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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Stock-Based Compensation [Abstract]  
Stock option activity
The following table summarizes information concerning stock options outstanding:

(In thousands, except share and per share data)
 
Number of
Shares
  
Weighted
Average
Exercise
Price
  
Weighted
Average
Remaining
Contractual
Term
(in Years)
  
Aggregate
Intrinsic
Value
 
Outstanding at January 1, 2017
  
230,174
  
$
24.35
       
Granted
  
1,500
   
40.63
       
Exercised
  
(118,844
)
  
25.94
       
Expired
  
(800
)
  
24.46
       
Outstanding at December 31, 2017
  
112,030
  
$
22.88
   
2.13
  
$
1,566
 
Exercisable at December 31, 2017
  
107,280
  
$
22.41
   
1.84
  
$
1,544
 
Expected to Vest
  
4,750
  
$
33.52
   
8.68
  
$
22
 
 
Cash proceeds, tax benefits and intrinsic value of stock options exercised
Total stock-based compensation expense for stock option awards totaled $0.1 million, $0.2 million and $0.2 million for the years ended December 31, 2017, 2016 and 2015, respectively. Cash proceeds, tax benefits and intrinsic value related to total stock options exercised is as follows: 

 
 
Years ended December 31,
 
(In thousands)
 
2017
  
2016
  
2015
 
Proceeds from stock options exercised
 
$
3,083
  
$
8,398
  
$
12,044
 
Tax benefits related to stock options exercised
  
650
   
1,223
   
952
 
Intrinsic value of stock options exercised
  
1,699
   
3,143
   
2,446
 
Fair value of shares vested during the year
  
329
   
105
   
63
 
Unvested restricted stock units activity
The Company has outstanding restricted stock granted from various plans at December 31, 2017. The Company recognized $3.5 million, $4.2 million and $3.9 million in stock-based compensation expense related to these stock awards for the years ended December 31, 2017, 2016 and 2015, respectively. Tax benefits recognized with respect to restricted stock awards and stock units were $2.5 million, $2.9 million and $1.5 million for the years ended December 31, 2017, 2016 and 2015, respectively. Unrecognized compensation cost related to restricted stock awards and stock units totaled $4.8 million at December 31, 2017 and will be recognized over 2.1 years on a weighted average basis. Shares issued are funded from the Company’s treasury stock. The following table summarizes information for unvested restricted stock units outstanding as of December 31, 2017:

 
 
Number
of
Shares
  
Weighted-
Average
Grant Date Fair
Value
 
Unvested at January 1, 2017
  
613,163
  
$
22.62
 
Forfeited
  
(5,545
)
  
23.18
 
Vested
  
(198,652
)
  
22.34
 
Granted
  
125,772
   
36.15
 
Unvested at December 31, 2017
  
534,738
  
$
25.77