Stock-Based Incentive Plans - Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement, compensation cost	$ 100
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement, vesting period	2 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement, vesting period	4 years
Continuing Operations
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 9,536	$ 9,043
Service-based restricted stock units (“RSUs”) \| Continuing Operations
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	4,842	4,478
Service-based stock appreciation rights (“SARs”) \| Continuing Operations
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 3,322	2,684
Market performance-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement, vesting period	3 years
Market performance-based restricted stock units \| Continuing Operations
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 763	896
Operating performance-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement, vesting period	3 years
Operating performance-based restricted stock units \| Continuing Operations
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 267	695
Employee share purchase plan \| Continuing Operations
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 342	$ 290

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

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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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