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Other Assets and Other Liabilities (Deferred Expenses and Other Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Real Estate Properties [Line Items]      
Intangible assets, accumulated amortization $ 31,900 $ 36,800  
Intangible assets, net 30,727 33,532  
Other receivables 52,820 22,557  
Other assets 35,189 36,665  
Restricted cash 25,883 26,657  
Leasing costs, net 11,802 18,668  
Corporate furniture, fixtures and equipment, net 5,691 4,405  
Deferred expenses and other assets, net 162,112 142,484  
Amortization of above market lease and lease incentives 3,900 6,400 $ 8,600
Amortization of intangible assets 1,900 3,600 $ 6,700
Accumulated amortization on leasing costs 6,700 9,800  
Accumulated depreciation on corporate furniture, fixtures and equipment 9,000 8,100  
Operating Properties      
Real Estate Properties [Line Items]      
Other finite-lived intangible assets   32,800  
Other receivables $ 26,000 $ 11,300