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Error Correction (Restated Consolidated Statements) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Consolidated Statements of Income
Net Sales	$ 137,483	$ 113,822
Cost of sales	94,536	88,392
Gross profit	42,947	25,430
Selling, general and administrative expenses	15,214	13,677
(Gain) loss on disposition of assets	(62)	284
Income from operations	27,795	11,469
Interest income, net		9
Other (expense) income, net	(27)	(26)
Income before taxes	27,829	11,452
Income tax provision	5,976	2,695
Net income	$ 21,853	$ 8,757
Earnings per share:
Basic (usd per share)	$ 0.42	$ 0.17
Diluted (usd per share)	$ 0.41	$ 0.17
Weighted average shares outstanding:
Basic (in shares)	52,071,839	51,992,150
Diluted (in shares)	52,871,419	52,369,660
Balance Sheet Data (at end of period):
Current assets	$ 196,966	$ 146,511	$ 187,549
Total assets	395,620	319,238	371,424
Current liabilities	64,185	43,082	56,028
Deferred income taxes	15,130	10,168	15,297
Other long-term liabilities	3,652	3,442	3,639
Total stockholders' equity	306,323	262,546	290,140	$ 249,443
Share-based compensation	2,351	5,407
Profit sharing bonus plan expense	3,167	1,306
Consolidated Statements of Stockholders’ Equity
Total stockholders' equity	306,323	262,546	290,140	249,443
Net income	21,853	8,757
Stock options exercised and restricted stock awards granted	4,497	4,010
Share-based compensation	2,351	5,407
Stock repurchased and retired	(12,518)	(5,071)
Operating Activities
Net income	21,853	8,757
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,002	5,914
Provision for losses on accounts receivable, net of adjustments	294	115
Provision for excess and obsolete inventories	(274)	357
Share-based compensation	2,351	5,407
Loss (gain) on disposition of assets	(62)	284
Foreign currency transaction (gain) loss	51	(16)
Interest income on note receivable	(6)	(6)
Deferred income taxes	(167)	909
Changes in assets and liabilities:
Accounts receivable	(2,789)	(4,725)
Income taxes	772	1,432
Inventories	1,020	2,678
Prepaid expenses and other	(670)	(561)
Accounts payable	2,742	(5,730)
Deferred revenue	229	25
Accrued liabilities and donations	6,241	73
Net cash provided by operating activities	37,597	14,913
Investing Activities
Capital expenditures	(21,877)	(8,772)
Proceeds from sale of property, plant and equipment	61	52
Principal payments from note receivable	12	17
Net cash used in investing activities	(21,804)	(8,703)
Financing Activities
Stock options exercised	4,497	4,010
Repurchase of stock	(11,565)	(4,483)
Employee taxes paid by withholding shares	(953)	(588)
Net cash used in financing activities	(8,021)	(1,061)
Net increase in cash, cash equivalents and restricted cash	7,772	5,149
Cash, cash equivalents and restricted cash, beginning of period	44,373	1,994
Cash, cash equivalents and restricted cash, end of period	52,145	7,143
Common Stock
Balance Sheet Data (at end of period):
Total stockholders' equity	$ 208	$ 208	$ 208	$ 208
Consolidated Statements of Stockholders’ Equity
Shares, Outstanding	52,044,000	52,099,000	52,079,000	51,991,000
Total stockholders' equity	$ 208	$ 208	$ 208	$ 208
Stock options exercised and restricted stock awards granted (in shares)	212,000	237,000
Stock options exercised and restricted stock awards granted	$ 1	$ 1
Stock repurchased and retired (in shares)	(247,000)	(129,000)
Stock repurchased and retired	$ (1)	$ (1)
Paid-in Capital
Balance Sheet Data (at end of period):
Total stockholders' equity	0	4,346	3,631	0
Consolidated Statements of Stockholders’ Equity
Total stockholders' equity	0	4,346	3,631	0
Stock options exercised and restricted stock awards granted	4,496	4,009
Share-based compensation	2,351	5,407
Stock repurchased and retired	(10,478)	(5,070)
Retained Earnings
Consolidated Statements of Income
Net income	21,853	8,757
Balance Sheet Data (at end of period):
Total stockholders' equity	306,115	257,992	286,301	249,235
Consolidated Statements of Stockholders’ Equity
Total stockholders' equity	306,115	257,992	$ 286,301	249,235
Net income	21,853	8,757
Stock repurchased and retired	(2,039)
Operating Activities
Net income	$ 21,853	8,757
Previously Reported
Consolidated Statements of Income
Net Sales		113,822
Cost of sales		88,029
Gross profit		25,793
Selling, general and administrative expenses		11,001
(Gain) loss on disposition of assets		284
Income from operations		14,508
Interest income, net		9
Other (expense) income, net		(26)
Income before taxes		14,491
Income tax provision		3,589
Net income		$ 10,902
Earnings per share:
Basic (usd per share)		$ 0.21
Diluted (usd per share)		$ 0.21
Weighted average shares outstanding:
Basic (in shares)		51,992,150
Diluted (in shares)		52,369,660
Balance Sheet Data (at end of period):
Current assets		$ 146,798
Total assets		319,525
Current liabilities		44,000
Deferred income taxes		12,713
Other long-term liabilities		3,442
Total stockholders' equity		259,370		247,499
Consolidated Statements of Stockholders’ Equity
Total stockholders' equity		259,370		247,499
Net income		10,902
Stock options exercised and restricted stock awards granted		4,010
Share-based compensation		2,030
Stock repurchased and retired		(5,071)
Operating Activities
Net income		10,902
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		5,914
Provision for losses on accounts receivable, net of adjustments		115
Provision for excess and obsolete inventories		357
Share-based compensation		2,030
Loss (gain) on disposition of assets		284
Foreign currency transaction (gain) loss		(16)
Interest income on note receivable		(6)
Deferred income taxes		1,887
Changes in assets and liabilities:
Accounts receivable		(4,725)
Income taxes		(1,348)
Inventories		2,678
Prepaid expenses and other		(561)
Accounts payable		(5,730)
Deferred revenue		25
Accrued liabilities and donations		411
Net cash provided by operating activities		14,913
Investing Activities
Capital expenditures		(8,772)
Proceeds from sale of property, plant and equipment		52
Principal payments from note receivable		17
Net cash used in investing activities		(8,703)
Financing Activities
Stock options exercised		4,010
Repurchase of stock		(4,483)
Employee taxes paid by withholding shares		(588)
Net cash used in financing activities		(1,061)
Net increase in cash, cash equivalents and restricted cash		5,149
Cash, cash equivalents and restricted cash, beginning of period		1,994
Cash, cash equivalents and restricted cash, end of period		7,143
Previously Reported | Common Stock
Balance Sheet Data (at end of period):
Total stockholders' equity		$ 208		$ 208
Consolidated Statements of Stockholders’ Equity
Shares, Outstanding		52,099,000		51,991,000
Total stockholders' equity		$ 208		$ 208
Stock options exercised and restricted stock awards granted (in shares)		237,000
Stock options exercised and restricted stock awards granted		$ 1
Stock repurchased and retired (in shares)		(129,000)
Stock repurchased and retired		$ (1)
Previously Reported | Paid-in Capital
Balance Sheet Data (at end of period):
Total stockholders' equity		969		0
Consolidated Statements of Stockholders’ Equity
Total stockholders' equity		969		0
Stock options exercised and restricted stock awards granted		4,009
Share-based compensation		2,030
Stock repurchased and retired		(5,070)
Previously Reported | Retained Earnings
Consolidated Statements of Income
Net income		10,902
Balance Sheet Data (at end of period):
Total stockholders' equity		258,193		247,291
Consolidated Statements of Stockholders’ Equity
Total stockholders' equity		258,193		247,291
Net income		10,902
Stock repurchased and retired		0
Operating Activities
Net income		10,902
Corrections
Consolidated Statements of Income
Net Sales		0
Cost of sales		363
Gross profit		(363)
Selling, general and administrative expenses		2,676
(Gain) loss on disposition of assets		0
Income from operations		(3,039)
Interest income, net		0
Other (expense) income, net		0
Income before taxes		(3,039)
Income tax provision		(894)
Net income		$ (2,145)
Earnings per share:
Basic (usd per share)		$ (0.04)
Diluted (usd per share)		$ (0.04)
Weighted average shares outstanding:
Basic (in shares)		0
Diluted (in shares)		0
Balance Sheet Data (at end of period):
Current assets		$ (287)
Total assets		(287)
Current liabilities		(918)
Deferred income taxes		(2,545)
Other long-term liabilities		0
Total stockholders' equity		3,176		1,944
Consolidated Statements of Stockholders’ Equity
Total stockholders' equity		3,176		1,944
Net income		(2,145)
Stock options exercised and restricted stock awards granted		0
Share-based compensation		3,377
Stock repurchased and retired		0
Operating Activities
Net income		(2,145)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		0
Provision for losses on accounts receivable, net of adjustments		0
Provision for excess and obsolete inventories		0
Share-based compensation		3,377
Loss (gain) on disposition of assets		0
Foreign currency transaction (gain) loss		0
Interest income on note receivable		0
Deferred income taxes		(978)
Changes in assets and liabilities:
Accounts receivable		0
Income taxes		(84)
Inventories		0
Prepaid expenses and other		0
Accounts payable		0
Deferred revenue		0
Accrued liabilities and donations		(338)
Net cash provided by operating activities		0
Investing Activities
Capital expenditures		0
Proceeds from sale of property, plant and equipment		0
Principal payments from note receivable		0
Net cash used in investing activities		0
Financing Activities
Stock options exercised		0
Repurchase of stock		0
Employee taxes paid by withholding shares		0
Net cash used in financing activities		0
Net increase in cash, cash equivalents and restricted cash		0
Cash, cash equivalents and restricted cash, beginning of period		0
Cash, cash equivalents and restricted cash, end of period		0
Corrections | Common Stock
Balance Sheet Data (at end of period):
Total stockholders' equity		$ 0		$ 0
Consolidated Statements of Stockholders’ Equity
Shares, Outstanding		0		0
Total stockholders' equity		$ 0		$ 0
Stock options exercised and restricted stock awards granted (in shares)		0
Stock options exercised and restricted stock awards granted		$ 0
Stock repurchased and retired (in shares)		0
Stock repurchased and retired		$ 0
Corrections | Paid-in Capital
Balance Sheet Data (at end of period):
Total stockholders' equity		3,377		0
Consolidated Statements of Stockholders’ Equity
Total stockholders' equity		3,377		0
Stock options exercised and restricted stock awards granted		0
Share-based compensation		3,377
Stock repurchased and retired		0
Corrections | Retained Earnings
Consolidated Statements of Income
Net income		(2,145)
Balance Sheet Data (at end of period):
Total stockholders' equity		(201)		1,944
Consolidated Statements of Stockholders’ Equity
Total stockholders' equity		(201)		$ 1,944
Net income		(2,145)
Stock repurchased and retired		0
Operating Activities
Net income		(2,145)
Corrections | Cost of Sales
Balance Sheet Data (at end of period):
Share-based compensation		400
Corrections | Selling, General and Administrative Expenses
Balance Sheet Data (at end of period):
Share-based compensation		3,000
Profit sharing bonus plan expense		$ 400

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