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Fair Value Measurements (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Fair Value [Line Items]          
Notional amount $ 2,500,000,000   $ 2,500,000,000    
Fair value of interest rate swaps         76,900,000
Interest Rate Swap Maturity Date September 30, 2013   September 30, 2013   September 30, 2013
marketable securities 31,000 0 130,929,000 0  
Proceeds from sale of investment securities     135,571,000 0  
Level 2 [Member]
         
Fair Value [Line Items]          
Fair Value Level         $ 76,900,000