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Earnings (Loss) Per Share and Equity Transactions - Reconciliation of Amounts Used in Calculating Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net Income (Loss) Attributable to Parent [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations | $ 8,285 | $ 12,243 | $ 34,753 | $ 2,673 | $ 22,904 | $ 28,501 | $ 50,418 | $ 17,376 | $ 57,954 | $ 119,199 | $ (25,300)
Dividends |  |  |  |  |  |  |  |  | (53,758) | (83,633) | (138,614)
Undistributed income allocated to unvested shares |  |  |  |  |  |  |  |  | (15) | (10) | 0
Undistributed income (loss) |  |  |  |  |  |  |  |  | 4,181 | 35,556 | (163,914)
Distributed and undistributed income (loss) from continuing operations, basic and diluted |  |  |  |  |  |  |  |  | 57,939 | 119,189 | (25,300)
Net income from discontinued operations | $ (4,474) | $ 9,722 | $ (833) | $ (576) | $ 3,390 | $ 8,819 | $ 113,283 | $ 8,031 | $ 3,839 | $ 133,523 | $ 28,764
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding, basic and diluted (in shares) |  |  |  |  |  |  |  |  | 773,445,341 | 854,638,497 | 861,830,627
Earnings Per Share, Basic and Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations allocated to common shareholders per share (in usd per share): |  |  |  |  |  |  |  |  | $ 0.07 | $ 0.14 | $ (0.03)
Income from discontinued operations allocated to common shareholders per share (in usd per share): |  |  |  |  |  |  |  |  | $ 0.00 | $ 0.15 | $ 0.04
Accumulated Distributions in excess of Net Loss [Member] |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |  | $ (53,758) | $ (83,633) | $ (138,614)

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