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Unsecured Line of Credit (Details) (USD $)
 12 Months Ended 0 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
Y
Dec. 31, 2012
Jul. 26, 2013
After the Amendment [Member]
Jul. 26, 2013
Prior to Amendment [Member]
Jul. 26, 2013
Alternative Base Interest Rate Calculation [Member]
M
Jul. 26, 2013
Maximum [Member]
Jul. 26, 2013
Maximum [Member]
After the Amendment [Member]
Jul. 26, 2013
Maximum [Member]
Interest Rate Based on LIBOR or CDOR [Member]
Jul. 26, 2013
Maximum [Member]
Alternative Base Interest Rate Calculation [Member]
Jul. 26, 2013
Minimum [Member]
Jul. 26, 2013
Minimum [Member]
Interest Rate Based on LIBOR or CDOR [Member]
Jul. 26, 2013
Minimum [Member]
Alternative Base Interest Rate Calculation [Member]
Dec. 31, 2013
Rate Based on Current Credit Rating [Member]
Interest Rate Based on LIBOR or CDOR [Member]
Dec. 31, 2013
Rate Based on Current Credit Rating [Member]
Alternative Base Interest Rate Calculation [Member]
Dec. 31, 2013
Rate Based on Current Credit Rating [Member]
Current Rates Based on Credit Ratings [Member]
Line of Credit Facility [Line Items]                              
Line of Credit Facility, Current Borrowing Capacity     $ 1,000,000,000 $ 750,000,000                      
Line of Credit Facility, Maximum Borrowing Capacity             1,500,000,000                
Line of Credit Facility, Expiration Date     Jul. 26, 2018 Jun. 24, 2014                      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage           0.35%       0.125%         0.15%
Margin added to Calculated Interest Rate               1.70% 0.70%   0.925% 0.00% 1.00% 0.00%  
Amount added to Federal Funds Rate to Calculate Interest Rate         0.50%                    
LIBOR Period Used to Calculate Interest Rate (in months)         1                    
Amount added to LIBOR to Calculate Interest Rate         1.00%                    
Line of Credit Facility, Amount Outstanding $ 0.0 $ 0                          
Leverage Ratio, Maximum 60.00%                            
Leverage Ratio Maximum Increasing Limit 65.00%                            
Leverage Ratio Reduction Limit 60.00%                            
Leverage Ratio Reduction Period, Years 1                            
Maximum Secured Debt Leverage Ratio 55.00%                            
Fixed Charge Coverage Ratio Minimum. 1.40                            
Maximum Unsecured Debt Leverage Ratio 60.00%                            
Unsecured Debt Leverage Ratio Maximum Increasing Limit 65.00%                            
Unsecured Debt Leverage Ratio Reduction Limit 60.00%                            
Unsecured Debt Leverage Ratio Reduction Period, Years 1                            
Unsecured Debt Interest Coverage Ratio Minimum. 1.75