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Derivative Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Aug. 09, 2013
Jun. 30, 2015
Derivative Financial Instruments [Line Items]    
Document Period End Date   Jun. 30, 2015
2014 Swap [Member]    
Derivative Financial Instruments [Line Items]    
Notional amount   $ 111
Swap agreement collateral   30
Term of swap agreement 1 year  
2013 Swap [Member]    
Derivative Financial Instruments [Line Items]    
Notional amount   152
Swap agreement collateral   $ 40
Term of swap agreement 3 years  
LIBOR [Member] | 2014 Swap [Member]    
Derivative Financial Instruments [Line Items]    
Basis spread on variable rate   1.35%
LIBOR [Member] | 2013 Swap [Member]    
Derivative Financial Instruments [Line Items]    
Basis spread on variable rate   1.20%