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

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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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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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Number of shares authorized for issuance under share-based payment arrangement.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Per share or per unit amount of equity securities issued.

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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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Stock Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	924,823			924,823
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Applicable vesting period				3 years
Unrecognized compensation expense	$ 4,783	$ 2,249		$ 4,783	$ 2,249
Expected weighted-average term				2 years 7 months 6 days
Shares surrendered (in shares)			0	3,874
Restricted Stock \| Selling, general and administrative expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs	456	357		$ 745	1,121
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Applicable vesting period				3 years
Unrecognized compensation expense	$ 112	260		$ 112	260
Expected weighted-average term				5 years
Grant price (in USD per share)	$ 10			$ 10
Average remaining contractual term				2 years 9 months 18 days
Aggregate intrinsic value	$ 961			$ 961
Weighted-average period costs are expected to be recognized				9 months 18 days
Stock Appreciation Rights (SARs) \| Selling, general and administrative expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs	$ 31	$ 31		$ 60	$ 55