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Shareholders' Equity and Partners' Capital (Common Stock Sold) (Details) (Common Stock [Member], USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2013 | Mar. 01, 2013
Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock offering, maximum aggregate price |  |  |  | $ 300,000,000
Common stock offering, maximum commission fee (percent) |  |  |  | 2.00%
Number of Shares Settled | 6,530,193 | 1,889,105 | 8,419,298 |
Gross Proceeds | 167,034,000 | 44,459,000 | 211,493,000 |
Net Proceeds | 165,692,000 | 43,904,000 | 209,596,000 |
Weighted-average Sales Price | $ 25.58 | $ 23.53 | $ 25.12 |
Common stock offering, maximum remaining aggregate price |  |  | $ 88,507,000 |

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