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Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2013
Dec. 31, 2012
Accumulated other comprehensive income $ 7,442   $ 7,442   $ 7,452 $ 6,412
OCI before reclassifications 443 (1,332) 163 (1,610)    
OCI before reclassifications (1,015) 61 (252) 1,579    
OCI before reclassifications 552   2,149      
Amounts reclassified from AOCI 562 567 1,119 1,129    
Net current period OCI (10) (864) 1,030 938    
Reclassification on cash flow hedges - interest rate contracts Interest Expense          
Total Shareholder Equity [Member]
           
Accumulated other comprehensive income (2,974)   (2,974)   (2,527) (2,756)
Accumulated other comprehensive income 10,829   10,829   10,377 9,742
OCI before reclassifications 115   901      
OCI before reclassifications 452   1,087      
Amounts reclassified from AOCI 562   1,119      
Net current period OCI (447)   (218)      
Net current period OCI 452   1,087      
Noncontrolling Interest [Member]
           
Accumulated other comprehensive income (3,596)   (3,596)   (3,519) (3,563)
Accumulated other comprehensive income 2,447   2,447   2,385 2,263
OCI before reclassifications (77)   (33)      
OCI before reclassifications 62   184      
Amounts reclassified from AOCI 0          
Net current period OCI (77)   (33)      
Net current period OCI 62   184      
Redeemable Noncontrolling Partnership Interests [Member]
           
Accumulated other comprehensive income 372   372   376 373
Accumulated other comprehensive income 364   364   360 353
OCI before reclassifications (4)   (1)      
OCI before reclassifications 4   11      
Amounts reclassified from AOCI 0          
Net current period OCI (4)   (1)      
Net current period OCI $ 4   $ 11