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Income Per Share (Narrative) (Details)	3 Months Ended
Income Per Share (Narrative) (Details)	Mar. 31, 2011	Mar. 31, 2012
Income Per Share [Abstract]
Interest rate at March 31, 2012		4.125%
Shares of common stock contingently issuable	723,961

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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