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Equity - Additional Information (Details) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) $ / shares shares | Dec. 31, 2018 shares | Jul. 31, 2015 shares
Equity [Line Items] |  |  |  |
Common shares, shares issued (in shares) | shares | 247,856,209 |  | 235,008,554 |
Issuance of common shares, net | $ | $ 131,831,000 | $ 0 |  |
Authorized amount (in shares) | shares |  |  | 10,000,000 | 10,000,000
Treasury stock acquired (in shares) | shares | 441,581 | 1,871,655 |  |
Treasury stock acquired, average cost (in dollars per share) | $ / shares | $ 8.13 | $ 8.01 |  |
Shares remaining available for repurchase (in shares) | $ | $ 10,306,255 |  |  |
OP unit equivalent in common shares | 1.13 |  |  |
Partners' capital account (in units) | shares | 3,051,000 |  |  |
Share-based Payment Arrangement |  |  |  |
Equity [Line Items] |  |  |  |
Shares granted (in shares) | shares | 54,726 | 57,055 |  |
Grant date fair value | $ | $ 470,000 | $ 518,000 |  |
At The Market |  |  |  |
Equity [Line Items] |  |  |  |
Sale of stock, authorized amount (up to) | $ | $ 100,000,000 |  |  |
Common shares, shares issued (in shares) | shares | 3,020,190 | 0 |  |
Issuance of common shares, net | $ | $ 31,083,000 |  |  |
Common shares amount available for issuance | $ | $ 68,366,000 |  |  |
Underwritten Offering |  |  |  |
Equity [Line Items] |  |  |  |
Common shares, shares issued (in shares) | shares | 10,000,000 |  |  |
Issuance of common shares, net | $ | $ 100,749,000 |  |  |
Common Stock | Underwritten Offering |  |  |  |
Equity [Line Items] |  |  |  |
Common shares, price per share (in dollars per share) | $ / shares | $ 10.09 |  |  |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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