SHARE-BASED COMPENSATION PLANS

A summary of share-based compensation expense included in net income is as follows:



	Year Ended December 31,
	2017			2016			2015
	(In thousands)

Grants of common shares and options	$	12,371		$	11,227		$	12,074
Capitalized share-based compensation	(1,385		)	(1,310		)	(868		)
Share-based compensation expense	$	10,986		$	9,917		$	11,206

As of December 31, 2017, we have grants outstanding under two share-based compensation plans. In May 2010, our shareholders approved the 2010 Performance Incentive Plan, as amended (the "2010 Plan”), which authorized the grant of share options, common shares and other share-based awards for up to 2,450,000 common shares of beneficial interest. Our 2001 Long Term Incentive Plan (the “2001 Plan”), which expired in May 2010, authorized the grant of share options, common shares and other share-based awards of 3,250,000 common shares of beneficial interest.

Option awards under both plans are required to have an exercise price at least equal to the closing trading price of our common shares on the date of grant. Options and restricted share awards under these plans generally vest over three to seven years and option awards typically have a ten-year contractual term. We pay dividends on unvested shares. Certain options and share awards provide for accelerated vesting if there is a change in control. Additionally, the vesting on certain option and share awards can accelerate in part or in full upon retirement based on the age of the retiree or upon termination without cause.

The fair value of each option award is estimated on the date of grant using the Black-Scholes model. Expected volatilities, term, dividend yields, employee exercises and estimated forfeitures are primarily based on historical data. The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant. The fair value of each share award is determined based on the closing trading price of our common shares on the grant date. No options were granted in 2017 and 2015.

The following table provides a summary of the weighted-average assumption used to value options granted in 2016:



Volatility	18.8	%
Expected dividend yield	2.8	%
Expected term (in years)	6.0
Risk free interest rate	1.5	%

The following table provides a summary of option activity for 2017:



	Shares Under Option		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value
					(In years)	(In thousands)
Outstanding at December 31, 2016	259,119		$	56.66
Granted	—		—
Exercised	(152,634	)	65.37
Forfeited or expired	—		—
Outstanding at December 31, 2017	106,485		$	44.18	1.2	$	9,451
Exercisable at December 31, 2017	105,939		$	43.62	1.1	$	9,451

The weighted-average grant-date fair value of options granted in 2016 was $19.52 per share. The total cash received from options exercised during 2017, 2016 and 2015 was $10.0 million, $4.5 million and $2.0 million, respectively. The total intrinsic value of options exercised during the years ended December 31, 2017, 2016 and 2015 was $10.7 million, $4.2 million and $2.1 million, respectively.

The following table provides a summary of restricted share activity for 2017:



	Shares		Weighted-Average Grant-Date Fair Value
Unvested at December 31, 2016	217,353		$	142.70
Granted	109,815		139.31
Vested	(87,704	)	131.55
Forfeited	(2,293	)	142.09
Unvested at December 31, 2017	237,171

The weighted-average grant-date fair value of stock awarded in 2017, 2016 and 2015 was $139.31, $152.70 and $141.08, respectively. The total vesting-date fair value of shares vested during the year ended December 31, 2017, 2016 and 2015, was $12.5 million, $13.8 million and $26.1 million, respectively.

As of December 31, 2017, there was $17.6 million of total unrecognized compensation cost related to unvested share-based compensation arrangements (i.e. options and unvested shares) granted under our plans. This cost is expected to be recognized over the next 6.4 years with a weighted-average period of 2.2 years.

Subsequent to December 31, 2017, common shares were awarded under various compensation plans as follows:



Date	Award		Vesting Term	Beneficiary
January 2, 2018	5,416	Shares	Immediate	Trustees
February 7, 2018	92,552	Restricted shares	3-4 years	Officers and key employees
February 7, 2018	488	Options	5 years	Officers and key employees