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Income Per Share (Narrative) (Details)	12 Months Ended			12 Months Ended
Income Per Share (Narrative) (Details)	Dec. 31, 2012	Jan. 18, 2013	Dec. 31, 2010	Dec. 31, 2011 Exchangeable Senior Debentures [Member]
Interest rate		4.25%		4.125%
Maturity date				Aug. 15, 2026
Shares of common stock contingently issuable	370,719
Strike price			31.42

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met.

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