Share-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

For the three and nine months ended September 30, 2018 and 2017, we recorded share-based compensation and related tax benefits as follows:



	Three months ended September 30,						Nine months ended September 30,
(Dollars in thousands)	2018			2017			2018			2017
Share-based compensation expense	$	11,501		$	8,644		$	33,968		$	27,739
Income tax benefit related to share-based compensation expense	(2,895		)	(3,154		)	(7,955		)	(9,518		)

As of September 30, 2018, unrecognized share-based compensation expense was as follows:



(Dollars in thousands)	Unrecognized Expense		Weighted Average Expected Recognition Period - in Years
Stock options	$	13,525	2.91
Restricted stock units	73,037		2.74
Total unrecognized share-based compensation expense	$	86,562

The table below provides stock option information related to the 2006 Equity Incentive Plan for the nine months ended September 30, 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	89,616		305.71
Exercised	(191,585	)	83.37
Forfeited	(9,498	)	187.76
Expired	(2,337	)	60.37
Outstanding at September 30, 2018	694,245		136.68		3.76	$	120,932,288
Vested and expected to vest at September 30, 2018	673,674		134.25		3.70	118,982,041
Exercisable at September 30, 2018	415,993		99.63		2.66	87,856,349

The table below provides information for restricted stock units under the 2006 Equity Incentive Plan for the nine months ended September 30, 2018:



	Shares		Weighted Average Grant Date Fair Value
Nonvested at December 31, 2017	637,667		$	135.86
Granted	193,405		302.53
Vested	(213,944	)	130.20
Forfeited	(37,080	)	170.97
Nonvested at September 30, 2018	580,048		191.28