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
6 Months Ended
Jun. 30, 2017
USD ($)
Property
Dec. 31, 2016
USD ($)
Investments in consolidated real estate joint ventures    
Non-real estate equity method investments $ 2,415 $ 2,355
GI-COPT    
Investments in consolidated real estate joint ventures    
Non-real estate equity method investments 25,300  
Maximum amount at risk 17,400  
Consolidated real estate joint ventures    
Investments in consolidated real estate joint ventures    
Total Assets 287,795  
Encumbered Assets 123,025  
Total Liabilities $ 119,758  
Variable Interest Entity, Primary Beneficiary | LW Redstone Company, LLC    
Investments in consolidated real estate joint ventures    
Ownership (as a percent) 85.00%  
Total Assets $ 157,624  
Encumbered Assets 77,269  
Total Liabilities $ 50,225  
Variable Interest Entity, Primary Beneficiary | M Square Associates, LLC    
Investments in consolidated real estate joint ventures    
Ownership (as a percent) 50.00%  
Total Assets $ 67,789  
Encumbered Assets 45,756  
Total Liabilities $ 46,580  
Variable Interest Entity, Primary Beneficiary | Stevens Investors, LLC    
Investments in consolidated real estate joint ventures    
Ownership (as a percent) 95.00%  
Total Assets $ 62,382  
Encumbered Assets 0  
Total Liabilities 22,953  
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 165  
Single-tenant data centers | Operating office properties    
Investments in consolidated real estate joint ventures    
Number of real estate properties | Property 14  
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