Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

For the three months ended March 31, 2018 and 2017, we recorded share-based compensation and related tax benefits as follows:



	Three months ended March 31,
(Dollars in thousands)	2018			2017
Share-based compensation expense	$	10,523		$	9,203
Income tax benefit related to share-based compensation expense	(2,317		)	(3,015		)

As of March 31, 2018, unrecognized share-based compensation expense was as follows:



(Dollars in thousands)	Unrecognized Expense		Weighted Average Expected Recognition Period - in Years
Stock options	$	8,290	2.48
Restricted stock units	46,036		2.48
Total unrecognized share-based compensation expense	$	54,326

The table below provides stock option information related to the 2006 Equity Incentive Plan for the three months ended March 31, 2018:



	Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life - in Years	Aggregate Intrinsic Value of In-The- Money Options
Outstanding at December 31, 2017	808,049		$	105.68
Granted	471		260.72
Exercised	(51,271	)	68.05
Forfeited	(1,926	)	130.69
Outstanding at March 31, 2018	755,323		108.26		3.61	$	99,521,692
Vested and expected to vest at March 31, 2018	738,585		107.43		3.57	97,934,520
Exercisable at March 31, 2018	416,281		87.28		2.50	63,585,697

The table below provides information for restricted stock units under the 2006 Equity Incentive Plan for the three months ended March 31, 2018:



	Shares		Weighted Average Grant Date Fair Value
Nonvested at December 31, 2017	637,667		$	135.86
Granted	10,699		237.94
Vested	(42,171	)	126.23
Forfeited	(13,332	)	132.87
Nonvested at March 31, 2018	592,863		138.46