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Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Preferred OP Units (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) $ / Units shares | Sep. 30, 2016 $ / shares shares | Dec. 31, 2016 shares | Dec. 31, 1999 shares
Class of Stock [Line Items] |  |  |  |
Limited partners' capital account, units issued and converted (in shares) | 61,150 | 350,240 |  |
Units converted from Series A Preferred OP Units (in shares) | 185,600 |  |  |
Denominator for Series A Preferred OP Unit conversion | $ | $ 7.50 |  |  |
Preferred OP Units [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Issuance of common shares, net of issuance costs (in Shares) | 0 |  |  |
Series C Preferred OP Units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Issuance of common shares, net of issuance costs (in Shares) | 1,250 |  |  |
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 |  |  |
Per unit conversion annual rate, Preferred OP Units | 9.00% |  |  |
Limited partners' capital account, units issued and converted (in shares) | 1,392 |  |  |
Common Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Issuance of common shares, net of issuance costs (in Shares) |  |  | 4,830,000 |
Operating Partnership, as General Partner or Managing Member |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred OP Units (in shares) | 3,341,397 | 3,308,875 |  |
Operating Partnership, as General Partner or Managing Member | Series A Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred OP Units (in shares) | 188 | 188 |  |
Gotham Plaza | Preferred OP Units [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Issuance of common shares, net of issuance costs (in Shares) |  | 141,593 |  |
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 convertiable units of share price falls above $35.20 (in Shares) |  | 2.8409 |  |
Minimum | Gotham Plaza | Preferred OP Units [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Share price at conversion date | $ / shares |  | $ 28.80 |  |
Maximum | Gotham Plaza | Preferred OP Units [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Share price at conversion date | $ / shares |  | $ 35.20 |  |

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