Share-based Compensation and Non-Qualified Deferred Compensation Plan (Tables)

9 Months Ended

Sep. 30, 2015

Share-based Compensation [Abstract]

Schedule of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range And Intrinsic Value

The following table summarizes outstanding share options, all of which were exercisable, at September 30, 2015:

	Options Outstanding and Exercisable (1)
Range of Exercise Prices	Number	Weighted Average Price
$30.06	105,015	$	30.06
$41.16 - $43.94	119,242	42.46
$48.02 - $75.17	70,948	60.92
Total options	295,205	$	42.49

(1) The aggregate intrinsic value of options outstanding and exercisable at September 30, 2015 was $9.3 million. The aggregate intrinsic value was calculated as the excess, if any, between our closing share price of $73.90 per share on September 30, 2015 and the strike price of the underlying award.

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The following assumptions were used for the reload options granted during the nine months ended September 30, 2015:

	Nine Months Ended September 30, 2015
Weighted average fair value of options granted	$5.52 - $7.38
Expected volatility	16.5% - 18.8%
Risk-free interest rate	1.0% - 1.3%
Expected dividend yield	3.5% - 3.7%
Expected life	3 years - 4 years

Summary of Share Incentive Plans

The following table summarizes activity under our share incentive plans for the nine months ended September 30, 2015:

	Options Outstanding		Weighted Average Exercise / Grant Price		Nonvested Share Awards Outstanding		Weighted Average Exercise /  Grant Price
Options and nonvested share awards outstanding at December 31, 2014	321,811		$	38.97	818,943		$	63.39
Granted	26,752		75.17		256,599		74.53
Exercised/Vested	(53,358	)	37.69		(299,806	)	60.42
Forfeited	—		—		(9,297	)	67.78
Total options and nonvested share awards outstanding at September 30, 2015	295,205		$	42.49	766,439		$	68.22

Summary of non-qualified deferred compensation share award activity

The following table summarizes the eligible share award activity as recorded in temporary equity for the nine months ended September 30, 2015:

(in thousands)	Nine Months Ended September 30, 2015
Temporary equity:
Balance at December 31, 2014	$	68,134
Change in classification	7,924
Change in redemption value	(184		)
Diversification of share awards	(3,558		)
Balance at September 30, 2015	$	72,316