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Stock Transactions (Narrative) (Details) (USD $)	6 Months Ended	1 Months Ended		6 Months Ended	1 Months Ended	0 Months Ended
	Jun. 30, 2013	Apr. 30, 2013 January 2013 Share Repurchase Authorization [Member]	Jan. 24, 2013 January 2013 Share Repurchase Authorization [Member]	Jun. 30, 2013 January 2013 Share Repurchase Authorization [Member]	Apr. 18, 2013 April 2013 Share Repurchase Authorization [Member]	Jul. 18, 2013 Subsequent Event	Jul. 18, 2013 Subsequent Event July 2013 Share Repurchase Authorization
Equity, Class of Treasury Stock [Line Items]
Treasury Stock, Shares, Acquired		2,865,132		815,011
Treasury Stock, Value, Acquired, Cost Method		$ 182,900,000		$ 47,600,000
Stock Repurchase Program, Authorized Amount			200,000,000.0		100,000,000	400,000,000	100,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 69,500,000

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Amount of a stock repurchase plan authorized by an entity's Board of Directors.

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Amount remaining of a stock repurchase plan authorized by an entity's Board of Directors.

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Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Topic 505

-SubTopic 10

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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-Number 210

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