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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Share-based Compensation and Related Benefits
For the three and nine months ended September 30, 2020 and 2019, we recorded share-based compensation and related tax benefits as follows: 
 Three months ended September 30,Nine months ended September 30,
(Dollars in thousands)2020201920202019
Share-based compensation expense$21,408 $18,782 $60,733 $50,550 
Income tax benefit related to share-based compensation expense
(5,560)(4,883)(14,726)(12,028)
Unrecognized Share-based Compensation Expense
As of September 30, 2020, unrecognized share-based compensation expense was as follows:
(Dollars in thousands)  Unrecognized  
Expense		Weighted Average Expected
Recognition Period 
- in Years  
Stock options$15,541 2.60
Restricted stock units and awards125,321 2.68
Total unrecognized share-based compensation expense$140,862 
Stock Option Information Related to Equity Incentive Plan
The table below provides stock option information related to the 2006 Equity Incentive Plan for the nine months ended September 30, 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 
Granted123,301 186.83 
Exercised(130,330)99.72 
Forfeited(15,460)231.75 
Expired(1,030)71.11 
Outstanding at September 30, 2020601,888 186.55 4.08$38,405,994 
Vested and expected to vest at September 30, 2020578,024 185.26 4.00$37,654,264 
Exercisable at September 30, 2020317,896 152.61 2.59$30,524,026 
Information for Restricted Stock Units under Equity Incentive Plan
The table below provides information for restricted stock units and awards under the 2006 Equity Incentive Plan for the nine months ended September 30, 2020:
Shares    Weighted Average Grant Date Fair Value
Nonvested at December 31, 2019847,972 $236.54 
Granted426,071 190.79 
Vested(247,370)207.82 
Forfeited(49,272)226.32 
Nonvested at September 30, 2020977,401 224.38