Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2017

For the three and six months ended June 30, 2017 and 2016, we recorded share-based compensation and related tax benefits as follows:



	Three months ended June 30,						Six months ended June 30,
(Dollars in thousands)	2017			2016			2017			2016
Share-based compensation expense	$	9,892		$	7,548		$	19,095		$	14,425
Income tax benefit related to share-based compensation expense	(3,349		)	(4,581		)	(6,364		)	(6,698		)

As of June 30, 2017, unrecognized share-based compensation expense was as follows:



(Dollars in thousands)	Unrecognized Expense		Weighted Average Expected Recognition Period - in Years
Stock options	$	12,309	2.88
Restricted stock units	62,942		2.89
Total unrecognized share-based compensation expense	$	75,251

The table below provides stock option information related to the 2006 Equity Incentive Plan for the six months ended June 30, 2017:



	Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life - in Years	Aggregate Intrinsic Value of In-The- Money Options
Outstanding at December 31, 2016	1,010,557		$	87.24
Granted	111,855		178.16
Exercised	(196,006	)	69.93
Forfeited	(3,662	)	93.88
Outstanding at June 30, 2017	922,744		101.91		4.00	$	68,457,617
Vested and expected to vest at June 30, 2017	893,276		100.71		3.94	67,315,191
Exercisable at June 30, 2017	568,202		82.89		2.95	52,783,813

The table below provides information for restricted stock units under the 2006 Equity Incentive Plan for the six months ended June 30, 2017:



	Shares		Weighted Average Grant Date Fair Value
Nonvested at December 31, 2016	670,969		$	106.64
Granted	230,822		179.94
Vested	(218,336	)	102.07
Forfeited	(16,078	)	117.29
Nonvested at June 30, 2017	667,377		133.23