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Earnings Per Share Schedule of stock options and restricted units were excluded in the computation of diluted earnings per share because they were anti-dilutive (Details)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Stock Options [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stock options and restricted units excluded from the computation of diluted earnings per share because they were anti-dilutive 4,042 5,048 5,118 4,270
Restricted Stock Units [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stock options and restricted units excluded from the computation of diluted earnings per share because they were anti-dilutive 0 423 0 4