Quarterly report pursuant to Section 13 or 15(d)

Real Estate Joint Ventures (Details)

v3.7.0.1
Real Estate Joint Ventures (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
Property
Dec. 31, 2016
USD ($)
Investments in consolidated real estate joint ventures    
Non-real estate equity method investments $ 2,353 $ 2,355
GI-COPT    
Investments in consolidated real estate joint ventures    
Non-real estate equity method investments 25,400  
Maximum amount at risk 17,800  
Consolidated real estate joint ventures    
Investments in consolidated real estate joint ventures    
Total Assets 264,627  
Encumbered Assets 124,375  
Total Liabilities $ 103,768  
Variable Interest Entity, Primary Beneficiary | LW Redstone Company, LLC    
Investments in consolidated real estate joint ventures    
Ownership (as a percent) 85.00%  
Total Assets $ 157,293  
Encumbered Assets 78,251  
Total Liabilities $ 50,804  
Variable Interest Entity, Primary Beneficiary | M Square Associates, LLC    
Investments in consolidated real estate joint ventures    
Ownership (as a percent) 50.00%  
Total Assets $ 65,158  
Encumbered Assets 46,124  
Total Liabilities $ 45,712  
Variable Interest Entity, Primary Beneficiary | Stevens Investors, LLC    
Investments in consolidated real estate joint ventures    
Ownership (as a percent) 95.00%  
Total Assets $ 42,176  
Encumbered Assets 0  
Total Liabilities 7,252  
Variable Interest Entity, Primary Beneficiary | Stevens Investors, LLC | Other Liabilities    
Investments in consolidated real estate joint ventures    
Due to Affiliate $ 6,700  
Operating office properties    
Investments in consolidated real estate joint ventures    
Number of real estate properties | Property 164  
Single-tenant data centers | Operating office properties    
Investments in consolidated real estate joint ventures    
Number of real estate properties | Property 13  
Single-tenant data centers | Operating office properties | GI-COPT    
Investments in consolidated real estate joint ventures    
Ownership percentage (percent) 50.00%  
Number of real estate properties | Property 6