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Capital Stock (Details) |  |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 12, 2016 $ / shares | Apr. 12, 2016 $ / shares | Jan. 12, 2016 $ / shares | Jun. 30, 2016 USD ($) $ / shares shares | Dec. 31, 2015 $ / shares shares | Nov. 30, 2015 USD ($)
Dividends Payable [Line Items] |  |  |  |  |  |
Common stock, shares authorized (up to) | shares |  |  |  | 400,000,000 | 400,000,000 |
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.01 | $ 0.01 |
Dividends per Share (in dollars per share) | $ / shares |  | $ 0.1250 | $ 0.1250 |  |  |
Preferred stock, shares authorized (up to) | shares |  |  |  | 10,000,000 | 10,000,000 |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.01 | $ 0.01 |
Preferred Stock, shares outstanding | shares |  |  |  | 0 | 0 |
Common stock partnership units option redemption ratio |  |  |  | 1 |  |
Unaffiliated Third Parties |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Operating partnerships units held (in shares) | shares |  |  |  | 0 | 0 |
Common Stock |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Aggregate offering price (up to) | $ |  |  |  | $ 200,000,000 |  |
Remaining amount under ATM program | $ |  |  |  | $ 128,300,000 |  |
Value amount of shares authorized to be repurchased (up to) | $ |  |  |  |  |  | $ 150,000,000
Subsequent Event |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Dividends per Share (in dollars per share) | $ / shares | $ 0.1250 |  |  |  |  |

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