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CAPITAL STOCK - Summary of Restricted Stock Activity (Details) - Restricted Shares - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Shares
Beginning balance (in shares)	593,341	326,545	219,317
Grants (in shares)	534,940	439,747	223,884
Vested (in shares)	(322,398)	(148,414)	(90,926)
Cancellations (in shares)	(10,296)	(24,537)	(25,730)
Ending balance (in shares)	795,587	593,341	326,545
Weighted- average grant date fair value
Beginning balance (usd per share)	$ 10.70	$ 14.63	$ 17.12
Grants (usd per share)	5.94	9.25	13.25
Vested (usd per share)	10.64	14.54	17.14
Cancellations (usd per share)	9.06	13.97	14.96
Ending balance (usd per share)	$ 7.54	$ 10.70	$ 14.63
Total unrecognized compensation expense remaining (in thousands)	$ 3,403
Weighted-average years expected to be recognized over	1 year 3 months 18 days

X

- Definition

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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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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The weighted average fair value at grant date for nonvested equity-based awards issued 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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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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