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Share-Based Compensation and Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2016

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 December 31, 2016:

		Options Outstanding and Exercisable (1)
Exercise Prices		Number			Weighted Average Price
$30.06		65,460			$	30.06
$75.17		26,752			75.17
$85.05		12,854			85.05
Total options		105,066			$	48.27

(1) The aggregate intrinsic value of options outstanding and exercisable at December 31, 2016 was approximately $3.8 million. The aggregate intrinsic value was calculated as the excess, if any, between our closing share price of $84.07 per share on December 31, 2016 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 years ended December 31, 2016, 2015 and 2014:

		Year Ended December 31, 2016		Year Ended December 31, 2015		Year Ended December 31, 2014
Weighted average fair value of options granted		$6.71		$5.52 - $7.38		$3.55 - $8.17
Expected volatility		18.0%		16.5% - 18.8%		22.6% - 23.2%
Risk-free interest rate		0.9%		1.0% - 1.3%		0.1% - 1.1%
Expected dividend yield		3.8%		3.5% - 3.7%		3.5%
Expected life		3 years		3 years - 4 years		6 months - 4 years

Summary Of Share Incentive Plans

The following table summarizes activity under our share incentive plans for the three years ended December 31:

	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, 2013	634,361			$	41.59			831,298			$	59.77
Granted	84,452			64.75				314,614			65.78
Exercised/Vested	(375,316	)		47.85				(305,372	)		55.97
Forfeited	(21,686	)		62.32				(21,597	)		64.14
Balance at December 31, 2014	321,811			$	38.97			818,943			$	63.39
Granted	26,752			75.17				257,749			74.53
Exercised/Vested	(53,358	)		37.69				(313,628	)		61.10
Forfeited	—			—				(12,818	)		67.96
Balance at December 31, 2015	295,205			$	42.49			750,246			$	68.09
Granted	12,854			85.05				270,978			74.92
Exercised/Vested	(202,993	)		42.19				(398,492	)		68.16
Forfeited	—			—				(18,245	)		70.63
Total options and nonvested share awards outstanding at December 31, 2016	105,066			$	48.27			604,487			$	71.03

Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block]

The following table presents information related to our ESPP:

	2016				2015				2014
Shares purchased	20,797				14,655				25,728
Weighted average fair value of shares purchased	$	82.33			$	74.66			$	71.19
Expense recorded (in millions)	$	0.4			$	0.2			$	0.5

Temporary Equity [Table Text Block]

The following table summarizes the eligible share award activity for the twelve months ended December 31:

(in thousands)		2016				2015
Temporary equity:
Balance at inception/beginning of period		$	79,364			$	68,134
Change in classification		13,956				10,999
Change in redemption value		9,145				3,788
Diversification of share awards		(25,428		)		(3,557		)
Balance at December 31		$	77,037			$	79,364

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.

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Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value.

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Tabular disclosure of employee stock purchase plan activity.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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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.

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-Paragraph 2
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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.

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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
-Name Accounting Standards Codification
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-Section S99
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