XML 20 R91.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
STOCK-BASED COMPENSATION PLANS (Restricted Stock and Restricted Stock Units Activity) (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Weighted Average Grant-Date Fair Value (in dollars per share):      
Document Period End Date Dec. 31, 2019    
Restricted Stock and Restricted Stock Units [Member]      
Unvested Shares: [Roll Forward]      
Unvested, Beginning Balance 318,097 302,077 290,719
Granted 227,262 161,598 153,777
Vested (120,675) (103,363) (103,259)
Forfeited (41,812) (42,215) (39,160)
Unvested, Ending Balance 382,872 318,097 302,077
Weighted Average Grant-Date Fair Value (in dollars per share):      
Unvested, Beginning Balance $ 52.43 $ 48.97 $ 42.26
Granted 53.50 55.04 55.86
Vested 50.23 48.60 43.81
Forfeited 46.25 47.05 39.83
Unvested, Ending Balance $ 54.39 $ 52.43 $ 48.97