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Share-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock-Based Compensation Expense
A summary of stock-based compensation expense and related tax benefits for the years ended December 31, 2018, 2017 and 2016 is as follows:
Year Ended December 31, 
201820172016
(in thousands) 
Stock options$2,989 $3,740 $3,193 
Restricted stock units and restricted stock 2,591 1,205 550 
Employee Stock Purchase Plan 320 1,040 509 
Total pre-tax stock-based compensation expense charged against income 1
$5,900 $5,985 $4,252 
Total recognized tax benefit related to stock-based compensation $1,480 $5,709 $2,773 

1Stock-based compensation expense is recorded in the selling, general and administrative caption in the Consolidated Statements of Comprehensive Income.
Summary of Stock Options Activity
A summary of stock options outstanding under the Plan as of December 31, 2018 and changes during 2018 is as follows:
 
Number of Shares
Weighted Average Exercise Price
(in thousands) 
December 31, 20172,374 $29.22 
Granted169 $52.06 
Exercised(351)$25.12 
Forfeited(65)$35.50 
Expired(6)$27.10 
December 31, 20182,121 $31.53 
Assumption for Fair Value of Options Granted
The fair value of the stock option awards granted during 2018, 2017 and 2016 were estimated on the dates of grant using the Black-Scholes option valuation model and the following assumptions:
Year Ended December 31, 
2018 2017 2016 
Risk-free interest rate2.1 %2.0 %2.0 %
Weighted average expected life5.8 years5.8 years5.8 years
Expected volatility21.5 %25.1 %26.0 %
Dividend yield1.5 %1.9 %2.0 %
Summarized Information of Stock Options Outstanding
The following table summarizes other information about the stock options at December 31, 2018:
December 31, 2018
(amounts in thousands, except per share data)
Outstanding:
Aggregate intrinsic value$20,351 
Weighted average remaining contractual life5.9 years
Exercisable:
Number of options1,051 
Weighted average exercise price$25.20 
Aggregate intrinsic value$15,750 
Weighted average remaining contractual life4.5 years
Summary of Stock Options Outstanding
A summary of the outstanding restricted stock units and restricted stock as of December 31, 2018 and changes during 2018 is as follows:
Restricted Stock Units and Restricted Stock
Number Weighted Average Grant Date Fair Value 
(in thousands) 
December 31, 2017145 $37.07 
Granted139 $52.06 
Vested(36)$35.79 
Forfeited(7)$52.06 
December 31, 2018241 $45.47 
Weighted Average Grant-Date Fair Values and Intrinsic Values of Options Vested
The weighted average grant-date fair values and total fair values of restricted stock units and restricted stock vested during 2018, 2017 and 2016 are as follows:
Year Ended December 31, 
201820172016
(in thousands, except per share data)
Weighted average grant-date fair value of restricted stock units and restricted stock granted$52.06 $40.16 $34.14 
Total fair value of restricted stock units and restricted stock vested$1,822 $690 $311 
Summary of ESPP Annual Offerings
The following table summarizes information about the Company’s ESPP annual offerings for the years ended December 31, 2018, 2017 and 2016:
Year Ended December 31,
 201820172016
(in thousands, except per share data)
Common shares purchased53 54 53 
Per common share purchase price$34.15 $33.29 $29.64 
Summary of Information Of SERP
The following table summarizes information about the SERP for the plan years ended December 31, 2018, 2017 and 2016:
Year Ended December 31,
 201820172016
(in thousands) 
SERP expense 1
$547 $503 $511 
Treasury shares issued to fund SERP expense 2
14 13 
SERP trust account balance at December 31 3
$39,766 $42,467 $34,599 
Unrealized gain (loss) recorded in SERP liability account$(1,469)$4,534 $1,495 
1Both the SERP match and the deferrals are included in the selling, general and administrative caption in the Consolidated Statements of Comprehensive Income.
2Shares related to the SERP match for each year are funded at the beginning of the subsequent year.
3SERP trust account investments are recorded at their fair value which is based on quoted market prices. Differences between such amounts in the table above and the deferred compensation funding asset reported on the Consolidated Balance Sheets represent the value of Company Common Stock held in the Plan participants’ trust accounts and reported by the Company as treasury stock in the Consolidated Balance Sheets.