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Other Matters (Details) - Mr. John Schaefer shares in Thousands, $ in Thousands	Mar. 13, 2018 USD ($) shares
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Aggregate amount subject to tax withholdings and other deductions	$ 1,509
Period for payment	18 months
Number of unvested shares subject to accelerated vesting | shares	242
Expense incurred	$ 1,138

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- Definition

Amount of cash outflows to satisfy retirement obligations subject to tax withholdings and other deductions.

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Period for payment of retirement obligations.

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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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- Definition

Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.

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Number of shares for which recognition of compensation cost was accelerated.

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