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Long-Term Debt (Schedule of Long-term Debt Instruments) (Details) (USD $)
3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Sep. 30, 2011
Jan. 05, 2012
Line of Credit [Member]
Jan. 05, 2012
Accordion Feature [Member]
Sep. 30, 2012
SeniorUnsecuredNotesPayable,5.75%,dueAug15,2022 [Member]
Sep. 30, 2012
SeniorUnsecuredNotesPayable,5.75%,dueAug15,2022 [Member]
Unsecured Debt [Member]
Aug. 08, 2012
SeniorUnsecuredNotesPayable,5.75%,dueAug15,2022 [Member]
Unsecured Debt [Member]
Debt Instrument [Line Items]                
New five year term loan facility       $ 240,000,000        
Length of term loan facility       5 years        
LIBOR plus basis spread, basis spread       1.75%        
Variable rate basis       LIBOR        
All-in interest rate       2.66%        
Term of interest rate swaps       4 years        
New facility, additional borrowing capacity         110,000,000      
Revolving credit facility, amount outstanding 0 0   0        
Line of Credit Facility, Maximum Borrowing Capacity 400,000,000 400,000,000            
Line of Credit Facility, Remaining Borrowing Capacity 400,000,000 400,000,000            
Debt Instrument, Face Amount               350,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate           5.75% 5.75%  
Repayments of Long-term Debt 167,600,000 616,400,000 379,428,000          
Write off of Deferred Debt Issuance Cost 439,000              
Costs associated with loan refinancing or payoff, net (non-cash portion) $ 38,000 $ 439,000 $ 1,759,000          
Debt Covenant, Debt to Adjusted Total Assets Ratio, Maximum             60.00%  
Debt Covenant, Secured Debt to Adjusted Total Assets Ratio, Maximum             40.00%  
Debt Covenant, Debt Service Coverage Ratio, Minimum             1.5  
Debt Covenant, Total Unencumbered Assets to Outstanding Unsecured Debt Ratio, Minimum             150.00%