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Real Estate Investments - Acquistions (Details) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |
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Oct. 02, 2014 USD ($) ft² | May. 02, 2014 USD ($) ft² | Mar. 26, 2014 USD ($) ft² | Dec. 31, 2015 USD ($) apartment | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) unit | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) apartment $ / shares | Dec. 31, 2014 USD ($) ft² note unit $ / shares | Dec. 31, 2013 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 unit | Jul. 01, 2015 USD ($) unit | Feb. 21, 2014 USD ($) unit | Oct. 02, 2013 USD ($) unit
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Payable |  |  |  |  |  |  |  | $ 414,500 |  |  |  |  | $ 414,500 |  | $ 414,546 |  |  |  |
Units |  |  |  | 506 |  |  |  |  |  |  |  | 506 |  |  |  | 3,258 |  |  |
Mortgage notes payable, net |  |  |  |  |  |  |  | 417,194 |  |  |  |  | 417,194 |  | 418,052 |  |  |  |
Real estate impairment |  |  |  |  |  | $ 5,900 |  |  |  |  |  | $ 5,909 | 0 | $ 0 |  |  |  |  |
Contract Purchase Price |  |  |  |  |  |  |  | 2,470,953 |  |  |  |  | 2,470,953 |  | 2,637,797 |  |  |  |
Real estate rental revenue |  |  |  | $ 79,102 | $ 78,243 | 74,226 | $ 74,856 | 74,359 | $ 73,413 | $ 72,254 | $ 68,611 | 306,427 | 288,637 | 263,024 |  |  |  |  |
Net loss |  |  |  | $ 62,095 | $ 580 | $ (2,886) | $ 29,398 | 2,309 | $ 3,658 | $ 1,080 | $ 104,554 | 89,187 | 111,601 | 37,346 |  |  |  |  |
Land |  |  |  |  |  |  |  |  |  |  |  | 30,548 | 104,403 | 8,568 |  |  |  |  |
Land Available for Development |  |  |  |  |  |  |  |  |  |  |  | 15,000 | 0 | 0 |  |  |  |  |
Buildings |  |  |  |  |  |  |  |  |  |  |  | 116,563 | 172,671 | 37,930 |  |  |  |  |
Tenant origination costs |  |  |  |  |  |  |  | 9,377 |  |  |  |  | 9,377 | 32 | 0 |  |  |  |
Leasing commissions/absorption costs |  |  |  |  |  |  |  | 16,474 |  |  |  |  | 16,474 | 943 | 4,889 |  |  |  |
Net lease intangible assets |  |  |  |  |  |  |  | 7,331 |  |  |  |  | 7,331 | 102 | 0 |  |  |  |
Net lease intangible liabilities |  |  |  |  |  |  |  | (8,323) |  |  |  |  | (8,323) | (117) | 0 |  |  |  |
Fair value of assumed mortgage |  |  |  |  |  |  |  | (107,125) |  |  |  |  | (107,125) | 0 | 0 |  |  |  |
Furniture, fixtures & equipment |  |  |  |  |  |  |  | 932 |  |  |  |  | 932 | 742 | 0 |  |  |  |
Payments to Acquire Real Estate |  |  |  |  |  |  |  |  |  |  |  | 151,682 | $ 194,536 | 48,200 |  |  |  |  |
Number of Mortgage Notes Assumed | note |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Notes Assumed |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,900 |  |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  |  |  |  |  |  |  |  |  |  |  | 313,114 | 302,120 |  |  |  |  |  |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax |  |  |  |  |  |  |  |  |  |  |  | 96,735 | 4,466 |  |  |  |  |  |
Business Acquisition, Pro Forma Net Income (Loss) |  |  |  |  |  |  |  |  |  |  |  | $ 96,735 | $ 110,997 |  |  |  |  |  |
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 1.41 | $ 1.66 |  |  |  |  |  |
Wellington [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units | unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 711 |  |
Yale West [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Payable |  |  |  |  |  |  |  | 47,903 |  |  |  |  | $ 47,903 |  | 47,502 |  |  |  |
Units | unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 216 |  | 216 |
Mortgage notes payable, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,900 |  |  |  |
The Army Navy Club Building [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Payable |  |  |  |  |  |  |  | $ 51,844 |  |  |  |  | $ 51,844 |  | 50,750 |  |  |  |
Mortgage notes payable, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,000 |  |  |  |
The Paramount [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units | unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 135 |  |  | 135
Property Acquired [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units | unit |  |  |  |  |  |  |  | 216 |  |  |  |  | 216 |  |  |  |  |  |
Rentable Square Feet | ft² |  |  |  |  |  |  |  |  |  |  |  |  | 368,000 |  |  |  |  |  |
Contract Purchase Price |  |  |  |  |  |  |  | $ 297,000 |  |  |  |  | $ 297,000 |  |  |  |  |  |
Real estate rental revenue |  |  |  |  |  |  |  |  |  |  |  | $ 6,797 | 16,260 | 907 |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  |  |  |  | (2,748) | (3,168) | (105) |  |  |  |  |
Real Estate Investment Property, at Cost, Including Note Payable Assumed |  |  |  |  |  |  |  | 297,000 |  |  |  |  | 297,000 |  |  |  |  |  |
Real Estate Investment Property, at Cost, Net of Adjustments |  |  |  |  |  |  |  | $ 195,740 |  |  |  |  | 195,740 | 48,200 | $ 167,000 |  |  |  |
Property Acquired [Member] | Wellington [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract Purchase Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 167,000 |  |
Payments to Acquire Real Estate |  |  |  |  |  |  |  |  |  |  |  | 166,700 |  |  |  |  |  |  |
Other Payments to Acquire Businesses |  |  |  |  |  |  |  |  |  |  |  | $ 300 |  |  |  |  |  |  |
Property Acquired [Member] | Yale West [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract Purchase Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 73,000 |
Other Payments to Acquire Businesses |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,600 |  |  |  |  |
Property Acquired [Member] | The Army Navy Club Building [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable Square Feet | ft² |  |  | 108,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract Purchase Price |  |  | $ 79,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property Acquired [Member] | 1775 Eye Street [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable Square Feet | ft² |  | 185,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract Purchase Price |  | $ 104,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Payments to Acquire Businesses |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,900 |  |  |  |  |  |
Property Acquired [Member] | Spring Vally Retail Center [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable Square Feet | ft² | 75,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract Purchase Price | $ 40,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property Acquired [Member] | The Paramount [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract Purchase Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 48,200

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