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Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]  
Share-based Compensation and Related Benefits
For the three months ended March 31, 2021 and 2020, we recorded share-based compensation and related tax benefits as follows: 
 Three months ended March 31,
(Dollars in thousands)20212020
Share-based compensation expense$26,691 $19,171 
Income tax benefit related to share-based compensation expense
(6,278)(4,440)
Unrecognized Share-based Compensation Expense
As of March 31, 2021, unrecognized share-based compensation expense was as follows:
(Dollars in thousands)  Unrecognized  
Expense		Weighted Average Expected
Recognition Period 
- in Years  
Stock options$12,059 2.26
Restricted stock units and awards127,759 2.65
Total unrecognized share-based compensation expense$139,818 
Stock Option Information Related to Equity Incentive Plan
The table below provides stock option information related to the 2006 Equity Incentive Plan for the three months ended March 31, 2021:
OptionsWeighted
Average
 Exercise Price 		Weighted Average Remaining Contractual Life - in Years  Aggregate
  Intrinsic Value  
of In-The-
Money
Options
Outstanding at December 31, 2020559,001 $191.29 
Exercised(83,516)136.14 
Forfeited(604)254.35 
Outstanding at March 31, 2021474,881 200.91 4.17$139,021,519 
Vested and expected to vest at March 31, 2021457,920 200.35 4.12134,311,416 
Exercisable at March 31, 2021193,079 166.23 2.5863,219,304 
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 three months ended March 31, 2021:
Shares    Weighted Average Grant Date Fair Value
Nonvested at December 31, 2020995,049 $227.12 
Granted57,323 499.90 
Vested(73,716)256.76 
Forfeited(17,579)263.28 
Nonvested at March 31, 2021961,077 240.46