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Significant Accounting Policies - Investments in Commercial Real Estate Properties (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Investment in Commercial Real Estate Properties      
Depreciable real estate reserves $ 0 $ (56,272,000)  
Rental revenue from amortization of acquired leases 2,400,000 4,800,000  
Reduction in interest expense from amortization of above-market rate mortgages 0 $ 700,000  
Identified intangible assets (included in other assets):      
Gross amount 282,288,000   $ 325,880,000
Accumulated amortization (241,043,000)   (277,038,000)
Net 41,245,000   48,842,000
Identified intangible liabilities (included in deferred revenue):      
Gross amount 359,469,000   540,283,000
Accumulated amortization (256,685,000)   (402,583,000)
Net 102,784,000   137,700,000
Net intangible assets reclassed to assets held for sale 100,000   13,900,000
Net intangible liabilities reclassed to liabilities relates to assets held for sale $ 100,000   $ 4,100,000.0
Minimum | Above-market leases      
Investment in Commercial Real Estate Properties      
Estimated useful life of other intangible assets (in years) 1 year    
Minimum | Below-market leases      
Investment in Commercial Real Estate Properties      
Estimated useful life of other intangible assets (in years) 1 year    
Minimum | In-place leases      
Investment in Commercial Real Estate Properties      
Estimated useful life of other intangible assets (in years) 1 year    
Maximum | Above-market leases      
Investment in Commercial Real Estate Properties      
Estimated useful life of other intangible assets (in years) 14 years    
Maximum | Below-market leases      
Investment in Commercial Real Estate Properties      
Estimated useful life of other intangible assets (in years) 14 years    
Maximum | In-place leases      
Investment in Commercial Real Estate Properties      
Estimated useful life of other intangible assets (in years) 14 years    
Building | Minimum      
Investment in Commercial Real Estate Properties      
Estimated useful life (in years) 3 years    
Building | Maximum      
Investment in Commercial Real Estate Properties      
Estimated useful life (in years) 40 years