Fair Value Measurements (Narrative) (Details) (USD $)			3 Months Ended	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Level 3 [Member]	Jun. 30, 2014 Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized losses related to level 3 financial instruments			$ (500,000)	$ 1,600,000
Fair value of senior notes and other long-term debt, including amounts classified as current	$ 4,500,000,000	$ 4,600,000,000