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CAPITAL STOCK - Summary of Performance-based Award Activity (Details) - Performance-based awards - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of shares
Beginning balance (in shares)	339,287	228,892	145,962
Grants (in shares)	158,525	182,300	87,000
Vested (in shares)	(66,761)	(58,888)
Cancellations (in shares)	(25,992)	(13,017)	(4,070)
Ending balance (in shares)	405,059	339,287	228,892
Total unrecognized compensation expense remaining (in thousands)	$ 1,845
Weighted-average grant date fair value
Beginning balance (usd per share)	$ 14.82	$ 16.49	$ 15.32
Grants (usd per share)	9.19	12.81	18.45
Vested (usd per share)	15.69	14.84
Cancellations (usd per share)	15.44	15.95	16.52
Ending balance (usd per share)	$ 12.43	$ 14.82	$ 16.49
Weighted-average years expected to be recognized over	1 year 7 months 6 days

X

- Definition

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

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- Definition

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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- Definition

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

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- Definition

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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- 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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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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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

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- Definition

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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