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Other Assets and Other Liabilities (Deferred Expenses and Other Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Real Estate Properties [Line Items]      
Other receivables $ 56,369 $ 52,820  
Intangible assets, net 27,124 30,727  
Other assets 24,490 35,189  
Restricted cash 20,045 25,883  
Leasing costs, net 9,050 11,802  
Corporate furniture, fixtures and equipment, net 4,652 5,691  
Deferred expenses and other assets, net 141,730 162,112  
Intangible assets, accumulated amortization 34,900 31,900  
Amortization of above market lease and lease incentives 2,500 3,900 $ 6,400
Amortization of intangible assets $ 1,900 1,900 $ 3,600
Weighted average useful life 19 years 2 months 12 days    
Accumulated amortization on leasing costs $ 4,700 6,700  
Accumulated depreciation on corporate furniture, fixtures and equipment 10,500 9,000  
Operating Properties      
Real Estate Properties [Line Items]      
Other receivables $ 26,000 $ 26,000