Annual report pursuant to Section 13 and 15(d)

Earnings per Share Earnings per Share (Narrative) (Details)

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Earnings per Share Earnings per Share (Narrative) (Details)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
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 360,795 887,186 452,907
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 10,929 36,506 34,448