XML 105 R92.htm IDEA: XBRL DOCUMENT v3.6.0.2
Share and Unit-Based Plans - Stock Option Activity (Details) - Stock options - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Options      
Balance at beginning of year (shares) 10,314 10,068 10,068
Granted (shares) 0 0 0
Exercised (in shares) 0 0 0
Special dividend adjustment (shares) 251 246 0
Balance at end of year (shares) 10,565 10,314 10,068
Weighted Average Exercise Price (in dollars per share)      
Balance at beginning of year (in dollars per share) $ 58.15 $ 59.57 $ 59.57
Granted (in dollars per share) 0.00 0.00 0.00
Exercised (in dollars per share) 0.00 0.00 0.00
Special dividend adjustment (in dollars per share) 56.77 58.15 0.00
Balance at end of year (in dollars per share) $ 56.77 $ 58.15 $ 59.57