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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of weighted average assumption for stock option The weighted average assumptions used in the Black-Scholes model for valuing stock option grants were as follows.
Nine Months Ended September 30,
20202019
Dividend yield— %— %
Expected volatility25 %25 %
Risk-free interest rate1.72 %2.37 %
Expected average life7 years7 years
Weighted average per share fair value of options$23.74 $19.23 
Schedule of stock options outstanding
A summary of the Company’s stock option activity is summarized below.
Stock OptionsOption Shares
Outstanding		Weighted
Average
Exercise Price		Weighted Average
Remaining
Life (Years)		Aggregate
Intrinsic Value
(in thousands)
Outstanding - December 31, 20191,443,733 $48.75 
Granted44,500 70.09 
Exercise of stock options *(47,237)(23.26)
Forfeited— — 
Outstanding - September 30, 20201,440,996 $50.24 6.8$10,300 
Exercisable - September 30, 2020747,746 $44.44 6.2$7,727 
* The terms of the stock option agreements permit having a number of shares of stock withheld, the fair market value of which as of the date of exercise is sufficient to satisfy the exercise price and/or tax withholding requirements. For the nine months ended September 30, 2020, 17,699 such shares were surrendered to the Company.
Schedule of restricted stock awards
A summary of the Company’s restricted stock activity is summarized below.
Restricted StockWeighted Average Grant
Date Fair Value		Restricted Shares
Outstanding
Outstanding - December 31, 2019$44.94 22,521 
Granted55.52 10,450 
Vested *43.87 (13,865)
Forfeited— — 
Outstanding - September 30, 2020$51.50 19,106 
* The terms of the restricted stock agreements permit the surrender of shares to the Company upon vesting in order to satisfy applicable tax withholding requirements at the minimum statutory withholding rate, and accordingly, 1,482 shares were surrendered during the nine months ended September 30, 2020.