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Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Preferred OP Units (Details) | 3 Months Ended | 12 Months Ended | 27 Months Ended | 231 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) $ / Units shares | Dec. 31, 2016 $ / shares shares | Dec. 31, 1999 shares | Mar. 31, 2018 USD ($) $ / Units shares | Mar. 31, 2018 USD ($) $ / Units shares | Dec. 31, 2017 shares
Class of Stock [Line Items] |  |  |  |  |  |
Denominator for Series A Preferred OP Unit conversion | $ | $ 7.50 |  |  | $ 7.50 | $ 7.50 |
Preferred OP Units |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Issuance of common shares, net of issuance costs (in Shares) | 0 |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Issuance of common shares, net of issuance costs (in Shares) |  |  | 1,580 |  |  |
Preferred stock, stated value per unit | $ / Units | 1,000 |  |  |  |  |
Per unit conversion amount, Series A Preferred OP Units (in dollars per unit) | $ / Units | 22.50 |  |  | 22.50 | 22.50 |
Per unit conversion annual rate, Preferred OP Units | 9.00% |  |  | 9.00% | 9.00% |
Number of preferred OP Units converted (in shares) |  |  |  |  | 1,392 |
Units converted from Preferred OP Units (in shares) |  |  |  |  | 185,600 |
Operating Partnership, as General Partner or Managing Member |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred OP Units (in shares) | 3,328,873 |  |  | 3,328,873 | 3,328,873 | 3,328,873
Operating Partnership, as General Partner or Managing Member | Series A Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred OP Units (in shares) | 188 |  |  | 188 | 188 | 188
Operating Partnership, as General Partner or Managing Member | Series C Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred OP Units (in shares) | 136,593 |  |  | 136,593 | 136,593 | 136,593
Gotham Plaza | Preferred OP Units |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Issuance of common shares, net of issuance costs (in Shares) |  | 141,593 |  |  |  |
Gotham Plaza | Series C Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of preferred OP Units converted (in shares) |  |  |  | 5,000 |  |
Units converted from Preferred OP Units (in shares) |  |  |  | 17,165 |  |
Gotham Plaza | Common Shares |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Issuance of common shares, net of issuance costs (in Shares) |  | 442,478 |  |  |  |
Share price (in dollars per share) | $ / shares |  | $ 100.00 |  |  |  |
Preferred quarterly distribution per share price | $ / shares |  | $ 0.9375 |  |  |  |
Number of convertible units if share price falls below $28.80 (in shares) |  | 3.4722 |  |  |  |
Number of convertible units of share price falls above $35.20 (in Shares) |  | 2.8409 |  |  |  |
Minimum | Gotham Plaza | Preferred OP Units |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Share price at conversion date | $ / shares |  | $ 28.80 |  |  |  |
Maximum | Gotham Plaza | Preferred OP Units |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Share price at conversion date | $ / shares |  | $ 35.20 |  |  |  |

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