Share-Based Arrangements (Compensation Arrangements by Share-based Payment Award) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	$ 4,979	$ 4,669	$ 5,484
Continuing Operations [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	5,000	4,700	5,500
Discontinued Operations, Disposed of by Sale [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	$ 0	2,900	$ 1,000
Share Based Compensation Arrangement by Share Based Payment Award Plan Modification Reduction in Compensation Cost		(400)
Share-based Payment Arrangement, Accelerated Cost		2,800
Share based Compensation Arrangement by Share based Payment Award Accelerated Compensation Cost and Modification		2,400
Discontinued Operations
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense		$ 500

Share Based Compensation Arrangement by Share Based Payment Award Plan Modification Reduction in Compensation Cost

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- Definition

Share based Compensation Arrangement by Share based Payment Award Accelerated Compensation Cost and Modification

+ References

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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

+ References

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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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