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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Share Based Compensation and Related Benefits In 2020, 2019 and 2018, we recorded share-based compensation and related benefits as follows:
 Year ended December 31,
(Dollars in thousands)202020192018
Share-based compensation expense$83,986 $66,815 $45,675 
Income tax benefit related to share-based compensation expense
(20,426)(16,152)(10,997)
Capitalized compensation costs1,383 1,517 1,466 
Unrecognized Share Based Compensation Expense
As of December 31, 2020, unrecognized share-based compensation expense was as follows:
(Dollars in thousands)Unrecognized 
Expense		Weighted Average Expected Recognition Period - in Years  
Stock options$13,854 2.42
Restricted stock awards/units119,764 2.59
Total unrecognized share-based compensation expense$133,618 
Weighted Average Assumptions and Fair Values Used for Employee Stock Options and Restricted Stock Units The following weighted average assumptions and fair values were used for our employee stock options and restricted stock units:
Equity Incentive Plan Awards202020192018
Weighted average expected term of options - in years4.64.64.8
Weighted average expected volatility of the Company's underlying common stock
41.9 %35.5 %34.7 %
Risk-free interest rate0.37 2.26 2.82 
Expected dividend yield— — — 
Weighted average grant date fair value - stock options$66.44 $83.50 $105.81 
Weighted average grant date fair value - restricted stock units199.51 243.65 294.50 
Weighted Average Assumptions and Fair Values Used for ESPP
The following weighted average assumptions and fair values were used for our ESPP:
ESPP202020192018
Expected term in years0.50.50.5
Weighted average expected volatility of the Company's underlying common stock51.9 %38.1 %32.2 %
Risk-free interest rate1.12 2.40 1.79 
Expected dividend yield— — — 
Weighted average grant date fair value$69.54 $52.90 $62.76 
Stock Option Information Related to Equity Incentive Plan
The table below provides stock option information related to the 2006 Equity Incentive Plan for the year ended December 31, 2020:
OptionsWeighted
Average
 Exercise Price 		Weighted Average Remaining Contractual Life - in Years  Aggregate Intrinsic Value of 
In-The-Money Options
Outstanding at December 31, 2019625,407 $169.33 
Granted124,091 187.59 
Exercised(173,536)106.42 
Forfeited(15,931)232.60 
Expired(1,030)71.11 
Outstanding at December 31, 2020559,001 191.29 4.01$109,865,324 
Vested and expected to vest at December 31, 2020538,524 190.30 3.94106,375,308 
Exercisable at December 31, 2020276,191 157.07 2.4763,734,604 
Stock Options Outstanding The following table summarizes information regarding stock options outstanding and exercisable as of December 31, 2020:
Outstanding OptionsExercisable Options
Range of Exercise PricesSharesWeighted Average Remaining Contractual Life - in YearsWeighted Average Exercise PriceSharesWeighted Average Exercise Price
$101.14 - 105.84
87,538 2.31$105.15 87,538 $105.15 
105.85 - 126.18
42,249 0.33108.04 42,249 108.04 
126.19 - 173.94
47,407 1.36130.42 46,673 129.81 
173.95 - 181.63
64,974 3.33178.39 45,579 178.39 
181.64 - 195.34
116,375 6.33184.86 — — 
195.35 - 247.56
15,765 5.69230.24 3,777 227.23 
247.57 - 277.95
112,934 5.33250.43 15,367 250.43 
277.96- 306.22
68,705 4.33305.46 33,875 305.46 
306.23 - 315.88
790 6.84306.98 — — 
315.89 - 324.77
2,264 4.60324.77 1,133 324.77 
Total559,001 4.01191.29 276,191 157.07 
Information for Restricted Stock Units under Equity Incentive Plan
The table below provides information for restricted stock units under the 2006 Equity Incentive Plan for the year ended December 31, 2020:
Shares    Weighted Average Grant Date Fair Value
Nonvested at December 31, 2019847,972 $236.54 
Granted460,671 199.51 
Vested(261,302)209.30 
Forfeited(52,292)225.66 
Nonvested at December 31, 2020995,049 227.12 
Summary of Information Regarding Stock Option and Restricted Stock Activity
The following table summarizes information regarding stock option and restricted stock unit activity during 2020, 2019 and 2018:
Year ended December 31,
(Dollars in thousands)202020192018
Total intrinsic value of stock options exercised$25,380 $23,088 $40,681 
Total grant date fair value of stock options vested5,868 5,735 5,823 
Total intrinsic value of restricted stock vested55,782 56,101 63,917 
Total grant date fair value of restricted stock vested47,237 35,191 28,813