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Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 9 Months Ended |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Mar. 01, 2013 | Sep. 30, 2013 At The Market Stock Sales [Member] | Jun. 30, 2013 At The Market Stock Sales [Member] | Mar. 31, 2013 At The Market Stock Sales [Member] | Sep. 30, 2013 At The Market Stock Sales [Member]
Targeted or Tracking Stock, Stock [Line Items] |  |  |  |  |  |  |
Common Stock Offering, Maximum Aggregate Price |  |  | $ 300,000 |  |  |  |
number of shares sold |  |  |  | 0 | 6,530,193 | 1,889,105 | 8,419,298
Gross Proceeds from sale of common stock |  |  |  | 0 | 167,034 | 44,459 | 211,493
Proceeds from issuances of common stock | 209,510 | 128 |  | 0 | 165,692 | 43,904 | 209,596
proceeds from sale of common stock weighted average price per share |  |  |  | $ 0.00 | $ 25.58 | $ 23.53 | $ 25.12
Commission To Sales Agent, Percent |  |  | 2.00% |  |  |  |
Stock Issued During Period, Shares, New Issues | 8,419,298 |  |  |  |  |  |
Common Stock Offering Maximum Aggregate Price Still Available | $ 88,507 |  |  |  |  |  |

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