XML 58 R48.htm IDEA: XBRL DOCUMENT v3.19.1
Stock-Based Compensation Plans (Details 2) - Performance Shares
 3 Months Ended
Mar. 31, 2019
$ / shares
shares
Performance awards  
Equity instruments outstanding at the beginning of the period (in shares) 267,129
Equity instruments granted (in shares) 79,840
Change in awards based on performance (in shares) (16,760)
Converted to restricted stock (in shares) (73,072)
Forfeited (in shares) (248)
Equity instruments outstanding at the end of the period (in shares) 256,889
Weighted average grant date fair value per award  
Equity instruments outstanding at the beginning of the period (in dollars per share) | $ / shares $ 157.21
Grant date fair value per share (in dollars per share) | $ / shares 200.69
Change in awards based on performance (in dollars per share) | $ / shares 142.03
Converted to restricted stock (in dollars per share) | $ / shares 142.03
Forfeited (in dollars per share) | $ / shares 167.71
Equity instruments outstanding at the end of the period (in dollars per share) | $ / shares $ 176.03
Grants in period based on total shareholder metrics 47,091
Grants in period based on financial metrics 32,749