Reconciliation of (Loss) Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator for basic (loss) earnings per share:
Net (loss) earnings	$ (22,829)		$ 3,873		$ (87,560)	$ (8,739)
Numerator for diluted loss per share:
Net (loss) earnings	(22,829)	$ (64,731)	3,873	$ (12,612)	(87,560)	(8,739)
Net (loss) earnings plus interest expense attributable to convertible notes	$ (22,829)		$ 3,873		$ (87,560)	$ (8,739)
Denominator for basic (loss) earnings per share:
Basic weighted average common shares outstanding during the period	21,230		21,181		21,229	21,170
Denominator for diluted (loss) earnings per share:
Basic weighted average common shares outstanding during the period	21,230		21,181		21,229	21,170
Net effect of dilutive stock options, DSUs, RSAs and RSUs			8
Diluted weighted average common shares	21,230		21,189		21,229	21,170
Basic (in dollars per share)	$ (1.08)		$ 0.18		$ (4.12)	$ (0.41)
Diluted (in dollars per share)	$ (1.08)		$ 0.18		$ (4.12)	$ (0.41)
RSAs, RSUs, and DSUs
Denominator for diluted (loss) earnings per share:
Antidilutive securities excluded from weighted average share calculations (in shares)					1,000
Convertible Debt Notes
Denominator for diluted (loss) earnings per share:
Antidilutive securities excluded from weighted average share calculations (in shares)	1,200		1,200		1,200	1,200
Warrant
Denominator for diluted (loss) earnings per share:
Antidilutive securities excluded from weighted average share calculations (in shares)	213