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Equity Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Compensation Expense Information Based on Fair Value of Stock Options and RSUs
The following table provides compensation expense information based on the fair value of stock options and RSU's for the years ended December 31 as follows:
(In thousands)201920182017
Equity-based Compensation Expense$3,843  $3,098  $2,598  
Tax Benefit(452) (179) (140) 
Equity-based Compensation Expense, Net of Tax$3,391  $2,919  $2,458  
Summary of Weighted Average Fair Value of Options Granted
201920182017
Weighted Average Fair Value of the Options Granted$11.93  $14.64  $15.30  
Summary of Weighted-Average Assumptions
The weighted average fair value for these options was estimated at the date of grant using a Black-Scholes option pricing model with the following weighted-average assumptions:
201920182017
Risk-free Interest Rate1.67% – 1.78%2.63% – 2.87%2.05% – 2.36%
Dividend Yield—%  —%  —%  
Volatility Factor0.390.390.40 – 0.41
Expected Life in Years5.0 – 7.05.0 – 8.05.0 – 8.0
Summary of Company's Stock Option Activity and Related Information
A summary of the Company’s stock option activity and related information for the years ended December 31 is as follows:
201920182017
(Aggregate intrinsic value in
thousands)		Options
Weighted
Average
Exercise
Price
Aggregate
Intrinsic
Value
OptionsWeighted
Average
Exercise
Price		Aggregate
Intrinsic
Value		OptionsWeighted
Average
Exercise
Price		Aggregate
Intrinsic
Value
Outstanding at January 11,327,919  $18.13  $13,042  1,506,604  $14.65  $23,801  1,539,017  $12.91  $35,630  
Options Granted138,300  $30.04  $(289) 120,270  $32.33  $(226) 118,612  $33.40  $315  
Options Exercised(313,326) $5.38  $(7,072) (274,941) $3.89  $(7,303) (131,904) $9.77  $(3,467) 
Options Forfeited(36,848) $21.56  $(235) (24,014) $34.13  $88  (19,121) $24.27  $(225) 
Outstanding at December 311,116,045  $23.07  $5,446  1,327,919  $18.13  $16,360  1,506,604  $14.65  $32,253  
Exercisable at December 31802,873  $19.79  $6,551  1,043,596  $14.27  $16,885  1,252,315  $11.17  $31,177  
Summary of Weighted Average Exercise Prices and Contractual Lives for Outstanding and Exercisable Stock Options
The following is a summary of weighted average exercise prices and contractual lives for outstanding and exercisable stock options as of December 31, 2019:
 OutstandingExercisable
Exercise Price RangeShares
Weighted Average
Remaining Life
in Years
Weighted 
Average
Exercise Price
Shares
Weighted Average
Remaining Life
in Years
Weighted
Average
Exercise Price
$ 3.19 – $ 13.63419,944  1.9$9.58  419,944  1.9$9.58  
$ 22.69 – $ 35.82677,848  7.3$30.82  364,676  6.0$30.25  
$ 45.89 – $ 45.8918,253  5.2$45.89  18,253  5.2$45.89  
1,116,045  5.2$23.07  802,873  3.8$19.79  
Fair Value for Options Granted under Employee Stock Purchase Plan
The fair value for the options granted under the Employee Stock Purchase Plan was estimated at the date of grant using a Black-Scholes option pricing model with the following weighted-average assumptions:
201920182017
Risk-free Interest Rate1.73 %2.60 %1.31 %
Dividend Yield— %— %— %
Volatility Factor0.53  0.33  0.26  
Expected Life in Years1.01.01.0