Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2020

Share-based Payment Arrangement [Abstract]

Share-based Compensation and Related Benefits

For the three and six months ended June 30, 2020 and 2019, we recorded share-based compensation and related tax benefits as follows: 

	Three months ended June 30,						Six months ended June 30,
(Dollars in thousands)	2020			2019			2020			2019
Share-based compensation expense	$	20,154		$	16,646		$	39,325		$	31,768
Income tax benefit related to share-based compensation expense	(4,727		)	(3,817		)	(9,167		)	(7,144		)

Unrecognized Share-based Compensation Expense

As of June 30, 2020, unrecognized share-based compensation expense was as follows:

(Dollars in thousands)	Unrecognized   Expense		Weighted Average Expected Recognition Period  - in Years
Stock options	$	17,048	2.78
Restricted stock units and awards	134,908		2.85
Total unrecognized share-based compensation expense	$	151,956

Stock Option Information Related to Equity Incentive Plan

The table below provides stock option information related to the 2006 Equity Incentive Plan for the six months ended June 30, 2020:

	Options		Weighted Average  Exercise Price		Weighted Average Remaining Contractual Life - in Years	Aggregate   Intrinsic Value   of In-The- Money Options
Outstanding at December 31, 2019	625,407		$	169.33
Granted	119,472		185.52
Exercised	(82,896	)	89.71
Forfeited	(11,585	)	226.95
Expired	(1,030	)	71.11
Outstanding at June 30, 2020	649,368		181.60		4.11	$	32,958,101
Vested and expected to vest at June 30, 2020	622,501		180.01		4.02	32,492,850
Exercisable at June 30, 2020	367,008		148.46		2.67	28,597,666

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 six months ended June 30, 2020:

	Shares		Weighted Average Grant Date Fair Value
Nonvested at December 31, 2019	847,972		$	236.54
Granted	402,546		188.64
Vested	(238,460	)	207.50
Forfeited	(39,817	)	227.23
Nonvested at June 30, 2020	972,241		224.21