Annual report pursuant to Section 13 and 15(d)

Earnings per Share (Narrative) (Details)

v3.3.1.900
Earnings per Share (Narrative) (Details) - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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 154,170 409,250 721,590
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 122,858 120,363 21,858