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

6 Months Ended

Jun. 30, 2018

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 June 30, 2018:

		Options Outstanding and Exercisable (1)
Range of Exercise Prices		Number			Weighted Average Price
$75.17		15,388			$	75.17
$78.55		9,994			78.55
$80.89 - $85.05		27,476			82.84
Total options		52,858			$	79.79

(1) The aggregate intrinsic value of options outstanding and exercisable at June 30, 2018 was $0.6 million. The aggregate intrinsic value was calculated as the excess, if any, between our closing share price of $91.13 per share on June 30, 2018 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 six months ended June 30, 2018:

	Six Months Ended June 30, 2018
Weighted average fair value of options granted	4.11
Expected volatility	15.1%
Risk-free interest rate	2.0%
Expected dividend yield	3.3%
Expected life	1 year

Summary of Share Incentive Plans

The following table summarizes activity under our share incentive plans for the six months ended June 30, 2018:

	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, 2017	68,978			$	61.15			499,898			$	75.80
Granted	9,994			78.55				230,353			82.73
Exercised/Vested	(26,114	)		30.06				(315,789	)		75.65
Forfeited	—			—				(13,478	)		79.26
Total options and nonvested share awards outstanding at June 30, 2018	52,858			$	79.79			400,984			$	79.77

Summary of non-qualified deferred compensation share award activity

The following table summarizes the eligible share award activity for the six months ended June 30, 2018:

(in thousands)		Six Months Ended June 30, 2018
Temporary equity:
Balance at December 31, 2017		$	77,230
Change in classification		10,635
Change in redemption value		(976		)
Diversification of share awards		(951		)
Balance at June 30, 2018		$	85,938

X

- Definition

Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and aggregate intrinsic value.

+ References

No definition available.

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- Definition

Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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-Publisher FASB
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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Tabular disclosure of temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764

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-Publisher FASB
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