CAPITAL STOCK, Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	246,000
Stock Option Activity [Roll Forward]
Cash received from the exercise of stock options	$ 1,600	$ 500
Share-based Payment Arrangement, Option [Member]
Stock Option Activity [Roll Forward]
Options outstanding at beginning of period (in shares)	565,000	891,892	2,290,017
Granted (in shares)	0
Exercised (in shares)	(319,000)	(70,006)
Forfeited or canceled (in shares)	0	(256,886)	(1,398,125)
Options outstanding at end of period (in shares)	246,000	565,000	891,892	2,290,017
Weighted-average exercise price, options outstanding at beginning of period (in dollars per share)	$ 7.57	$ 8.46	$ 9.65
Weighted-average exercise price, options granted (in dollars per share)	0
Weighted-average exercise price, options exercised (in dollars per share)	7.65	7.39
Weighted-average exercise price, options forfeited or canceled (in dollars per share)	0	10.70	10.42
Weighted-average exercise price, options outstanding at end of period (in dollars per share)	$ 7.48	$ 7.57	$ 8.46	$ 9.65
Weighted-average remaining contractual term of options outstanding (in years)	5 months 8 days	1 year 2 months 1 day	1 year 6 months 18 days	2 years 3 months 21 days
Aggregate intrinsic value options outstanding	$ 1,358	$ 571
Share-based Payment Arrangement, Option [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	7 years
Share-based Payment Arrangement, Option [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Non-employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year