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Equity and Capital (Details) (USD $) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Mar. 01, 2013
Targeted or Tracking Stock, Stock [Line Items] |  |  |
Common stock offering, maximum aggregate price |  |  | $ 300,000,000
Commission to sales agent, maximum (percent) |  |  | 2.00%
Number of shares settled | 243,648 | 8,635,715 |
Gross proceeds | 639,000 | 209,531,000 |
Net proceeds | 131,000 | 209,510,000 |
Common stock offering, maximum aggregate price still available | 88,507,000 |  |
At The Market Stock Sales [Member] |  |  |
Targeted or Tracking Stock, Stock [Line Items] |  |  |
Number of shares settled |  | 8,419,298.000 |
Gross proceeds |  | 211,493,000 |
Net proceeds |  | $ 209,596,000 |
Weighted-average sales price (in dollars per share) |  | $ 25.12 |

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