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Borrowing Arrangements (Mortgages) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
property
loan
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Debt Instrument [Line Items]      
Gain (loss) on extinguishment of debt $ (14,411) $ (5,564) $ (1,201)
Debt assumed in connection with acquisition $ 177,857 241,076 183,848
Mortgage loans      
Debt Instrument [Line Items]      
Number of mortgage loans outstanding | loan 133    
Secured loan receivable, carrying amount and amortized cost $ 2,000,000    
Number of properties which are held as collateral for the mortgage loans | property 157    
Number of mortgage loans bearing interest at fixed rates | loan 116    
Principal amount outstanding of fixed rate mortgage loans $ 1,600,000    
Number of mortgage loans bearing interest at lender's variable rates | loan 17    
Principal amount outstanding of variable rate mortgage loans $ 433,300    
Weighted average annual rate on fixed rate mortgage loans (as a percent) 5.70%    
Weighted average annual rate on variable rate mortgage loans (as a percent) 2.00%    
Weighted average maturity period of mortgage loans (in years) 5 years 6 months    
Mortgage loans repaid in full   398,000 493,700
Gain (loss) on extinguishment of debt   (2,300) 500
Debt assumed in connection with acquisition   $ 246,800 $ 178,800
Mortgage loans | Minimum      
Debt Instrument [Line Items]      
Fixed interest rate (as a percent) 3.60%    
Interest rate on mortgage loans bearing interest at lender's variable rates (as a percent) 0.90%    
Mortgage loans | Maximum      
Debt Instrument [Line Items]      
Fixed interest rate (as a percent) 8.60%    
Interest rate on mortgage loans bearing interest at lender's variable rates (as a percent) 3.20%    
Mortgages Repaid      
Debt Instrument [Line Items]      
Weighted average maturity period of mortgage loans (in years) 2 years 1 month 6 days    
Mortgage loans repaid in full $ 461,900    
Gain (loss) on extinguishment of debt $ (9,900)