Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

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)
2017	$	425	$	285		$	(323	)	$	387
2016	$	477	$	2		$	(54	)	$	425
2015	$	811	$	(152	)	$	(182	)	$	477

Schedule of Changes to Obsolete Inventories Reserve

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

	Balance at beginning of year		Net additions charged to earnings		Disposals			Balance at end of year
	(In thousands)
2017	$	3,639	$	1,295	$	(1,053	)	$	3,881
2016	$	3,836	$	1,017	$	(1,214	)	$	3,639
2015	$	3,314	$	2,530	$	(2,008	)	$	3,836

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, 2017				December 31, 2016
	Gross carrying amount		Accumulated amortization		Gross carrying amount		Accumulated amortization
	(In thousands)
Technologies	$	47,647	$	21,882	$	47,657	$	18,970
Intellectual property	10,000		333		—		—
Non-compete agreements	2,322		1,923		2,112		1,670
Licenses	650		475		650		458
Customer lists	8,023		2,011		4,923		1,698
Customer relationships	21,620		9,649		20,790		7,416
Trade names	9,595		4,258		9,475		3,523
Total intangibles	$	99,857	$	40,531	$	85,607	$	33,735

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		Net additions charged to earnings		Adjustments to pre-existing warranties			Costs incurred			Balance at end of year
	(In thousands)
2017	$	2,779	$	4,520	$	(439	)	$	(3,493	)	$	3,367
2016	$	3,133	$	3,559	$	(554	)	$	(3,359	)	$	2,779
2015	$	1,739	$	1,559	$	1,278		$	(1,443	)	$	3,133

Schedule of Accumulated Other Comprehensive Loss

Components of accumulated other comprehensive loss at December 31, 2017 are as follows:

	Pension and postretirement benefits			Foreign currency			Total
				(In thousands)
Balance at beginning of period	$	(10,495	)	$	(1,140	)	$	(11,635	)
Other comprehensive income before reclassifications	—			1,844			1,844
Amounts reclassified from accumulated other comprehensive loss, net of tax of $0.3 million	(1,102		)	—			(1,102		)
Net current period other comprehensive (loss) income, net	(1,102		)	1,844			742
Accumulated other comprehensive (loss) income	$	(11,597	)	$	704		$	(10,893	)

Details of reclassifications out of accumulated other comprehensive loss during 2017 are as follows:

	Amount reclassified from accumulated other comprehensive loss
	(In thousands)
Amortization of employee benefit plan items:
Prior service cost (1)	$	(25	)
Settlement expense (1)	641
Actuarial loss (1)	(2,010		)
Total before tax	(1,394		)
Income tax impact	292
Amount reclassified out of accumulated other comprehensive loss	$	(1,102	)

(1) These accumulated other comprehensive loss components are included in the computation of benefit plan costs in Note 7 “Employee Benefit Plans.”

Components of accumulated other comprehensive loss at December 31, 2016 are as follows:

	Pension and postretirement benefits			Foreign currency			Total
	(In thousands)
Balance at beginning of period	$	(11,968	)	$	(812	)	$	(12,780	)
Other comprehensive income before reclassifications	—			(328		)	(328		)
Amounts reclassified from accumulated other comprehensive loss, net of tax of $(1.0) million	1,473			—			1,473
Net current period other comprehensive income (loss), net	1,473			(328		)	1,145
Accumulated other comprehensive loss	$	(10,495	)	$	(1,140	)	$	(11,635	)

Details of reclassifications out of accumulated other comprehensive loss during 2016 are as follows:

	Amount reclassified from accumulated other comprehensive loss
	(In thousands)
Amortization of employee benefit plan items:
Prior service cost (1)	$	(25	)
Settlement expense (1)	1,510
Actuarial loss (1)	1,007
Total before tax	2,492
Income tax impact	(1,019		)
Amount reclassified out of accumulated other comprehensive loss	$	1,473

(1) These accumulated other comprehensive loss components are included in the computation of benefit plan costs in Note 7 “Employee Benefit Plans.”