XML 95 R77.htm IDEA: XBRL DOCUMENT v3.8.0.1
SHAREHOLDERS' EQUITY AND INCOME PER COMMON SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 21, 2017
Apr. 26, 2016
Jan. 21, 2016
Jan. 21, 2015
Class of Stock [Line Items]              
Stock repurchased (in shares)   1,153,136 967,199        
Stock repurchased   $ 16,854 $ 13,498        
Earnings Per Share Reconciliation [Abstract]              
Net income $ 20,475 $ 22,766 $ 20,017        
Weighted average shares outstanding (in shares) [1] 21,327,000 21,378,000 22,716,000        
Effect of stock options (in shares) 142,000 151,000 119,000        
Stock units for deferred compensation plan for non-employee directors (in shares) 121,000 115,000 112,000        
Performance share units (in shares) 60,000 48,000 0        
Restricted stock units (in shares) 0 35,000 233,000        
Weighted average shares outstanding for calculation of diluted earnings per share (in shares) 21,650,000 21,727,000 23,180,000        
Net income per common share [Abstract]              
Basic (in dollars per share) [1] $ 0.96 $ 1.06 $ 0.88        
Diluted (in dollars per share) $ 0.95 $ 1.05 $ 0.86        
Common Stock [Member]              
Class of Stock [Line Items]              
Stock repurchase program percentage of shares authorized to be repurchased       5.00%   5.00% 5.00%
Stock repurchase program, additional authorized amount         $ 5,000    
Stock repurchased (in shares) 0 1,153,136 967,199        
Stock repurchased $ 0 $ 16,900 $ 13,500        
Stock Options [Member]              
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]              
Antidilutive shares excluded from computation of diluted loss per share (in shares) 0 0 30,000        
[1] Basic net income per common share includes weighted average common shares outstanding during the period and participating share awards.