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Earnings Per Share (Details)	3 Months Ended		9 Months Ended
Earnings Per Share (Details)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Potentially dilutive securities:
Stock options and awards (in shares)	984,388	784,079	856,112	715,512
Options to purchase common stock excluded from potentially dilutive securities (in shares)	0	3,228	0	281,528

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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