401(k) Plan

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Represents the first level of employee contributions (percentage of compensation) which are matched by the employer.

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Represents the second level of employee contributions (percentage of compensation) which are partially matched by the employer.

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Represents the employer matching contribution of the first level of qualified compensation.

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Represents the employer matching contribution of the second level of qualified compensation.

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Employee Stock Purchase Plan [Abstract]

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instrument Other Than Options, Common Stock Conversion Ratio

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- Definition

Share-based Compensation By Share-based Payment Award, Common Stock Earned As A Percentage of Targeted Performance Stock Units

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- Definition

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

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- Definition

Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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- Definition

Amount of cost for defined contribution plan.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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No definition available.

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- Definition

Amount of cost (reversal of cost) for pension benefits. Excludes other postretirement benefits.

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No definition available.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

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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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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- Definition

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

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Percentage of vesting of award under share-based payment arrangement.

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Purchase price of common stock expressed as a percentage of its fair value.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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STOCK OWNERSHIP AND BENEFIT PLANS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended			50 Months Ended	129 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Sep. 21, 2016	Nov. 04, 2016
Stock ownership and benefit plans [Line Items]
Number of shares authorized (in shares)							5,000,000
Number of shares available for future grant (in shares)	2,535,020	2,535,020			2,535,020	3,360,119
401(k) Plan [Abstract]
Matching employer contributions on first level of qualified compensation (as a percent)		100.00%
Percentage of qualified compensation, first level, matched by employer		3.00%
Matching employer contributions on second level of qualified compensation (as a percent)		50.00%
Percentage of qualified compensation, second level, matched by employer		2.00%
Total DMC contributions		$ 1,069	$ 1,156	$ 828
Defined Benefit Plans [Abstract]
Unfunded pension obligation	$ 2,404	2,404	2,079		$ 2,404
Net adjustments recognized		122	$ 406	$ 10
Pension Plan
401(k) Plan [Abstract]
Total DMC contributions		$ 323
Minimum \| Pension Plan
Defined Benefit Plans [Abstract]
Percent of employees gross pay	1.50%
Maximum \| Pension Plan
Defined Benefit Plans [Abstract]
Percent of employees gross pay	4.50%
Restricted stock and restricted stock units
Stock ownership and benefit plans [Line Items]
Aggregate number of shares granted (in shares)						1,639,881
Unvested RSUs
Stock ownership and benefit plans [Line Items]
Common stock conversion ratio (in shares)		1
Unvested PSUs \| Minimum
Stock ownership and benefit plans [Line Items]
Eligible shares of common stock earned as a percentage of targeted PSUs awarded		0.00%
Unvested PSUs \| Maximum
Stock ownership and benefit plans [Line Items]
Eligible shares of common stock earned as a percentage of targeted PSUs awarded		200.00%
Employee stock
Stock ownership and benefit plans [Line Items]
Number of shares authorized (in shares)	850,000	850,000			850,000
Number of shares available for future grant (in shares)	206,350	206,350			206,350
Employee Stock Purchase Plan [Abstract]
Percentage of earnings that may be authorized by employees to withhold to purchase common stock	15.00%	15.00%			15.00%
Stock purchased (in shares)		18,462	16,553	18,100
Stock-based compensation		$ 133	$ 159	$ 121
Employee stock \| Maximum
Employee Stock Purchase Plan [Abstract]
Percentage of fair market value of the entity's common stock used to purchase common stock on the Offering Date or Purchase Date		85.00%
Restricted stock awards and restricted stock units, and performance share units
Stock ownership and benefit plans [Line Items]
Aggregate number of shares granted (in shares)					825,099
First anniversary \| Restricted stock awards and restricted stock units, time-based
Stock ownership and benefit plans [Line Items]
Vesting percentage		33.33%
Second anniversary \| Restricted stock awards and restricted stock units, time-based
Stock ownership and benefit plans [Line Items]
Vesting percentage		33.33%
Third anniversary \| Restricted stock awards and restricted stock units, time-based
Stock ownership and benefit plans [Line Items]
Vesting percentage		33.33%
Achievement Of Targeted Adjusted EBITDA \| Phantom Share Units Granted In 2020
Stock ownership and benefit plans [Line Items]
Vesting percentage		25.00%
Achievement Of Targeted Adjusted EBITDA \| Phantom Share Unis Granted Prior to 2020
Stock ownership and benefit plans [Line Items]
Vesting percentage			50.00%
Achievement Of Relative TSR Performance \| Phantom Share Units Granted In 2020
Stock ownership and benefit plans [Line Items]
Vesting percentage		75.00%
Achievement Of Relative TSR Performance \| Phantom Share Unis Granted Prior to 2020
Stock ownership and benefit plans [Line Items]
Vesting percentage			50.00%