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Real Estate Investments - Purchase Price Allocation (Details) - USD ($) $ in Thousands | Dec. 19, 2018 | Dec. 11, 2018 | Jan. 05, 2018 | Oct. 13, 2017 | Jul. 28, 2017 | Nov. 01, 2018
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Quarry Lake II [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquisition Date |  | Dec. 19, 2018 |  |  |  |  |
Building, land and improvements |  | $ 35,120 |  |  |  |  |
Intangible assets acquired |  | 5,809 |  |  |  |  |
Below market lease liabilities assumed |  | (1,524) |  |  |  |  |
Deferred gain |  | 0 |  |  |  |  |
Total unencumbered acquisition value |  | 39,405 |  |  |  |  |
Mortgage debt assumed - at fair value |  | 0 |  |  |  |  |
Total encumbered acquisition value |  | 39,405 |  |  |  |  |
Total unencumbered acquisition value |  | 39,405 |  |  |  |  |
Mortgage debt repaid at settlement (c) |  | 0 |  |  |  |  |
Investment in unconsolidated real estate ventures |  | 0 |  |  |  |  |
Gain on promoted interest in unconsolidated real estate venture |  | 0 |  |  |  |  |
Gain on real estate venture transactions |  | 0 |  |  |  |  |
Purchase price reduction for note receivable |  | 0 |  |  |  |  |
Net working capital assumed |  | (368) |  |  |  |  |
Total cash payment at settlement |  | $ 39,037 |  |  |  |  |
Quarry Lake II [Member] | Below Market Lease [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average amortization period |  | 3 years |  |  |  |  |
DRA Austin Venture [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquisition Date |  |  | Dec. 11, 2018 |  |  |  |
Building, land and improvements |  |  | $ 457,390 |  |  |  |
Intangible assets acquired |  |  | 76,925 |  |  |  |
Below market lease liabilities assumed |  |  | (13,769) |  |  |  |
Deferred gain |  |  | 14,594 |  |  |  |
Total unencumbered acquisition value |  |  | 535,140 |  |  |  |
Mortgage debt assumed - at fair value |  |  | 0 |  |  |  | $ (115,500)
Total encumbered acquisition value |  |  | 535,140 |  |  |  |
Total unencumbered acquisition value |  |  | 535,140 |  |  |  |
Mortgage debt repaid at settlement (c) |  |  | (115,461) |  |  |  |
Investment in unconsolidated real estate ventures |  |  | (14,594) |  |  |  |
Gain on promoted interest in unconsolidated real estate venture |  |  | (28,283) |  |  |  |
Gain on real estate venture transactions |  |  | (103,847) |  |  |  |
Purchase price reduction for note receivable |  |  | (130,742) |  |  |  |
Net working capital assumed |  |  | (24,865) |  |  |  |
Total cash payment at settlement |  |  | $ 117,348 |  |  |  |
DRA Austin Venture [Member] | Intangible Assets Acquired [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average amortization period |  |  | 5 years 6 months |  |  |  |
DRA Austin Venture [Member] | Below Market Lease [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average amortization period |  |  | 4 years 7 months 6 days |  |  |  |
Four Tower Bridge [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquisition Date |  |  |  | Jan. 05, 2018 |  |  |
Building, land and improvements |  |  |  | $ 20,734 |  |  |
Intangible assets acquired |  |  |  | 3,144 |  |  |
Below market lease liabilities assumed |  |  |  | (182) |  |  |
Deferred gain |  |  |  | 0 |  |  |
Total unencumbered acquisition value |  |  |  | 23,696 |  |  |
Mortgage debt assumed - at fair value |  |  |  | (9,940) |  |  |
Total encumbered acquisition value |  |  |  | 13,756 |  |  |
Total unencumbered acquisition value |  |  |  | 23,696 |  |  |
Mortgage debt repaid at settlement (c) |  |  |  | 0 |  |  |
Investment in unconsolidated real estate ventures |  |  |  | (3,502) |  |  |
Gain on promoted interest in unconsolidated real estate venture |  |  |  | 0 |  |  |
Gain on real estate venture transactions |  |  |  | (11,633) |  |  |
Purchase price reduction for note receivable |  |  |  | 0 |  |  |
Net working capital assumed |  |  |  | 1,379 |  |  |
Total cash payment at settlement |  |  |  | $ 0 |  |  |
Four Tower Bridge [Member] | Intangible Assets Acquired [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average amortization period |  |  |  | 4 years 1 month 6 days |  |  |
Four Tower Bridge [Member] | Below Market Lease [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average amortization period |  |  |  | 4 years 9 months 18 days |  |  |
Bulletin Building [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Building, land and improvements |  |  |  |  | $ 30,583 |  |
Intangible assets acquired | [1] |  |  |  | 10,575 |  |
Below market lease liabilities assumed | [2] |  |  |  | (4,055) |  |
Total encumbered acquisition value |  |  |  |  | 37,775 |  |
Construction-in-progress |  |  |  |  | $ 672 |  |
Bulletin Building [Member] | Intangible Assets Acquired [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average amortization period |  |  |  |  | 7 years 10 months 24 days |  |
Bulletin Building [Member] | Below Market Lease [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average amortization period |  |  |  |  | 7 years |  |
3000 Market Street [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Building, land and improvements |  |  |  |  |  | $ 32,004 |
Intangible assets acquired | [3] |  |  |  |  | 2,562 |
Below market lease liabilities assumed | [4] |  |  |  |  | (1,818) |
Total encumbered acquisition value |  |  |  |  |  | $ 32,748 |
3000 Market Street [Member] | Intangible Assets Acquired [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average amortization period |  |  |  |  |  | 5 years 10 months 24 days |
3000 Market Street [Member] | Below Market Lease [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average amortization period |  |  |  |  |  | 6 years |
[1] | Weighted average amortization period of 7.9 years.
[2] | Weighted average amortization period of 7.0 years.
[3] | Weighted average amortization period of 5.9 years.
[4] | Weighted average amortization period of 6.0 years.

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