XML 89 R68.htm IDEA: XBRL DOCUMENT v3.8.0.1
Earnings Per Share - (Narrative) (Details) - shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]      
Antidilutive securities excluded from computation of earnings per share, number of shares 3,009 2,467 3,074