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PARTNERS' EQUITY Narrative 1 (Details) (USD $)
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12 Months Ended | ||
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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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| Issuances Of Common Units [Line Items] | |||
| Net proceeds | $ 343,860,000 | $ 323,993,000 | |
| General Partner Ownership Interest | 2.00% | 2.00% | 2.00% |
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Limited Partner [Member]
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| Issuances Of Common Units [Line Items] | |||
| Number of common units issued | 7,130,000 | 6,145,529 | |
| Net proceeds | 336,739,000 | 317,285,000 | |
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General Partner [Member]
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| Issuances Of Common Units [Line Items] | |||
| Net proceeds | 7,121,000 | 6,708,000 | |
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Equity Issuance 2012 [Member]
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| Issuances Of Common Units [Line Items] | |||
| Date of Issuance | Sep. 10, 2012 | ||
| Sale Price Per Unit | $ 48.94 | ||
| Net proceeds | 343,900,000 | ||
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Equity Issuance 2012 [Member] | Limited Partner [Member]
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| Issuances Of Common Units [Line Items] | |||
| Number of common units issued | 7,130,000 | ||
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Equity Issuance 2012 [Member] | General Partner [Member]
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| Issuances Of Common Units [Line Items] | |||
| Net proceeds | 7,100,000 | ||
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Equity Issuance 2011 No 2 [Member]
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| Issuances Of Common Units [Line Items] | |||
| Date of Issuance | Dec. 09, 2011 | ||
| Sale Price Per Unit | $ 53.45 | ||
| Net proceeds | 318,000,000 | ||
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Equity Issuance 2011 No 2 [Member] | Limited Partner [Member]
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| Issuances Of Common Units [Line Items] | |||
| Number of common units issued | 6,037,500 | ||
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Equity Issuance 2011 No 2 [Member] | General Partner [Member]
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| Issuances Of Common Units [Line Items] | |||
| Net proceeds | 6,600,000 | ||
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Equity Issuance 2011 No 1 [Member]
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| Issuances Of Common Units [Line Items] | |||
| Net proceeds | 6,000,000 | ||
| Maximum amount that can be sold under equity agreement | 200,000,000 | ||
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Equity Issuance 2011 No 1 [Member] | Limited Partner [Member]
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| Issuances Of Common Units [Line Items] | |||
| Number of common units issued | 108,029 | ||
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Equity Issuance 2011 No 1 [Member] | General Partner [Member]
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| Issuances Of Common Units [Line Items] | |||
| Net proceeds | $ 100,000 | ||