversion feature threshold, quarterly distribution, minimum, per unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.49 | 0.52 |
Waiver Units Class 3 Convertible Date |  |  |  | May 15, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per Unit Amount |  |  |  | $ 0.5225 | $ 0.5225 | $ 0.4725 |  | $ 0.5350 | $ 0.5100 | $ 0.4975 | $ 0.4850 | $ 0.4600 | $ 0.4500 | $ 0.4400 |  |  |  |  |  |  |  |  |  |  |  | $ 0.4975 |  |
Limited Partners' ownership percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common units issued | 5,750,000 |  |  | 88,690,985 | 88,690,985 | 81,202,752 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,750,000 |  |  |  |  |  | 7,350,000
Cash or stock available for distributions, percent usually distributed |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Days to distribute |  |  |  |  | 45 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price per share of common units issued | $ 47.51 | $ 30.80 | $ 26.30 |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  | $ 30.80 |  |  |  |  |  |  |  |
Proceeds received from offering, net of costs | $ 263,574 | $ 169,421 | $ 184,969 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 263,600 | $ 169,400 |  |  |  |  |  |  |  | $ 185,000
Issuance of common units for cash, net |  |  |  |  | $ 263,574 | $ 169,421 | $ 184,969 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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