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Line Of Credit Payable (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Oct. 31, 2012
Sep. 30, 2010
Line of Credit Facility [Abstract]        
Revolving credit facility original borrowing capacity       $ 450,000,000
Revolving credit facility borrowing capacity     500,000,000  
Revolving credit facility weighted average outstanding balance 41,402,000      
Revolving credit facility weighted average interest rate 1.40%      
Spread over LIBOR 1.075%      
Option to increase facility size 1,000,000,000      
Line of credit payable 46,400,000 174,200,000    
Line of credit facility available for future borrowings $ 453,600,000