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Earnings Per Share (Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) (Stock Options [Member])
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Stock Options [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 318 1,184 384 908