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, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Interest Rate Swap [Member] | Swap Derivative 1 Point 02 Percent Maturing January 2, 2016 [Member]
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