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Stockholders' Equity (Narrative) (Details) (USD $)	1 Months Ended		12 Months Ended			1 Months Ended
Stockholders' Equity (Narrative) (Details) (USD $)	Jun. 30, 2012	Jan. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2012 Parent	May 31, 2012 Parent
Class of Stock [Line Items]
Shares withheld for the payment of taxes			560,484	747,225	88,950
Stock repurchase authorization	$ 350,000,000	$ 350,000,000
Stock repurchase program, share			6,775,729
Stock repurchase program, value			205,600,000
Structured stock repurchase agreement			8,620,000			8,600,000	100,000,000
Value of shares withheld related to tax withholding for share-based compensation			$ 22,400,000	$ 24,900,000	$ 1,200,000

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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