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Equity and Capital (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Mar. 01, 2013
Targeted or Tracking Stock, Stock [Line Items] |  |  |
Common stock offering, maximum aggregate price (up to) |  |  | $ 300,000,000
Commission to sales agent, maximum |  |  | 2.00%
Number of shares settled (in shares) | 342,008 | 331,324 |
Common stock offering, maximum aggregate price still available | $ 88,507,000 |  |
At The Market Stock Sales |  |  |
Targeted or Tracking Stock, Stock [Line Items] |  |  |
Number of shares settled (in shares) | 8,419,298.000 |  |
Weighted-average sales price (in dollars per share) | $ 25.12 |  |

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