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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Company's stock-based compensation activity The following table summarizes the Company’s stock option activity for the year ended December 31, 2018:
 
Shares
(in thousands)
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Life
 
Aggregate
Intrinsic
Value*
(in thousands)
Non-Qualified Stock Options
 
 
 
Outstanding at January 1, 2018
28

 
$
29.66

 
0.1

 
$
780

Exercised
(23
)
 
$
29.66

 
 

 
 

Forfeited
(5
)
 
$
29.66

 
 
 
 
Outstanding and exercisable at December 31, 2018
—

 
$
—

 
—

 
$
—

The following table shows the Company’s stock-based compensation activity:
 
Fiscal Years Ended December 31,
(in thousands) 
2018
 
2017
 
2016
Stock-based compensation expense recognized in operating expenses
$
10,356

 
$
12,744

 
$
13,113

Tax benefit of stock-based compensation expense in provision for income taxes
2,476

 
4,575

 
4,757

Stock-based compensation expense, net of tax
$
7,880

 
$
8,169

 
$
8,356

Fair value of shares vested
$
15,372

 
$
11,043

 
$
13,186

Proceeds to the Company from the exercise of stock-based compensation
$
695

 
$
6,610

 
$
7,976

Tax benefit from exercise of stock-based compensation, including shortfall tax benefits
$
—

 
$
—

 
$
(251
)
Schedule of unvested restricted stock unit activity following table summarizes the Company’s unvested restricted stock unit activity for the year ended December 31, 2018:

Shares
(in thousands)
 
Weighted-
Average
Price
 
Aggregate
Intrinsic
Value *
(in thousands)
Unvested Restricted Stock Units (RSUs)
 
 
Outstanding at January 1, 2018
696

 
$
35.34

 
$
39,609

Awarded
189

 
54.99

 


Vested
(263
)
 
35.23

 


Forfeited
(18
)
 
39.23

 


Outstanding at December 31, 2018
604

 
$
41.37

 
$
32,669

Outstanding and expected to vest at December 31, 2018
598

 
$
41.32

 
$
32,388



*  The intrinsic value for outstanding and expected to vest is calculated using the closing price per share of $54.13, as reported by the New York Stock Exchange on December 31, 2018.