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Share-based Compensation and Non-Qualified Deferred Compensation Plan (Narrative) (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) shares	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) shares $ / shares	Jun. 30, 2018 USD ($) $ / shares	May 17, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares			$ 98.71	$ 82.73
Total compensation cost for option and share awards | $	$ 4,700	$ 4,300	$ 9,300	$ 8,800
Total capitalized compensation cost for option and share awards | $	900	$ 800	1,800	1,600
Share Awards and Vesting [Member]
Total unrecognized compensation cost which is expected to be amortized | $	$ 21,300		$ 21,300
Expected amortized period of unrecognized compensation expected to be recognized for share-based compensation plans			3 years
Fair value of shares vested | $			$ 20,700	$ 23,900
Maximum [Member] | Share Awards and Vesting [Member]
Vesting period, years			5 years
Two Thousand Eighteen Share Incentive Plan [Member]
Total common shares available | shares	7,500,000		7,500,000		9,700,000
Common shares To Full Value Award Conversion Ratio			3.45
Value Of Option Right Or Other Award In The Fungible Unit Conversion | shares			1.0
Full Value award in the common share conversion ratio | shares			1.0
Common shares which could be granted pursuant to full value awards | shares	2,200,000		2,200,000

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- Definition

Common shares which could be granted pursuant to full value awards based on the 3.45 to 1.0 fungible unit-to-full value award conversion ratio.

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The full value award in the fungible unit to full value award conversion ratio regarding the shares from the 2002 share incentive plan transferred into the 2011 share incentive plan.

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The award conversion ratio regarding the shares from the 2002 share incentive plan transferred into the 2011 share incentive plan.

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Equity-based compensation cost during the period with respect to the award, which was recognized in income.

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An option, right, or other award which does not deliver the full value at date of grant and expires five years or less from the date of grant counts against the Fungible Pool Limit as this portion of a fungible pool unit

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Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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