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Stock Repurchase Program Stock Repurchase Program (Tables)
12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Class of Treasury Stock Repurchases for 2015 through 2017 for all programs were as follows:
Year Ended
 
Number of Shares
 
Repurchased Amount
 
Average Price per Share
December 31, 2015
 
711,708
 
$11,567,527
 
$16.25
December 31, 2016
 
319,805
 
5,390,355
 
16.86
December 31, 2017
 
788,416
 
11,054,983
 
14.02
Totals to Date
 
1,819,929
 
$28,012,865
 
$15.39