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Credit Facilities (Details) (USD $)
6 Months Ended 3 Months Ended
Jun. 30, 2013
Aug. 06, 2013
Feb. 14, 2013
Dec. 31, 2012
Feb. 14, 2013
Unsecured Debt [Member]
Aug. 06, 2013
Term Loan [Member]
Jun. 30, 2013
Term Loan [Member]
Aug. 06, 2013
Revolving Credit Facility [Member]
Jun. 30, 2013
Revolving Credit Facility [Member]
Mar. 18, 2013
Additional Funding Agreement Terms [Member]
Unsecured Debt [Member]
Jun. 30, 2013
Minimum [Member]
Jun. 30, 2013
Maximum [Member]
Jun. 30, 2013
External Credit Rating, Non Investment Grade [Member]
Minimum [Member]
Jun. 30, 2013
External Credit Rating, Non Investment Grade [Member]
Maximum [Member]
Jun. 30, 2013
Term Loan [Member]
External Credit Rating, Investment Grade [Member]
Minimum [Member]
Jun. 30, 2013
Term Loan [Member]
External Credit Rating, Investment Grade [Member]
Maximum [Member]
Jun. 30, 2013
Revolving Credit Facility [Member]
External Credit Rating, Investment Grade [Member]
Minimum [Member]
Jun. 30, 2013
Revolving Credit Facility [Member]
External Credit Rating, Investment Grade [Member]
Maximum [Member]
Jun. 30, 2013
Variable Interest Rate [Member]
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]                                      
Line of Credit Facility, Maximum Borrowing Capacity $ 1,900,000,000 $ 1,700,000,000     $ 1,450,000,000 $ 940,000,000 $ 810,000,000 $ 760,000,000 $ 640,000,000 $ 2,500,000,000                 $ 85,000,000
Debt Instrument, Basis Spread on Variable Rate                         1.60% 2.20% 1.15% 2.00% 0.90% 1.75%  
Line of Credit Facility, Commitment Fee Percentage                     0.15% 0.25%              
Senior corporate credit facility 600,000,000     0                              
Debt Instrument, Interest Rate, Stated Percentage 1.95%                                    
Line of Credit Facility, Amount Bearing Fixed Interest Rate, Amount 515,000,000                                    
Line of Credit, Amount Bearing Fixed Interest Rate, Percentage 2.80%                                    
Senior secured revolving credit facility $ 0     $ 124,604,000                              
Effective interest rate     0.00%