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Borrowing Arrangements (Mortgages) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
property
loan
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]      
Debt assumed in connection with acquisition $ 47,641 $ 177,857 $ 241,076
Gain (loss) on extinguishment of debt $ (2,779) $ (14,411) (5,564)
Mortgage loans      
Debt Instrument [Line Items]      
Number of mortgage loans outstanding | loan 113    
Secured loan receivable, carrying amount and amortized cost $ 1,700,000    
Number of properties which are held as collateral for the mortgage loans | property 123    
Number of mortgage loans bearing interest at fixed rates | loan 98    
Principal amount outstanding of fixed rate mortgage loans $ 1,400,000    
Number of mortgage loans bearing interest at lender's variable rates | loan 15    
Principal amount outstanding of variable rate mortgage loans $ 292,100    
Weighted average annual rate on fixed rate mortgage loans 5.60%    
Weighted average annual rate on variable rate mortgage loans 2.10%    
Weighted average maturity period of mortgage loans (in years) 5 years 8 months 2 years 1 month 6 days  
Debt assumed in connection with acquisition     246,800
Mortgage loans repaid in full   $ 461,900 398,000
Gain (loss) on extinguishment of debt   $ (9,900) $ (2,300)
Mortgage loans | Minimum      
Debt Instrument [Line Items]      
Fixed interest rate 3.02%    
Interest rate on mortgage loans bearing interest at lender's variable rates 1.46%    
Mortgage loans | Maximum      
Debt Instrument [Line Items]      
Fixed interest rate 8.63%    
Interest rate on mortgage loans bearing interest at lender's variable rates 3.87%    
Mortgages Paid During Year      
Debt Instrument [Line Items]      
Weighted average maturity period of mortgage loans (in years) 1 year 7 months 28 days    
Mortgage loans repaid in full $ 337,800    
Gain (loss) on extinguishment of debt $ (100)