Share-Based Compensation Plans

12 Months Ended

Dec. 31, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

SHARE-BASED COMPENSATION PLANS

SHARE-BASED COMPENSATION PLANS

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

	Year Ended December 31,
	2012			2011			2010
	(In thousands)
Share-based compensation incurred
Grants of common shares	$	9,846		$	7,308		$	5,232
Grants of options	525			939			1,255
	10,371			8,247			6,487
Capitalized share-based compensation	(908		)	(663		)	(745		)
Share-based compensation expense	$	9,463		$	7,584		$	5,742

As of December 31, 2012, 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 six 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 2012 and 2011.

The following table provides a summary of the weighted-average assumption used to value options in 2010:

	Year Ended December 31,
	2010
Volatility	30.0	%
Expected dividend yield	4.0	%
Expected term (in years)	4.3
Risk free interest rate	1.9	%

The following table provides a summary of option activity for 2012:

	Shares Under Option		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value
					(In years)	(In thousands)
Outstanding at December 31, 2011	517,653		$	61.08
Granted	—		—
Exercised	(97,430	)	58.46
Forfeited or expired	(29,334	)	44.61
Outstanding at December 31, 2012	390,889		$	62.96	5.2	$	16,048
Exercisable at December 31, 2012	293,946		$	65.66	5.0	$	11,276

The weighted-average grant-date fair value of options granted during 2010 was $11.77 per share. The total cash received from options exercised during 2012, 2011 and 2010 was $5.7 million, $15.2 million and $4.2 million, respectively. The total intrinsic value of options exercised during the year ended December 31, 2012, 2011 and 2010 was $4.2 million, $5.6 million and $4.2 million, respectively.

The following table provides a summary of restricted share activity for 2012:

	Shares		Weighted-Average Grant-Date Fair Value
Unvested at December 31, 2011	282,837		$	74.00
Granted	126,169		96.35
Vested	(106,804	)	72.78
Forfeited	(14,522	)	53.76
Unvested at December 31, 2012	287,680		$	85.28

The weighted-average grant-date fair value of stock awarded in 2012, 2011 and 2010 was $96.35, $81.94 and $73.51, respectively. The total vesting-date fair value of shares vested during the year ended December 31, 2012, 2011 and 2010, was $10.3 million, $6.3 million and $4.3 million, respectively.

As of December 31, 2012, there was $15.3 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 4.6 years with a weighted-average period of 2.3 years.

Subsequent to December 31, 2012, common shares were awarded under various compensation plans as follows:

Date	Award		Vesting Term	Beneficiary
February 7, 2013	98,913	Restricted shares	3 years	Officers and key employees
January 2, 2013	5,767	Shares	Immediate	Trustees