Unaudited Quarterly Financial Results (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Schedule of Selected Consolidated Statements of Operations

The following tables present selected unaudited Consolidated Statements of Operations for each quarter of the years ended December 31, 2017 and 2016.

	Fiscal Year 2017
	First Quarter		Second Quarter			Third Quarter		Fourth Quarter
	(In thousands of US dollars, except share data)
Net sales	$	161,710	$	166,685		$	176,697	$	174,580
Gross profit		41,570		46,662			50,310		49,351
Operating income		6,367		9,742			15,490		7,637
Net income (loss)	$	43,738	$	(8,059	)	$	5,604	$	43,653
Earnings (loss) per share:
Basic	$	1.30	$	(0.24	)	$	0.16	$	1.28
Diluted	$	1.05	$	(0.24	)	$	0.15	$	0.99
Weighted average common stock outstanding:
Basic		33,662,297		33,952,574			34,103,029		34,176,812
Diluted		42,892,044		33,952,574			45,542,418		45,573,889
	Fiscal Year 2016
	First Quarter		Second Quarter			Third Quarter		Fourth Quarter
	(In thousands of US dollars, except share data)
Net sales	$	148,105	$	167,106		$	192,296	$	180,462
Gross profit		34,249		36,749			39,139		46,089
Operating income (loss)		4,267		(7,377	)		618		5,229
Net income (loss)	$	8,125	$	(17,816	)	$	29,866	$	(49,790	)
Earnings (loss) per share:
Basic	$	0.23	$	(0.51	)	$	0.86	$	(1.42	)
Diluted	$	0.23	$	(0.51	)	$	0.85	$	(1.42	)
Weighted average common stock outstanding:
Basic		34,698,904		34,716,081			34,849,805		35,068,330
Diluted		34,918,568		34,716,081			35,302,706		35,068,330