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Derivative Financial Instruments (Narrative) (Details) (USD $)	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Summary of Derivative Instruments [Abstract]
Cash flow hedge instrument term minimum (in months)	12 months
Cumulative unrealized gain (loss) on cash flow derivative instruments in accumulated other comprehensive loss	$ 3,000,000	$ 0

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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