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Supplementary Information - Quarterly Results of Operations (unaudited)
 12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Supplementary Information - Quarterly Results of Operations Unaudited SUPPLEMENTARY INFORMATION - QUARTERLY RESULTS OF OPERATIONS (unaudited)
The following table summarizes our unaudited quarterly financial data for 2020 and 2019 (in thousands, except per share amounts):
 Quarter Ended
March 31 June 30 September  30 December  31 Total
2020
Net sales$93,722 $114,188 $155,391 $189,259 $552,560 
Gross profit35,597 47,396 67,938 77,871 228,802 
Operating (loss) income(1)
(560)(7,106)43,995 41,480 77,809 
Income (loss) from continuing operations2,302 (4,986)33,969 29,252 60,537 
Loss from discontinued operations(118)(124)(131)(316)(689)
Net income (loss)2,184 (5,110)33,838 28,936 59,848 
Net income (loss) per share:
Basic$0.07 $(0.17)$1.13 $0.96 $1.99 
Diluted(4)
0.07 (0.17)1.04 0.89 1.86 
2019    
Net sales$84,400 $59,004 $61,708 $104,173  $309,285 
Gross profit35,842 17,517 19,067 38,157  110,583 
Operating (loss) income(2)
(10,167)(85,414)(8,253)3,290  (100,544)
(Loss) income from continuing operations(3)
(8,484)(78,744)(8,730)3,663  (92,295)
Loss from discontinued operations(91)(124)(114)(176) (505)
Net (loss) income(8,575)(78,868)(8,844)3,487  (92,800)
Net (loss) income per share:
Basic$(0.29)$(2.66)$(0.30)$0.12  $(3.13)
Diluted(0.29)(2.66)(0.30)0.12  (3.13)

(1) Operating (loss) income for the quarter ended June 30, 2020 included a $29.0 million non-cash loss on disposal group and for the quarter ended September 30, 2020 included an $8.3 million non-cash gain on disposal group.
(2) Operating (loss) income for the quarter ended June 30, 2019 included a $72.0 million non-cash goodwill and other intangible impairment charge.
(3) (Loss) income from continuing operations for the quarter ended September 30, 2019 includes an immaterial correction to reduce income tax expense and the valuation allowance by $1.8 million. The correction reflects the impact of 2017 tax reform associated with the application of indefinite-lived deferred taxes to properly calculate the valuation allowance.
(4) May not foot or cross foot due to rounding.