Share-Based Compensation (Share-Based CompensationShares Vesting During Year) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of vested shares on vesting date	$ 33,769	$ 32,317	$ 31,962
Cash paid for taxes upon vesting in lieu of issuing common shares	$ 12,162	$ 12,347	$ 14,092
Common shares issued upon vesting	96,479	97,516	82,060
Restricted share unit expense	$ 21,662	$ 53,869	$ 28,841
Restricted Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Taxes incurred upon vesting of restricted share units	$ 1,200	1,100	700
Reduction in compensation expense resulting from forfeitures			$ 4,600
Chief Executive Officer and Chief Financial Officer [Member] \| Restricted Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Acceleration of amortization on grants		$ 22,600

Common Stock Shares Issued Upon Vesting

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Increase (Decrease) in Share-Based Compensation Resulting from Forfeitures

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Restricted Stock Units, Taxes Incurred Upon Vesting

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- Definition

Amount of noncash expense for award of restricted stock or unit under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost.

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- Definition

Amount of cash paid to settle liability for award under share-based payment arrangement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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