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Joint Ventures (Details Textual) (USD $)
 3 Months Ended 12 Months Ended 1 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Jan. 31, 2012
Unconsolidated Joint Venture Eight San Francisco California [Member]
Dec. 31, 2012
399 Fremont [Member]
Dec. 31, 2012
1st payment [Member]
399 Fremont [Member]
Jan. 31, 2013
Subsequent Event [Member]
2nd payment [Member]
399 Fremont [Member]
Joint Ventures              
Total ownership of our consolidated joint ventures less than 100%            
Payments for interest in joint venture           $ 13,500,000 $ 4,700,000
Ownership interest in joint venture         7.50%    
Initial investment in equity method investment       37,300,000      
Unamortized discount 15,600,000 16,900,000          
First installment of payable incurred in partial consideration for acquisition of ownership interest in joint venture 168,119,000            
Second installment of payable incurred in partial consideration for acquisition of ownership interest in joint venture 357,946,000            
Interest expense incurred during period 30,981,000 34,745,000          
Company's equity investment in joint venture 490,776,000   507,037,000   55,500,000    
Non-controlling interest held in joint venture       92.50%      
Deferred profit from the sale of properties (29,379,000) (29,406,000)          
Management fees for our involvement in the joint ventures $ 2,700,000 $ 3,000,000