XML 120 R98.htm IDEA: XBRL DOCUMENT v3.6.0.2
Stock-Based Compensation Performance Shares Granted During the Period (Details) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average fair vale (USD per share) $ 105.48 $ 97.48 $ 106.44
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares outstanding (shares) 29,012 31,553 24,008
Minimum | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance based criteria plan payout percentage 0.00% 0.00% 0.00%
Maximum | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance based criteria plan payout percentage 250.00% 250.00% 250.00%