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Capital Stock (Details) |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 12, 2016 $ / shares | Dec. 31, 2015 USD ($) $ / shares shares | Oct. 13, 2015 $ / shares | Sep. 30, 2015 | Jul. 14, 2015 $ / shares | Jun. 30, 2015 | Apr. 10, 2015 $ / shares | Mar. 31, 2015 | Jan. 12, 2015 $ / shares | Oct. 10, 2014 $ / shares | Jul. 10, 2014 $ / shares | Apr. 10, 2014 $ / shares | Jan. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) vote $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Nov. 30, 2014 USD ($)
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized | shares |  | 400,000,000 |  |  |  |  |  |  |  |  |  |  |  | 400,000,000 | 400,000,000 |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 |
Common stock votes | vote |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Stock issued during period, value, new issues | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,790,000 | $ 63,062,000 |
Payment Date |  |  | Oct. 13, 2015 |  | Jul. 14, 2015 |  | Apr. 10, 2015 |  | Jan. 12, 2015 | Oct. 10, 2014 | Jul. 10, 2014 | Apr. 10, 2014 |  |  |  |
Record Date |  | Dec. 31, 2015 |  | Sep. 30, 2015 |  | Jun. 30, 2015 |  | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 |  |  |  |
Dividends per common share (in dollars per share) | $ / shares |  |  | $ 0.1250 |  | $ 0.1250 |  | $ 0.125 |  | $ 0.1025 | $ 0.1025 | $ 0.1025 | $ 0.1025 |  |  |  |
Preferred stock, shares authorized | shares |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 | 10,000,000 |
Preferred stock, par value (in dollars per share) | $ / shares |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 |
Preferred stock, shares outstanding | shares |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Operating partnership units option to redeem for common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment Date | Jan. 12, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends per common share (in dollars per share) | $ / shares | $ 0.125 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unaffiliated Third Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units of partnership interest, amount | shares |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate offering price | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |
Common stock sold in offering | shares |  |  |  |  |  |  |  |  |  |  |  |  | 524,606 | 524,606 | 4,217,560 |
Share price of common stock sold | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 15.18 |  | $ 15.12 |
Stock issued during period, value, new issues | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,800,000 | $ 5,000 | $ 42,000 |
Remaining amount under ATM program | $ |  | $ 128,300,000 |  |  |  |  |  |  |  |  |  |  |  | $ 128,300,000 |  |
Amount authorized to be repurchased | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000

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