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Disposed Properties - Schedule of Discontinued Operations (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Assets |  |  |  |  |  |  |  |  |  |  |
Allowance for accounts and rents receivable | $ 49 |  |  |  |  |  |  |  | $ 49 |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |
Total liabilities | 0 |  |  |  | $ 60,413 |  |  |  | 0 | $ 60,413 |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total income |  |  |  |  |  |  |  |  | 3,935 | 92,329 | $ 265,076
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 1,205 | 32,667 | 77,736
Other expenses |  |  |  |  |  |  |  |  | 2,308 | 36,487 | 121,174
Provision for asset impairment |  |  |  |  |  |  |  |  | 0 | 106,514 | 0
Operating income (loss) from discontinued operations |  |  |  |  |  |  |  |  | 422 | (83,339) | 66,166
Interest expense, income taxes, and other miscellaneous income |  |  |  |  |  |  |  |  | (6,696) | (17,983) | (37,476)
Equity in earnings of unconsolidated entity |  |  |  |  |  |  |  |  | 0 | (19) | 89
Gain on sale of investment in unconsolidated entity |  |  |  |  |  |  |  |  | 0 | 1,434 | 0
Gain on sale of properties, net |  |  |  |  |  |  |  |  | 10,115 | 236,256 | 0
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | (2) | (2,826) | 0
Net income from discontinued operations |  |  |  |  |  |  |  |  | 3,839 | 133,523 | 28,779
Less net income attributable to non-controlling interests |  |  |  |  |  |  |  |  | 0 | 0 | (15)
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 common shares outstanding, basic and diluted (in shares) |  |  |  |  |  |  |  |  | 773,445,341 | 854,638,497 | 861,830,627
Net income, per common share, from discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.00 | $ 0.15 | $ 0.04
Discontinued Operations, Disposed of by Sale [Member] | Worldgate Plaza [Member] |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, gross |  |  |  |  | 42,567 |  |  |  |  | $ 42,567 |
Less accumulated depreciation |  |  |  |  | (2,601) |  |  |  |  | (2,601) |
Total |  |  |  |  | 39,966 |  |  |  |  | 39,966 |
Accounts and rents receivable (net of allowance of $49) |  |  |  |  | 1,566 |  |  |  |  | 1,566 |
Deferred costs and other assets |  |  |  |  | 903 |  |  |  |  | 903 |
Total assets |  |  |  |  | 42,435 |  |  |  |  | 42,435 |
Liabilities |  |  |  |  |  |  |  |  |  |  |
Debt, net |  |  |  |  | 59,942 |  |  |  |  | 59,942 |
Accounts payable and accrued expenses |  |  |  |  | 116 |  |  |  |  | 116 |
Other liabilities |  |  |  |  | 355 |  |  |  |  | 355 |
Total liabilities |  |  |  |  | 60,413 |  |  |  |  | 60,413 |
Discontinued Operations, Disposed of by Sale [Member] | Land [Member] | Worldgate Plaza [Member] |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, gross |  |  |  |  | 9,564 |  |  |  |  | 9,564 |
Discontinued Operations, Disposed of by Sale [Member] | Building and Building Improvements [Member] | Worldgate Plaza [Member] |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, gross |  |  |  |  | $ 33,003 |  |  |  |  | $ 33,003 |

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