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Subsequent Events (Details) (Texas Acquisition [Member], USD $)
1 Months Ended
Jul. 19, 2013
contract
Jul. 29, 2013
Subsequent Event [Member]
Jul. 29, 2013
Term Loan [Member]
Subsequent Event [Member]
Jul. 19, 2013
Houston, Texas [Member]
sqft
Jul. 19, 2013
Fort Worth, Texas [Member]
sqft
Subsequent Event [Line Items]          
Number of purchase and sale contracts (contract) 2        
Area of real estate property (square foot)       4,400,000 980,000
Business acquisition purchase price       $ 1,100,000,000  
Debt face amount     950,000,000    
Debt, potential increased debt limit   150,000,000      
Debt, amount extendable under first extension   500,000,000      
Debt extension period (years)   1 year      
Debt, amount extendable under second extension   $ 375,000,000