Derivative Financial Instruments (Schedule of Interest Rate Swap Derivatives) (Details) - Interest Rate Swap [Member] - Swap Derivative 1 Point 02 Percent Maturing January 2, 2016 [Member] - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Effective Date	Jan. 02, 2014	Jan. 02, 2014
Expiration Date	Jan. 02, 2016	Jan. 02, 2016
Fixed Rate	0.94%	1.02%
Notional Value	$ 500	$ 500