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Stock-Based Incentive Plans (Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 7,810	$ 8,531	$ 26,845	$ 24,127
Share-based compensation arrangement, vesting period			4 years
Share-based compensation arrangement, compensation cost	3,300		$ 6,600
Service-based restricted stock units (“RSUs”)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	4,410	3,583	13,139	10,428
Service-based stock appreciation rights (“SARs”)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	3,211	2,896	9,185	7,804
Market performance-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 814	757	$ 2,745	2,146
Share-based compensation arrangement, vesting period	3 years		3 years
Operating performance-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ (962)	983	$ 882	2,752
Share-based compensation arrangement, vesting period			3 years
Employee share purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 337	$ 312	$ 894	$ 997

X

- 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
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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Amount of cost expensed and capitalized for award under share-based payment arrangement.

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-Name Accounting Standards Codification
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