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Earnings Per Share and Capital Structure Stock-based Awards (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stock-based awards excluded from diluted EPS calculation (antidilutive) 1,300,000 881,000 1,100,000 1,200,000