Equity and Cash Incentive Program - Other Information Regarding the Exercise of SARs (Details) - Stock Appreciation Rights (SARs) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of SARs that became exercisable	$ 662	$ 310	$ 1,239
Aggregate intrinsic value of SARs exercised	$ 629	$ 40	$ 2,787

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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