XML 93 R83.htm IDEA: XBRL DOCUMENT v3.19.1
Stock-Based Compensation (Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity) (Details) - Restricted Stock [Member]
3 Months Ended 12 Months Ended
Mar. 31, 2019
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning period, nonvested number of shares | shares 25,473 32,809
Number of shares, granted | shares 3,584 10,662
Number of shares, vested | shares (13,322) (17,607)
Number of shares, cancelled | shares   (391)
Ending period, nonvested number of shares | shares 15,735 25,473
Beginning period, weighted average grant date fair value, nonvested number of shares | $ / shares $ 28.76 $ 22.61
Weighted average grant date fair value, granted | $ / shares 30.00 36.43
Weighted average grant date fair value, vested | $ / shares 24.51 $ 21.85
Weighted average grant date fair value, cancelled | $ / shares   27.69
Ending period, weighted average grant date fair value, nonvested number of shares | $ / shares $ 24.55 $ 28.76