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Benefit Plans - Valuation Assumptions (Details) - LTIP Unit Awards | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expected dividend yield | 1.99% | 2.22%
Expected volatility - weighted average | 21.34% | 30.61%
Expected term | 3 years |
Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expected volatility - range used | 20.43% | 24.28%
Risk-free interest rate | 0.10% | 0.03%
Expected term |  | 1 year
Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expected volatility - range used | 21.99% | 34.66%
Risk-free interest rate | 1.16% | 0.71%
Expected term |  | 2 years 6 months

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