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Equity - Additional Information (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) shares | Jul. 31, 2015 shares
Equity [Line Items] |  |  |  |
Common stock, shares, issued | 254,770,719 | 235,008,554 |  |
Proceeds from issuance of common shares | $ | $ 197,643,000 | $ (2,818,000) | $ 16,804,000 |
Preferred shares outstanding (in shares) | 1,935,400 | 1,935,400 |  |
Shares issued, net of forfeitures (in shares) | 896,807 | 965,932 | 835,234 |
Remaining authorized repurchase amount | $ | $ 10,306,255 |  |  |
OP unit equivalent in common shares (in unit per share) | 1.13 |  |  |
Shares issued for units redeemed (in shares) | 391,993 | 53,388 | 140,746 |
Partners' capital account, exchanges and conversions | $ | $ 1,655,000 | $ 189,000 | $ 584,000 |
OP units outstanding (in units) | 2,829,000 |  |  |
Unsettled repurchases | $ |  | $ 2,641,000 |  |
Common Stock |  |  |  |
Equity [Line Items] |  |  |  |
Number of shares authorized to be repurchased (in shares) |  | 10,000,000 |  | 10,000,000
Repurchase of common shares (in shares) | 441,581 | 5,851,252 | 0 |
Average cost per share (usd per share) | $ / shares | $ 8.13 | $ 8.05 |  |
Series C |  |  |  |
Equity [Line Items] |  |  |  |
Preferred shares outstanding (in shares) | 1,935,400 |  |  |
Dividend rate (usd per share) | $ / shares | $ 3.25 |  |  |
Preferred shares, liquidation preference | $ | $ 96,770,000 |  |  |
Preferred shares to common shares conversion ratio | 2.4339 |  |  |
Series C | Minimum |  |  |  |
Equity [Line Items] |  |  |  |
Common share closing price percent of conversion price | 125.00% |  |  |
At The Market |  |  |  |
Equity [Line Items] |  |  |  |
Common stock, shares, issued | 9,668,748 | 0 | 1,593,603 |
Proceeds from issuance of common shares | $ | $ 102,299,000 |  | $ 17,362,000 |
Sale of stock, amount available for issuance | $ | $ 296,076,000 |  |  |
Underwritten Offering |  |  |  |
Equity [Line Items] |  |  |  |
Common stock, shares, issued | 10,000,000 |  |  |
Proceeds from issuance of common shares | $ | $ 100,749,000 |  |  |
Underwritten Offering | Common Stock |  |  |  |
Equity [Line Items] |  |  |  |
Shares issued, price per share | $ / shares | $ 10.09 |  |  |

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