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Long-Term Incentive Plan (Cash Flow Effects Of LTIP Settlements) (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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| Long Term Incentive Plan [Line Items] | |||
| Settlement of tax withholdings on long-term incentive compensation | $ 12,259,000 | $ 13,001,000 | $ 7,410,000 |
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Management [Member]
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| Long Term Incentive Plan [Line Items] | |||
| Partners' Capital Account, Units, Unit-based Compensation | 476,682 | 722,766 | 505,492 |
| Settlement of tax withholdings on long-term incentive compensation | 12,300,000 | 13,000,000 | 7,400,000 |
| Payments for Other Taxes | 1,100,000 | 1,300,000 | 900,000 |
| Total Cash Taxes Paid (in millions) | $ 13,400,000 | $ 14,300,000 | $ 8,300,000 |