NET INCOME (LOSS) PER COMMON SHARE (Tables)

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Net Income (Loss) Per Common Share

	Year ended December 31,
	2019			2018			2017
	(thousands of dollars)
Net income (loss) from continuing operations	$	(12,884	)	$	(1,728	)	$	21,512
Basic income (loss) from continuing operations per common share:
Weighted average shares outstanding	24,698			24,438			24,294
Per share amount (dollars)	$	(0.52	)	$	(0.07	)	$	0.89
Diluted income (loss) from continuing operations per common share:
Weighted average shares outstanding	24,698			24,438			25,129
Per share amount (dollars)	$	(0.52	)	$	(0.07	)	$	0.86
Weighted average shares-denominator   basic computation	24,698			24,438			24,294
Unvested restricted stock unit grant	—			—			367
Effect of dilutive stock options	—			—			468
Weighted average shares, as adjusted   denominator diluted computation	24,698			24,438			25,129

Net Income per Common Share - Discontinued Operations

	Year ended December 31,
	2019			2018			2017
	(thousands of dollars)
Net loss from discontinued operations	$	(2,090	)	$	(604	)	$	(3,503	)
Basic income (loss) from discontinued operations per common share:
Weighted average shares outstanding	24,698			24,438			24,294
Per share amount (dollars)	$	(0.08	)	$	(0.02	)	$	(0.14	)
Diluted income (loss) from discontinued operations per common share:
Weighted average shares outstanding	24,698			24,438			25,129
Per share amount (dollars)	$	(0.08	)	$	(0.02	)	$	(0.14	)
Weighted average shares-denominator   basic computation	24,698			24,438			24,294
Unvested restricted stock unit grant	—			—			367
Effect of dilutive stock options	—			—			468
Weighted average shares, as adjusted   denominator diluted computation	24,698			24,438			25,129

Net Income per Common Share

	Year ended December 31,
	2019			2018			2017
	(thousands of dollars)
Net income (loss)	$	(14,974	)	$	(2,332	)	$	18,009
Basic earnings (loss) per common share:
Weighted average shares outstanding	24,698			24,438			24,294
Per share amount (dollars)	$	(0.61	)	$	(0.10	)	$	0.74
Diluted earnings (loss) per common share:
Weighted average shares outstanding	24,698			24,438			25,129
Per share amount (dollars)	$	(0.61	)	$	(0.10	)	$	0.72
Weighted average shares-denominator   basic computation	24,698			24,438			24,294
Unvested restricted stock unit grant	—			—			367
Effect of dilutive stock options	—			—			468
Weighted average shares, as adjusted   denominator diluted computation	24,698			24,438			25,129