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PARTNERS' CAPITAL AND MEMBERSHIP INTERESTS (Cash Distributions) (Details) (USD $)
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0 Months Ended | 12 Months Ended | 0 Months Ended | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Nov. 14, 2013
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Aug. 14, 2013
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May 15, 2013
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Feb. 14, 2013
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Feb. 14, 2014
Subsequent Event
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Feb. 14, 2014
General partner
Subsequent Event
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Nov. 14, 2013
Limited partners, Common
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Aug. 14, 2013
Limited partners, Common
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May 15, 2013
Limited partners, Common
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Feb. 14, 2013
Limited partners, Common
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Feb. 14, 2014
Limited partners, Common
Subsequent Event
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Nov. 14, 2013
Subordinated
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Aug. 14, 2013
Subordinated
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May 15, 2013
Subordinated
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Feb. 14, 2013
Subordinated
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Feb. 14, 2014
Subordinated
Subsequent Event
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Nov. 14, 2013
General Partner Units
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Aug. 14, 2013
General Partner Units
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May 15, 2013
General Partner Units
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Feb. 14, 2013
General Partner Units
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Feb. 14, 2014
General Partner Units
Subsequent Event
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| Distribution Made to Limited Partner [Line Items] | ||||||||||||||||||||||||
| Per-unit distribution | $ 0.46 | $ 0.435 | $ 0.42 | $ 0.41 | $ 0.48 | |||||||||||||||||||
| Distributions to unitholders | $ 25,108,000 | $ 23,740,000 | $ 20,923,000 | $ 20,425,000 | $ 90,196,000 | $ 0 | $ 0 | $ 26,366,000 | $ 13,377,000 | $ 12,647,000 | $ 10,253,000 | $ 10,009,000 | $ 13,958,000 | $ 11,229,000 | $ 10,618,000 | $ 10,252,000 | $ 10,008,000 | $ 11,717,000 | $ 502,000 | $ 475,000 | $ 418,000 | $ 408,000 | $ 691,000 | |
| General partner's IDRs | $ 163,000 | |||||||||||||||||||||||