Annual report pursuant to Section 13 and 15(d)

Earnings per Share (Narrative) (Details)

v2.4.0.6
Earnings per Share (Narrative) (Details)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock Options And Service Based Restricted Stock Units [Member]
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation of earnings per share, number of shares 887,186 452,907 480,707
Performance Based Restricted Stock Units [Member]
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation of earnings per share, number of shares 36,506 34,448 43,323