Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Schedule of Changes in Allowance for Doubtful Accounts

Changes in the Company's allowance for doubtful accounts are as follows:

	Balance at beginning of year		Provision and reserve adjustments			Write-offs less recoveries			Balance at end of year
	(In thousands)
2020	$	224	$	356		$	(28	)	$	552
2019	$	360	$	(132	)	$	(4	)	$	224
2018	$	387	$	—		$	(27	)	$	360

Schedule of Changes to Obsolete and Excess Inventories Reserve

Changes to the Company's obsolete and excess inventories reserve are as follows:

	Balance at beginning of year		Net additions charged to earnings		Disposals			Balance at end of year
	(In thousands)
2020	$	5,440	$	2,964	$	(2,004	)	$	6,400
2019	$	4,131	$	2,663	$	(1,354	)	$	5,440
2018	$	3,881	$	2,195	$	(1,945	)	$	4,131

Schedule of Carrying Value and Accumulated Amortization of Intangible Assets

The carrying value and accumulated amortization by major class of intangible assets are as follows:

	December 31, 2020				December 31, 2019
	Gross carrying amount		Accumulated amortization		Gross carrying amount		Accumulated amortization
	(In thousands)
Technologies	$	52,536	$	30,598	$	47,608	$	27,650
Intellectual property		10,000		1,833		10,000		1,333
Non-compete agreements		931		413		572		431
Licenses		650		526		650		509
Customer lists		8,023		3,846		8,023		3,234
Customer relationships		28,630		16,146		25,220		14,730
Trade names		12,136		5,946		9,203		5,226
Total intangibles	$	112,906	$	59,308	$	101,276	$	53,113

Schedule of Changes in Warranty and After-Sale Costs Reserve

Changes in the Company's warranty and after-sale costs reserve are as follows:

	Balance at beginning of year		Provision of acquired business		Net additions charged to earnings		Costs incurred			Balance at end of year
	(In thousands)
2020	$	5,583	$	500	$	7,855	$	(2,321	)	$	11,617
2019	$	4,206	$	—	$	6,616	$	(5,239	)	$	5,583
2018	$	3,367	$	—	$	3,274	$	(2,435	)	$	4,206

Schedule of Accumulated Other Comprehensive Income (Loss)

Components of accumulated other comprehensive income at December 31, 2020 are as follows:

	Pension and postretirement benefits			Foreign currency		Total
	(In thousands)
Balance at beginning of period	$	263		$	162	$	425
Other comprehensive income before reclassifications		—			1,096		1,096
Amounts reclassified from accumulated other comprehensive income    (loss), net of tax of $69		(208	)		—		(208	)
Net current period other comprehensive (loss) income, net		(208	)		1,096		888
Accumulated other comprehensive income	$	55		$	1,258	$	1,313

Reclassifications out of accumulated other comprehensive income during 2020 are immaterial.

Components of accumulated other comprehensive income at December 31, 2019 are as follows:

	Pension and postretirement benefits			Foreign currency			Total
	(In thousands)
Balance at beginning of period	$	360		$	220		$	580
Other comprehensive income (loss) before reclassifications		—			(58	)		(58	)
Amounts reclassified from accumulated other comprehensive income,    net of tax of $16		(97	)		—			(97	)
Net current period other comprehensive income (loss), net		(97	)		(58	)		(155	)
Accumulated other comprehensive income	$	263		$	162		$	425

Reclassifications out of accumulated other comprehensive income during 2019 are as follows:

	Amount reclassified from accumulated other comprehensive income
	(In thousands)
Amortization of employee benefit plan items:
Actuarial gains and losses (1)	$	(639	)
Plan settlement (2)		526
Total before tax		(113	)
Income tax impact		16
Amount reclassified out of accumulated other comprehensive income	$	(97	)

(1)These accumulated other comprehensive loss components are included in the computation of benefit plan costs in Note 7 “Employee Benefit Plans.”                                                                                                                                                  (2)   This accumulated other comprehensive income component results from an international pension plan settlement.