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Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

In 2017, 2016 and 2015, we recorded share-based compensation and related benefits as follows:



	Year ended December 31,
(Dollars in thousands)	2017			2016			2015
Share-based compensation expense	$	36,900		$	35,494		$	32,239
Income tax benefit related to share-based compensation expense	(12,845		)	(12,505		)	(11,395		)
Capitalized compensation costs	1,071			5,580			2,226

As of December 31, 2017, unrecognized share-based compensation expense was as follows:



(Dollars in thousands)	Unrecognized Expense		Weighted Average Expected Recognition Period - in Years
Stock options	$	9,630	2.59
Restricted stock units	50,530		2.59
Total unrecognized share-based compensation expense	$	60,160

The following weighted average assumptions and fair values were used for our employee stock options and restricted stock units:



Equity Incentive Plan Awards	2017			2016			2015
Weighted average expected term of options - in years	4.9			4.8			4.7
Weighted average expected volatility of the Company's underlying common stock	33.7		%	31.7		%	31.3		%
Risk-free interest rate	1.81			1.32			1.49
Expected dividend yield	—			—			—
Weighted average grant date fair value - stock options	$	57.81		$	31.17		$	37.86
Weighted average grant date fair value - restricted stock units	181.23			100.35			129.23

The following weighted average assumptions and fair values were used for our ESPP:



ESPP	2017			2016			2015
Expected term in years	0.5			0.5			0.5
Weighted average expected volatility of the Company's underlying common stock	31.2		%	41.8		%	25.9		%
Risk-free interest rate	0.80			0.45			0.12
Expected dividend yield	—			—			—
Weighted average grant date fair value	$	41.70		$	29.16		$	29.27

The table below provides stock option information related to the 2006 Equity Incentive Plan for the year ended December 31, 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	116,995		179.39
Exercised	(302,744	)	71.65
Forfeited	(16,759	)	122.97
Outstanding at December 31, 2017	808,049		105.68		3.69	$	103,506,420
Vested and expected to vest at December 31, 2017	787,182		104.69		3.64	101,607,636
Exercisable at December 31, 2017	464,685		84.86		2.57	69,197,233

The following table summarizes information regarding stock options outstanding and exercisable as of December 31, 2017:



	Outstanding Options				Exercisable Options
Range of Exercise Prices	Shares	Weighted Average Remaining Contractual Life - in Years	Weighted Average Exercise Price		Shares	Weighted Average Exercise Price
$42.79 - 63.62	52,630	0.52	$	59.22	52,630	$	59.22
63.63 - 67.77	84,961	1.33	64.37		84,961	64.37
67.78 - 79.77	141,026	2.33	71.11		141,026	71.11
79.78 - 105.14	11,686	3.67	98.17		7,336	96.09
105.15 - 105.84	154,345	5.33	105.18		31,958	105.18
105.85 - 108.59	148,456	3.32	107.96		101,824	107.95
108.60 - 149.65	102,306	4.27	128.65		44,950	128.13
149.66 - 180.62	108,266	6.34	178.15		—	—
180.63 - 217.69	4,373	6.80	210.42		—	—
Total	808,049	3.69	105.68		464,685	84.86

The table below provides information for restricted stock units under the 2006 Equity Incentive Plan for the year ended December 31, 2017:



	Shares		Weighted Average Grant Date Fair Value
Nonvested at December 31, 2016	670,969		$	106.64
Granted	247,591		181.23
Vested	(228,198	)	102.47
Forfeited	(52,695	)	121.52
Nonvested at December 31, 2017	637,667		135.86

The following table summarizes information regarding stock option and restricted stock unit activity during 2017, 2016 and 2015:



	Year ended December 31,
(Dollars in thousands)	2017		2016		2015
Total intrinsic value of stock options exercised	$	36,173	$	18,186	$	27,430
Total grant date fair value of stock options vested	6,094		7,364		21,052
Total intrinsic value of restricted stock vested	40,925		22,966		34,009
Total grant date fair value of restricted stock vested	23,383		19,454		19,428