CTS (CTS) 10-K 23 Feb 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Feb. 20, 2018	Jun. 30, 2017
Document and Entity Information
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Trading Symbol	CTS
Entity Registrant Name	CTS CORP
Entity Central Index Key	26,058
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		32,938,466
Entity Public Float			$ 706,120,000

Consolidated Statements of Earn

Consolidated Statements of Earnings (Loss) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net Sales
Net sales	$ 422,993	$ 396,679	$ 382,310
Cost of goods sold	282,562	256,251	255,201
Gross Margin	140,431	140,428	127,109
Selling, general and administrative expenses	71,943	61,624	59,586
Research and development expenses	25,146	24,040	22,461
Non-recurring environmental expense	0	0	14,541
Restructuring and impairment char	4,139	3,048	14,564
Gain (Loss) on Disposition of Property Plant Equipment	708	(11,450)	(2,156)
Operating earnings	38,495	63,166	18,113
Other (expense) income:
Interest expense	(3,343)	(3,702)	(2,628)
Interest income	1,284	1,305	3,073
Other income (expense)	3,817	(3,524)	(6,297)
Total other income (expense), net	1,758	(5,921)	(5,852)
Earnings before taxes	40,253	57,245	12,261
Income tax expense	25,805	22,865	5,307
Net earnings	$ 14,448	$ 34,380	$ 6,954
Basic
Net earnings (loss) per share (usd per share)	$ 0.44	$ 1.05	$ 0.21
Diluted
Diluted net earnings (loss) per share (usd per share)	$ 0.43	$ 1.03	$ 0.21
Basic weighted-average common shares outstanding (in shares)	32,892	32,728	32,959
Effect of dilutive securities (in shares)	528	523	525
Diluted weighted - average common shares outstanding (in shares)	33,420	33,251	33,484
Cash dividends declared per share (in dollars per share)	$ 0.16	$ 0.16	$ 0.160

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Consolidated Statements of Comprehensive Earnings
Net earnings	$ 14,448	$ 34,380	$ 6,954
Other comprehensive earnings (loss):
Changes in fair market value of hedges, net of tax	110	553	157
Changes in unrealized pension cost, net of tax	13,687	6,412	6,809
Cumulative translation adjustment, net of tax	437	(1,154)	(1,738)
Other comprehensive earnings	14,234	5,811	5,228
Comprehensive earnings	$ 28,682	$ 40,191	$ 12,182

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 113,572	$ 113,805
Accounts receivable, net	70,584	62,612
Inventories, net	36,596	28,652
Other current assets	12,857	10,638
Total current assets	233,609	215,707
Property, plant and equipment, net	88,247	82,111
Other Assets
Prepaid pension asset	57,050	46,183
Goodwill	71,057	61,744
Other intangible assets, net	66,943	64,370
Deferred income taxes	20,694	45,839
Other assets	2,096	1,743
Total other assets	217,840	219,879
Total Assets	539,696	517,697
Current Liabilities
Short-term Non-bank Loans and Notes Payable	0	1,006
Accounts payable	49,201	40,046
Accrued payroll and benefits	11,867	11,369
Accrued expenses and other liabilities	41,344	45,708
Total current liabilities	102,412	98,129
Long-term debt	76,300	89,100
Long-term pension obligations	7,201	7,006
Deferred Tax Liabilities, Net, Noncurrent	3,802	2,367
Other long-term obligations	6,176	3,213
Total Liabilities	195,891	199,815
Shareholders' Equity
Common stock	304,777	302,832
Additional contributed capital	41,084	40,521
Retained earnings	420,160	410,979
Accumulated other comprehensive loss	(78,960)	(93,194)
Total shareholders' equity before treasury stock	687,061	661,138
Treasury stock	(343,256)	(343,256)
Total shareholders' equity	343,805	317,882
Total Liabilities and Shareholders' Equity	$ 539,696	$ 517,697

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net earnings	$ 14,448	$ 34,380	$ 6,954
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	20,674	18,992	16,254
Stock-based compensation	4,184	2,738	3,195
Restructuring loss on pension settlement	0	0	8,280
Pension and other post-retirement plan expense (income)	11,570	(1,599)	(2,451)
Non-recurring environmental expense	0	0	14,541
Deferred income taxes	16,710	10,297	(8,920)
Gain (Loss) on Disposition of Property Plant Equipment	(708)	11,450	2,156
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	94	(36)	0
Changes in assets and liabilities, net of acquisitions and divestitures:
Accounts receivable	(5,198)	(7,120)	1,036
Inventories	(5,404)	(2,290)	2,225
Other assets	(1,531)	(289)	4,090
Accounts payable	5,387	537	(5,126)
Accrued Salaries and Benefits	(1,666)	1,876	(3,012)
Accrued expenses	28	451	1,184
Income taxes payable	(4,555)	966	5,264
Other liabilities	(2,918)	(52)	2,502
Pension and other post-retirement plans	(319)	(303)	295
Total adjustments	43,600	12,822	32,197
Net cash provided by operating activities	58,048	47,202	39,151
Cash flows from investing activities:
Capital expenditures	(18,094)	(20,500)	(9,723)
Proceeds from sale of assets	541	12,296	1,878
Payment for acquisitions, net of cash acquired	(19,121)	(73,063)	(1,285)
Net cash used in investing activities	(36,674)	(81,267)	(9,130)
Cash flows from financing activities:
Payments of long-term debt	(1,518,200)	(2,458,400)	(1,343,500)
Proceeds from borrowings of long-term debt	1,505,400	2,456,800	1,359,200
Payments of short-term notes payable	(1,150)	0	(164)
Proceeds from borrowings of short-term notes payable	0	0	164
Purchase of treasury stock	0	0	(18,088)
Dividends paid	(5,260)	(5,234)	(5,291)
Exercise of stock options	0	0	64
Excess tax benefit on stock-based compensation	0	0	313
Payments Related to Tax Withholding for Share-based Compensation	(1,604)	(1,809)	(527)
Net cash used in financing activities	(20,814)	(8,643)	(7,829)
Effect of exchange rate on cash and cash equivalents	(793)	(415)	228
Net (decrease) increase in cash and cash equivalents	(233)	(43,123)	22,420
Cash and cash equivalents at beginning of year	113,805	156,928	134,508
Cash and cash equivalents at end of year	113,572	113,805	156,928
Supplemental cash flow information:
Cash paid for interest	2,130	2,939	2,415
Cash paid for income taxes, net	10,884	10,471	6,779
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Notes Issued	0	1,006	0
Capital Expenditures Incurred but Not yet Paid	$ 5,914	$ 3,214	$ 2,813

Consolidated Statements of Shar

Consolidated Statements of Shareholders Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Contributed Capital	Retained Earnings	Accumulated Other Comprehensive Earnings/(Loss)	Treasury Stock
Beginning Balance at Dec. 31, 2014	$ 289,789	$ 299,892	$ 39,153	$ 380,145	$ (104,233)	$ (325,168)
Increase (Decrease) in Stockholders' Equity
Net (loss) earnings	6,954			6,954
Changes in fair market value of hedges, net of tax	157				157
Changes in unrealized pension cost, net of tax	6,809				6,809
Cumulative translation adjustment, net of tax	(1,738)				(1,738)
Cash dividends	(5,259)			(5,259)
Acquired shares for treasury stock	(18,088)					(18,088)
Stock Issued During Period, Value, Stock Options Exercised	64	64	0
Issued shares on vesting of restricted stock units	(542)	953	(1,495)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	313		313
Stock compensation	3,195		3,195
Ending balance at Dec. 31, 2015	281,654	300,909	41,166	381,840	(99,005)	(343,256)
Increase (Decrease) in Stockholders' Equity
Net (loss) earnings	34,380			34,380
Changes in fair market value of hedges, net of tax	553				553
Changes in unrealized pension cost, net of tax	6,412				6,412
Cumulative translation adjustment, net of tax	(1,154)				(1,154)
Cash dividends	(5,241)			(5,241)
Issued shares on vesting of restricted stock units	(1,384)	1,923	(3,307)
Stock compensation	2,662		2,662
Ending balance at Dec. 31, 2016	317,882	302,832	40,521	410,979	(93,194)	(343,256)
Increase (Decrease) in Stockholders' Equity
Net (loss) earnings	14,448			14,448
Changes in fair market value of hedges, net of tax	110				110
Changes in unrealized pension cost, net of tax	13,687				13,687
Cumulative translation adjustment, net of tax	437				437
Cash dividends	(5,267)			(5,267)
Issued shares on vesting of restricted stock units	(1,604)	1,945	(3,549)
Stock compensation	4,112		4,112
Ending balance at Dec. 31, 2017	$ 343,805	$ 304,777	$ 41,084	$ 420,160	$ (78,960)	$ (343,256)

Consolidated Statements of Sha7

Consolidated Statements of Shareholders Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Increase (Decrease) in Stockholders' Equity
Cash dividends declared per share (in dollars per share)	$ 0.16	$ 0.16	$ 0.160
Treasury stock acquired (shares)	0	0	984,342

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Description of Business: CTS Corporation ("CTS", "we", "our", "us" or the "Company") is a global manufacturer of sensors, electronic components, and actuators. We operate manufacturing facilities located throughout North America, Asia and Europe and service major markets globally. CTS consists of one reportable business segment. Principles of Consolidation: The consolidated financial statements include the accounts of CTS and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated. Fiscal Calendar: We began using a calendar period end in 2016. Prior to that, we operated on a 4 week/ 4 week/ 5 week fiscal quarter, and each fiscal quarter ended on a Sunday. The fiscal year always began on January 1 and ended on December 31. Our fiscal calendar resulted in some fiscal quarters being either longer or shorter than 13 weeks, depending on the days of the week on which those dates fell. Use of Estimates: The preparation of financial statements in conformity with the accounting principles generally accepted in the United States of America ("U.S. GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ materially from those estimates. Cash and Cash Equivalents: All highly liquid investments with maturities of three months or less at the date of purchase are considered to be cash equivalents. Accounts Receivable and Allowance for Doubtful Accounts: Accounts receivable consists primarily of amounts due from normal business activities. We maintain an allowance for doubtful accounts for estimated uncollectible accounts receivable. Our reserves for estimated credit losses are based upon historical experience and specific customer collection issues. Accounts are written off against the allowance account when they are determined to no longer be collectible. Concentration of Credit Risk: Financial instruments that potentially subject us to concentrations of credit risk consist of cash and cash equivalents. Our cash and cash equivalents, at times, may exceed federally insured limits. Cash and cash equivalents are deposited primarily in banking institutions with global operations. We have not experienced any losses in such accounts. We believe we are not exposed to any significant credit risk on cash and cash equivalents. Trade receivables subject us to the potential for credit risk with major customers. We sell our products to customers principally in the transportation, industrial, medical, defense and aerospace, information technology, and communications markets, primarily in North America, Europe, and Asia. We perform ongoing credit evaluations of our customers to minimize credit risk. We do not require collateral. The allowance for doubtful accounts is based on management's estimates of the collectability of its accounts receivable after analyzing historical bad debts, customer concentrations, customer creditworthiness, and current economic trends. Uncollectible trade receivables are charged against the allowance for doubtful accounts when all reasonable efforts to collect the amounts due have been exhausted. Our net sales to significant customers as a percentage of total net sales were as follows: Years Ended December 31, 2017 2016 2015 Cummins Inc. 13.4% 9.9% 9.3% Honda Motor Co. 11.2% 10.7% 10.7% Toyota Motor Corporation 10.2% 10.4% 10.1% We sell automotive parts to these three customers for certain vehicle platforms under purchase agreements that have no volume commitments and are subject to purchase orders issued from time to time. No other customer accounted for 10% or more of total net sales during these periods. Inventories: We value our inventories at the lower of the actual cost to purchase or manufacture or the net realizable value using the first-in, first-out ("FIFO") method. We review inventory quantities on hand and record a provision for excess and obsolete inventory based on forecasts of product demand and production requirements. Retirement Plans: We have various defined benefit and defined contribution retirement plans. Our policy is to annually fund the defined benefit pension plans at or above the minimum required by law. We: 1) recognize the funded status of a benefit plan (measured as the difference between plan assets at fair value and the benefit obligation) in our Consolidated Balance Sheets; 2) recognize the gains or losses and prior service costs or credits that arise during the period but are not recognized as components of net periodic benefit/cost as a component of other comprehensive earnings; and 3) measure defined benefit plan assets and obligations as of the date of our fiscal year-end. See NOTE 5, "Retirement Plans" for further information. Property, Plant and Equipment: Property, plant and equipment is stated at cost. Depreciation and amortization is computed primarily over the estimated useful lives of the various classes of assets using the straight-line method. Useful lives for buildings and improvements range from 10 to 45 years . Machinery and equipment useful lives range from 3 to 15 years . Depreciation on leasehold improvements is computed over the lesser of the lease term or estimated useful lives of the assets. Amounts expended for maintenance and repairs are charged to expense as incurred. Upon disposition, any related gains or losses are included in operating earnings. Income Taxes: We account for income taxes under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements. Under this method, we determine deferred tax assets and liabilities on the basis of the differences between the financial statement and tax bases of assets and liabilities by using enacted tax rates in effect for the year in which the differences are expected to reverse. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date. We recognize deferred tax assets to the extent that we believe that these assets are more-likely-than-not to be realized. In making such a determination, we consider all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies, and results of recent operations. If we determine that we would be able to realize our deferred tax assets in the future in excess of their net recorded amount, we would make an adjustment to the deferred tax asset valuation allowance, which would reduce the provision for income taxes. In 2016, we elected to early adopt ASU 2015-17 "Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes", on a retrospective basis allowing for all deferred tax items to be classified as non-current. Certain non-current deferred tax assets and non-current deferred tax liabilities were not netted since these items relate to different tax jurisdictions. We record uncertain tax positions in accordance with ASC 740 on the basis of a two-step process in which (1) we determine whether it is more-likely-than-not that the tax positions will be sustained on the basis of the technical merits of the position and (2) for those tax positions that meet the more-likely-than-not recognition threshold, we recognize the largest amount of tax benefit that is more than 50 percent likely to be realized upon ultimate settlement with the related tax authority. We recognize interest and penalties related to unrecognized tax benefits on the income tax expense line in the accompanying Consolidated Statements of Operations. Accrued interest and penalties are included on the related tax liability line in the Consolidated Balance Sheets. See NOTE 17, "Income Taxes" for further information. Goodwill and Indefinite-lived Intangible Assets: Goodwill represents the excess of the purchase price over the fair values of the net assets acquired in a business combination. We test the impairment of goodwill at least annually, or more frequently if events or changes in circumstances indicate that the carrying value may not be recoverable. The impairment evaluation utilizes a two-step test. The first step compares the fair value of each reporting unit to its carrying value, including goodwill. If the fair value of the reporting unit is equal to or greater than its carrying value, goodwill is not impaired and no further testing is required. If the carrying value exceeds fair value, then the second step of the impairment test is performed in order to determine if the implied fair value of the goodwill of the reporting unit exceeds the carrying value of that goodwill. Goodwill is impaired when the carrying value of the goodwill exceeds its implied fair value. Impaired goodwill is written down to its implied fair value through a non-cash expense recorded in results of operations in the period the impairment is identified. In 2015, we changed the date of our annual impairment test from the last day of our fiscal year to the first day of our fourth quarter. This change did not have a material effect on the results of our impairment test. We completed our annual impairment test during 2017 and determined that our goodwill was not impaired as of the measurement date. No goodwill impairment was recorded for the years ended December 31, 2017 , 2016 and 2015 . We also have acquired in-process research and development ("IPR&D") intangible assets that are treated as indefinite-lived intangible assets and therefore not subject to amortization until the completion or abandonment of the associated research and development efforts. If these efforts are abandoned in the future, the carrying value of the IPR&D asset will be expensed. If the research and development efforts are successfully completed, the IPR&D will be reclassified as a finite-lived asset and amortized over its useful life. No significant impairments were recorded in the years ended December 31, 2017 , 2016 and 2015 . Other Intangible Assets and Long-lived Assets: We account for long-lived assets (excluding indefinite-lived intangible assets) in accordance with the provisions of ASC 360. This statement requires that long-lived assets, which includes fixed assets and finite-lived intangible assets, be reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If an impairment test is warranted, recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to the sum of the undiscounted cash flows expected to result from the use and the eventual disposition of the asset. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount in which the carrying amount of the assets exceeds the fair value of the assets. Assets to be disposed of are reported at the lower of the carrying amount or fair value less costs to sell. Intangible assets (excluding indefinite-lived intangible assets) consist primarily of technology, customer lists and relationships, patents, and trade names. These assets are recorded at cost and usually amortized on a straight-line basis over their estimated lives. We assess useful lives based on the period over which the asset is expected to contribute to cash flows. Revenue Recognition: Product revenue is recognized once four criteria are met: 1) we have persuasive evidence that an arrangement exists; 2) delivery has occurred and title has passed to the customer, which generally happens at the point of shipment provided that no significant obligations remain; 3) the price is fixed and determinable; and 4) collectability is reasonably assured. Research and Development: Research and development ("R&D") costs include expenditures for planned search and investigation aimed at discovery of new knowledge to be used to develop new products or processes or to significantly enhance existing products or production processes. R&D costs also include the implementation of new knowledge through design, testing of product alternatives, or construction of prototypes. We expense all R&D costs as incurred, net of customer reimbursements for sales of prototypes and non-recurring engineering charges. We create prototypes and tools related to R&D projects. A prototype is defined as a constructed product not intended for production resulting in a commercial sale. We also incur engineering costs related to R&D activities. Such costs are incurred to support such activities to improve the reliability, performance and cost-effectiveness of our existing products and to design and develop innovative products that meet customer requirements for new applications. Furthermore, we may engage in activities that develop tooling machinery and equipment for our customers. Costs of molds, dies and other tools used to make products sold for which we have a contractual guarantee for lump sum reimbursement from the customer are included in other current assets on the Consolidated Balance Sheets until reimbursement is received from the customer. A summary of amounts to be received from customers is as follows: December 31, 2017 2016 Cost of molds, dies and other tools included in other current assets $ 3,382 $ 2,837 Reimbursements received from customers are netted against such costs and included in our Consolidated Statements of Earnings if the amount received is in excess of the costs that we incur. A summary of amounts received from customers is as follows: Years Ended December 31, 2017 2016 2015 Reimbursements received from customers $ 4,299 $ 2,036 $ 1,861 Financial Instruments: We use forward contracts to mitigate currency risk related to forecasted foreign currency revenue and costs. These forward contracts are designed as cash flow hedges. At least quarterly, we assess the effectiveness of these hedging relationships based on the total change in their fair value using regression analysis. In addition, we use interest rate swaps to convert a portion of our revolving credit facility's variable rate of interest into a fixed rate. As a result of the use of these derivative instruments, the Company is exposed to the risk that counterparties to derivative contracts will fail to meet their contractual obligations. To mitigate the counterparty credit risk, the Company has a policy of only entering into contracts with carefully selected major financial institutions based upon their credit ratings and other factors and by using netting agreements. Our established policies and procedures for mitigating credit risk on principal transactions include reviewing and establishing limits for credit exposure and continually assessing the creditworthiness of counterparties. We estimate the fair value of our financial instruments as follows: Instrument Method for determining fair value Cash, cash equivalents, accounts receivable and accounts payable Cost, approximates fair value due to the short-term nature of these instruments. Revolving credit facility The fair value of long-term debt approximates carrying value and was determined by valuing a similar hypothetical coupon bond and attributing that value to our credit facility. Interest rate swaps and forward contracts The fair value of our interest rate swaps and forward contracts are measured using a market approach which uses current industry information. Debt Issuance Costs: We have debt issuance costs related to our long-term debt that are being amortized using the straight-line method over the life of the debt. Stock-Based Compensation: We recognize expense related to the fair value of stock-based compensation awards, consisting of restricted stock units ("RSUs"), cash-settled restricted stock units, and stock options, in the Consolidated Statements of Earnings. We estimate the fair value of stock option awards on the date of grant using the Black-Scholes option pricing model. A number of assumptions are used by the Black-Scholes option pricing model to compute the grant date fair value of an award, including expected price volatility, option term, risk-free interest rate, and dividend yield. These assumptions are established at each grant date based upon current information at that time. Expected volatilities are based on historical volatilities of CTS' common stock. The expected option term is derived from historical data of exercise behavior. Actual option terms can differ from the expected option terms as a result of different groups of employees exhibiting different exercise behavior. The dividend yield is based on historical dividend payments. The risk-free rate for periods within the contractual life of the option is based on the U.S. Treasury yield curve at the time of grant. The fair value of awards that are ultimately expected to vest is recognized as expense over the requisite service periods of the awards in the Consolidated Statements of Earnings. The grant date fair values of our service-based and performance-based RSUs are the closing price of our common stock on the date of grant. The grant date fair value of our market-based RSUs is determined by using a simulation, or Monte Carlo, approach. Under this approach, stock returns from a comparative group of companies are simulated over the performance period, considering both stock price volatility and the correlation of returns. The simulated results are then used to estimate the future payout based on the performance and payout relationship established by the conditions of the award. The future payout is discounted to the measurement date using the risk-free interest rate. Both our stock option and RSU awards primarily have a graded vesting schedule. We recognize expense on a straight-line basis over the requisite service period for each separately vesting portion of the award as if the award was, in substance, multiple awards. See NOTE 15, "Stock-Based Compensation" for further information. In 2016, we elected to early adopt the provisions of ASU 2016-09 "Compensation-Stock Compensation (Topic 718): Improvement to Employee Share based Payment Accounting" . Pursuant to this adoption, we recorded excess tax benefits within income tax expense for the year ended December 31, 2016, where previously these were recorded as increases or decreases to additional contributed capital. In addition, we have elected to account for forfeitures of awards as they occur. Both of these changes have been applied prospectively, and therefore no adjustments were made to prior periods. In accordance with the guidance, we retrospectively reported cash paid on behalf of employees for withholding shares for tax-withholding purposes as a financing activity in the Consolidated Statements of Cash Flows. Additionally, excess tax benefits were classified as an operating activity, applied prospectively. Adoption of this ASU did not result in a material change in our earnings, cash flows, or financial position. Earnings Per Share: Basic earnings per share excludes any dilution and is computed by dividing net earnings available to common shareholders by the weighted-average number of common shares outstanding for the period. Diluted earnings per share reflects the potential dilution that could occur if dilutive securities, such as stock options and unvested restricted stock units, were exercised or resulted in the issuance of common stock. Diluted earnings per share is calculated by adding all potentially dilutive shares to the weighted average number of common shares outstanding for the numerator. If the common stock equivalents have an anti-dilutive effect, they are excluded from the computation of diluted earnings per share. Our antidilutive stock options and RSUs consist of the following: Years Ended December 31, (units) 2017 2016 2015 Antidilutive stock options and RSUs 22,110 35,189 13,979 Foreign Currencies: The financial statements of our non-U.S. subsidiaries, except the United Kingdom ("U.K.") subsidiary, are remeasured into U.S. dollars using the U.S. dollar as the functional currency with all remeasurement adjustments included in the determination of net earnings. Foreign currency gains (losses) recorded in the Consolidated Statement of Earnings includes the following: Years Ended December 31, 2017 2016 2015 Foreign currency gains (losses) $ 3,052 $ (3,714 ) $ (6,299 ) The assets and liabilities of our U.K. subsidiary are translated into U.S. dollars at the current exchange rate at period end, with the resulting translation adjustments made directly to the "accumulated other comprehensive loss" component of shareholders' equity. Consolidated Statement of Earnings accounts are translated at the average rates during the period. Shipping and Handling: All fees billed to the customer for shipping and handling is classified as a component of net sales. All costs associated with shipping and handling is classified as a component of cost of goods sold. Sales Taxes: We classify sales taxes on a net basis in our consolidated financial statements. Change in Estimate: Beginning in January 2017, we changed the method we use to calculate the service and interest cost components of net periodic benefit cost for our U.S. pension and other post-retirement benefit plans. Previously, we calculated the service and interest cost components using a single weighted-average discount rate derived from the yield curve to measure the benefit obligation at the beginning of the period. In 2017, we began using a full yield curve approach in the estimation of these components of benefit cost by applying the specific spot-rates along the yield curve to the relevant projected cash flows. This approach better aligns each of the projected benefit cash flows to the corresponding spot rates on the yield curve, resulting in a more precise measurement of service and interest costs. The change in method resulted in a decrease in the service and interest components of pension costs in 2017. Any decrease to these components as a result of adoption of this approach is equally offset by a decrease in the actuarial losses included in our accumulated other comprehensive loss, with no impact on the measurement of the benefit obligation. This change is accounted for prospectively as a change in accounting estimate. Reclassifications: Certain reclassifications have been made to prior year amounts to conform to the current year presentation. The reclassifications had no impact on previously reported net earnings. Recently Issued Accounting Pronouncements ASU 2017-12 "Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities" In August 2017, the Financial Accounting Standards Board ("FASB") issued Accountings Standards Update ("ASU") No 2017-12 "Derivatives and Hedging (Topic 815): Target Improvements to Accounting for Hedging Activities" . This ASU is meant to better align an entity's risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and presentation of the effects of the hedging instrument and the hedged item in the financial statements. This ASU is effective for annual periods beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted in any interim period after issuance. Any changes should be applied to all hedging relationships that exist at the date of adoption by applying a cumulative-effect adjustment related to eliminating the separate measurement of ineffectiveness to accumulated other comprehensive income with a corresponding adjustment to the opening balance of retained earnings as of the beginning of the fiscal year of adoption. Presentation and disclosure guidance is to be applied prospectively. We are still evaluating the impact this ASU may have on our financial statements. ASU 2017-07 "Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Post-retirement Benefit Cost" In March 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-07 "Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and net Periodic Post-retirement Benefit Cost" . This ASU is meant to improve the presentation of net periodic pension and net periodic post-retirement benefits costs. Currently, pension and post-retirement benefit costs are comprised of several components reflecting the different aspects of an employer's financial arrangements and cost of providing benefits to employees. These components are aggregated for reporting, but prior guidance does not prescribe where the net cost should be presented in the income statement or capitalized in assets. This ASU requires disaggregation of the service cost component from other components of net benefit cost and provides explicit guidance on how to present the service cost and other components in the income statement, allowing only the service cost component of net benefit costs to be eligible for capitalization. This ASU is effective for annual periods beginning after December 15, 2017, including interim periods within those periods. Early adoption is permitted as of the beginning of an annual period for which financial statements have not been issued or made available for issuance. These amendments should be applied retrospectively for the presentation of the service cost and other components of net periodic pension and net post-retirement benefit cost in the income statement and prospectively for the capitalization of the service cost and net periodic pension cost and periodic post-retirement benefit in assets. This ASU is not expected to have a material impact on our financial statements because the service cost component of our pension cost is expected to be immaterial to our financial results on a prospective basis. ASU 2017-04 "Intangibles -Goodwill and Other (Topic 305): Simplifying the Test for Goodwill Impairment" In January 2017, the FASB issued ASU No. 2017-04 "Intangibles - Goodwill and Other (Topic 305): Simplifying the Test for Goodwill Impairment" . This ASU is meant to simplify the subsequent measurement of goodwill for impairment by eliminating the current Step 2 analysis in computing the implied fair value of goodwill. In addition, this ASU requires an entity to consider income tax effects on any tax deductible goodwill on the carrying amount of the reporting unit when measuring an impairment loss, if applicable. Under this ASU, impairment is determined by comparing the reporting unit's fair value to the carrying value. This amendment is effective for fiscal years beginning after December 15, 2019, with early adoption permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. We do not expect this guidance to have an impact on our financial statements. ASU 2017-01 "Business Combinations (Topic 805): Clarifying the Definition of Business" In January 2017, the FASB issued ASU No. 2017-01 "Business Combinations (Topic 805): Clarifying the Definition of Business" . This ASU is meant to clarify the definition of a business to add guidance when determining when an acquisition or disposal should be accounted for as a sale or purchase of assets or a business. This ASU provides a more robust framework to use in determining when a set of assets or activities should be classified as a business, providing more consistency in accounting for business or asset acquisitions. This ASU is effective for public companies for fiscal years beginning after December 15, 2017, including interim periods within those periods. The ASU will be applied prospectively and it is not expected to have an impact on our financial statements. ASU 2016-16 "Income Taxes (Topic 740) Intra-Entity Transfers of Assets Other Than Inventory" In October 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-16, "Intra-Entity Transfers of Assets Other Than Inventory" . This ASU is meant to improve the accounting for the income tax effect of intra-entity transfers of assets other than inventory. Currently, U.S. GAAP prohibits the recognition of current and deferred income taxes for intra-entity asset transfers until the asset is sold to a third party. This ASU will now require companies to recognize the income tax effect of an intra-entity asset transfer (other than inventory) when the transaction occurs. This ASU is effective, for public companies for fiscal years beginning after December 15, 2019 and interim periods within those annual reporting periods. Early adoption is permitted and is to be applied on a modified retrospective bases through a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. This guidance is not expected to have a material impact on our consolidated financial statements. ASU 2016-15 "Statement of Cash Flows (Topic 230) Classification of Certain Cash Receipts and Cash Payments" In August 2016, the FASB issued ASU No. 2016-15, "Classification of Certain Cash Receipts and Cash Payments". This ASU reduces the diversity in reporting of eight specific cash flow issues due to accounting guidance that is unclear or does not exist. The eight issues relate to certain debt activities, business combination activities, insurance settlements and other various activities. This guidance is effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years. Early adoption is permitted and is to be applied retrospectively using a transition method for each period presented. An entity that elects early adoption of the amendment under this ASU must adopt all aspects of the amendment in the same period. This guidance is not expected to have a material impact on our consolidated financial statements. ASU 2016-02 "Leases (Topic 842)" In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)". This amendment created a new Topic under the accounting standards codification to account for the provisions of the ASU. This amendment is meant to provide transparency and to improve comparability between entities. The ASU requires companies to record an asset and liability on the balance sheet for leases that were formerly designated as operating leases as well as leases designated as financing leases. The provisions of the ASU predominately change the recognition of leases for lessees; the provisions do not substantially change the accounting for lessors. This ASU will supersede the provisions of Topic 840 Leases. The liability recorded for a lease is meant to recognize the lease payments and the asset as a right to use the underlying asset for the lease, including optional periods if it is reasonably certain the option will be exercised. Recording of the liability should be based on the present value of the lease payments. If a lease term is less than twelve months, a company is allowed to elect not to record the asset and liability. Expense related to these leases are to be amortized straight-line over the term of the lease. Additionally, the provisions of this ASU provide additional guidance on separating lease terms from maintenance and other type of provisions that provide a good or service, accounting for sale-leaseback provisions, and leveraged leases. Reporting in the cash flow statement remains virtually unchanged. Additional qualitative and quantitative disclosures are required. These updates are required to be applied under a modified retrospective approach from the beginning of the earlier period presented. The modified approach provides optional practical expedients that may be elected, which will allow companies to continue to account for leases under the previous guidance for leases that commenced prior to the effective date. The provisions of this ASU are effective for fiscal years beginning after December 15, 2018, and interim periods within those periods. Early adoption is allowed. The provisions of this guidance are still being evaluated and the impact on our financial statements has not yet been determined. ASU 2014-09 , "Revenue from Contracts with Customers (Topic 606)" In May 2014, the FASB issued ASU 2014-09, "R

Accounts Receivable

Accounts Receivable	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Accounts Receivable	Accounts Receivable The components of accounts receivable are as follows: As of December 31, 2017 2016 Accounts receivable, gross $ 70,941 $ 62,782 Less: Allowance for doubtful accounts (357 ) (170 ) Accounts receivable, net $ 70,584 $ 62,612

Inventories

Inventories	12 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories consist of the following: As of December 31, 2017 2016 Finished goods $ 9,203 $ 7,513 Work-in-process 12,065 9,596 Raw materials 21,150 17,680 Less: Inventory reserves (5,822 ) (6,137 ) Inventories, net $ 36,596 $ 28,652

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment is comprised of the following: As of December 31, 2017 2016 Land $ 1,130 $ 2,330 Buildings and improvements 64,201 63,621 Machinery and equipment 223,650 213,198 Less: Accumulated depreciation (200,734 ) (197,038 ) Property, plant and equipment, net $ 88,247 $ 82,111 Depreciation expense recorded in the Consolidated Statements of Earnings includes the following: For the Years Ended 2017 2016 2015 Depreciation expense $ 14,071 $ 13,177 $ 12,219

Retirement Plans

Retirement Plans	12 Months Ended
	Dec. 31, 2017
Retirement Benefits [Abstract]
Retirement Plans	Retirement Plans We have a number of noncontributory defined benefit pension plans ("pension plans") covering approximately 5% of our active employees. Pension plans covering salaried employees provide pension benefits that are based on the employees´ years of service and compensation prior to retirement. Pension plans covering hourly employees generally provide benefits of stated amounts for each year of service. We also provide post-retirement life insurance benefits for certain retired employees. Domestic employees who were hired prior to 1982 and certain domestic union employees are eligible for life insurance benefits upon retirement. We fund life insurance benefits through term life insurance policies and intend to continue funding all of the premiums on a pay-as-you-go basis. We recognize the funded status of a benefit plan in our consolidated balance sheets. The funded status is measured as the difference between plan assets at fair value and the projected benefit obligation. We also recognize, as a component of other comprehensive income, net of tax, the gains or losses and prior service costs or credits that arise during the period but are not recognized as components of net periodic benefit/cost. The measurement dates for the pension plans for our U.S. and non-U.S. locations were December 31, 2017 , and 2016 . During 2017, we offered certain former vested employees in our U.S. pension plan a one-time option to receive a lump sum distribution of their benefits from pension plan assets. The pension plan made approximately $ 23,912 in lump sum payments to settle its obligation to these participants. These settlement payments decreased the projected benefit obligation and plan assets by $ 23,912 , and resulted in a non-cash settlement charge of $ 13,476 related to unrecognized net actuarial losses that were previously included in accumulated other comprehensive loss. The measurement date of this settlement was December 31, 2017 . During 2014, we approved a plan to terminate the U.K. Limited Retirement Benefits Scheme ("the U.K. Plan"). The pension liability was settled in a purchased annuity. We completed the termination of the pension plan by the end of 2015, and a loss on settlement of this pension in the amount of $8,280 was recorded in restructuring and impairment charges in 2015. The following table provides a reconciliation of benefit obligation, plan assets, and the funded status of the pension plans for U.S. and non-U.S. locations at the measurement dates. U.S. Pension Plans Non-U.S. Pension Plans 2017 2016 2017 2016 Accumulated benefit obligation $ 228,934 $ 247,276 $ 2,535 $ 2,295 Change in projected benefit obligation: Projected benefit obligation at January 1 $ 247,276 $ 256,924 $ 2,866 $ 2,796 Service cost — 87 48 51 Interest cost 8,273 11,024 34 46 Benefits paid (39,177 ) (20,537 ) (210 ) (289 ) Actuarial loss (gain) 12,562 (222 ) 164 229 Foreign exchange impact — — 238 33 Projected benefit obligation at December 31 $ 228,934 $ 247,276 $ 3,140 $ 2,866 Change in plan assets: Assets at fair value at January 1 $ 292,044 $ 289,315 $ 1,523 $ 1,480 Actual return on assets 31,559 23,163 17 11 Company contributions 336 103 319 303 Benefits paid (39,177 ) (20,537 ) (210 ) (289 ) Foreign exchange impact — — 128 18 Assets at fair value at December 31 $ 284,762 $ 292,044 $ 1,777 $ 1,523 Funded status (plan assets less projected benefit obligations) $ 55,828 $ 44,768 $ (1,363 ) $ (1,343 ) The measurement dates for the post-retirement life insurance plan were December 31, 2017 , and 2016 . The following table provides a reconciliation of benefit obligation, plan assets, and the funded status of the post-retirement life insurance plan at those measurement dates. Post-Retirement 2017 2016 Accumulated benefit obligation $ 5,134 $ 4,952 Change in projected benefit obligation: Projected benefit obligation at January 1 $ 4,952 $ 4,886 Service cost 2 3 Interest cost 161 207 Benefits paid (165 ) (165 ) Actuarial loss 184 21 Projected benefit obligation at December 31 $ 5,134 $ 4,952 Change in plan assets: Assets at fair value at January 1 $ — $ — Actual return on assets — — Company contributions 165 165 Benefits paid (165 ) (165 ) Other — — Assets at fair value at December 31 $ — $ — Funded status (plan assets less projected benefit obligations) $ (5,134 ) $ (4,952 ) The components of the prepaid (accrued) cost of the domestic and foreign pension plans are classified in the following lines in the Consolidated Balance Sheets at December 31: U.S.Pension Plans Non-U.S. Pension Plans 2017 2016 2017 2016 Prepaid pension asset $ 57,050 $ 46,183 $ — $ — Accrued expenses and other liabilities (100 ) (317 ) — — Long-term pension obligations (1,122 ) (1,098 ) (1,363 ) (1,343 ) Net prepaid (accrued) cost $ 55,828 $ 44,768 $ (1,363 ) $ (1,343 ) The components of the accrued cost of the post-retirement life insurance plan are classified in the following lines in the Consolidated Balance Sheets at December 31: Post-Retirement 2017 2016 Accrued expenses and other liabilities $ (418 ) $ (387 ) Long-term pension obligations (4,716 ) (4,565 ) Total accrued cost $ (5,134 ) $ (4,952 ) We have also recorded the following amounts to accumulated other comprehensive loss for the U.S. and non-U.S. pension plans, net of tax: U.S.Pension Plans Non-U.S. Pension Plans Unrecognized Prior Total Unrecognized Balance at January 1, 2016 $ 96,388 $ — $ 96,388 $ 1,639 Amortization of retirement benefits, net of tax (3,817 ) — (3,817 ) 85 Net actuarial (loss) gain (2,808 ) — (2,808 ) 12 Foreign exchange impact — — — 7 Balance at January 1, 2017 $ 89,763 $ — $ 89,763 $ 1,743 Amortization of retirement benefits, net of tax (3,685 ) — (3,685 ) 10 Settlements (8,585 ) — (8,585 ) — Net actuarial (loss) gain (1,753 ) — (1,753 ) 2 Foreign exchange impact — — — 143 Balance at December 31, 2017 $ 75,740 $ — $ 75,740 $ 1,898 We have recorded the following amounts to accumulated other comprehensive loss for the post-retirement life insurance plan, net of tax: Unrecognized Balance at January 1, 2016 $ (669 ) Amortization of retirement benefits, net of tax 95 Net actuarial gain 14 Balance at January 1, 2017 $ (560 ) Amortization of retirement benefits, net of tax 64 Net actuarial gain 117 Balance at December 31, 2017 $ (379 ) The accumulated actuarial gains and losses and prior service costs and credits included in other comprehensive income are amortized in the following manner: The component of unamortized net gains or losses related to our qualified pension plans is amortized based on the expected future life expectancy of the plan participants (estimated to be approximately 18 years at December 31, 2017 ), because substantially all of the participants in those plans are inactive. The component of unamortized net gains or losses related to our post-retirement life insurance plan is amortized based on the estimated remaining future service period of the plan participants (estimated to be approximately 3 years at December 31, 2017 ). The Company uses a market-related approach to value plan assets, reflecting changes in the fair value of plan assets over a five-year period. The variance resulting from the difference between the expected and actual return on plan assets is included in the amortization calculation upon reflection in the market-related value of plan assets. In 2018 , we expect to recognize approximately $5,888 of pre-tax losses included in accumulated other comprehensive loss related to our Pension Plans. We do not expect to recognize any significant such amounts related to the post-retirement life insurance plan in 2018 . The projected benefit obligation, accumulated benefit obligation and fair value of plan assets for those Pension Plans with accumulated benefit obligation in excess of fair value of plan assets is shown below: As of December 31, 2017 2016 Projected benefit obligation $ 4,361 $ 4,281 Accumulated benefit obligation 3,757 3,710 Fair value of plan assets 1,776 1,523 Net pension (income) expense includes the following components: Years Ended Years Ended U.S. Pension Plans Non-U.S. Pension Plans 2017 2016 2015 2017 2016 2015 Service cost $ — $ 87 $ 171 $ 48 $ 51 $ 63 Interest cost 8,273 11,024 11,258 34 46 465 Expected return on plan assets (1) (16,243 ) (18,976 ) (20,272 ) (20 ) (26 ) (446 ) Amortization of unrecognized loss 5,785 5,994 6,339 155 140 7,492 Additional cost due to early retirement — — — — — 651 Settlement loss 13,476 — — — — — Net expense (income) $ 11,291 $ (1,871 ) $ (2,504 ) $ 217 $ 211 $ 8,225 Weighted-average actuarial assumptions (2) Benefit obligation assumptions: Discount rate 3.63 % 4.16 % 4.43 % 1.38 % 1.13 % 1.63 % Rate of compensation increase 0.00 % 0.00 % 0.00 % 2.00 % 2.00 % 2.00 % Pension income/expense assumptions: Discount rate 4.16 % 4.43 % 4.07 % 1.13 % 1.63 % 3.13 % Expected return on plan assets (1) 5.61 % 6.63 % 7.00 % 1.13 % 1.63 % 2.00 % Rate of compensation increase 0.00 % 0.00 % 0.00 % 2.00 % 2.00 % 0.48 % (1) Expected return on plan assets is net of expected investment expenses and certain administrative expenses. (2) During the fourth quarter of each year, we review our actuarial assumptions in light of current economic factors to determine if the assumptions need to be adjusted. Net post-retirement expense includes the following components: Post-Retirement Years Ended December 31, 2017 2016 2015 Service cost $ 2 $ 3 $ 5 Interest cost 161 207 204 Amortization of unrecognized gain (101 ) (149 ) (101 ) Net expense $ 62 $ 61 $ 108 Weighted-average actuarial assumptions (1) Benefit obligation assumptions: Discount rate 3.59 % 4.10 % 4.43 % Rate of compensation increase 0 % 0 % 0 % Pension income/post-retirement expense assumptions: Discount rate 4.10 % 4.43 % 4.07 % Rate of compensation increase 0 % 0 % 0 % (1) During the fourth quarter of each year, we review our actuarial assumptions in light of current economic factors to determine if the assumptions need to be adjusted. The discount rate utilized to estimate our pension and post-retirement obligations is based on market conditions at December 31, 2017 , and is determined using a model consisting of high quality bond portfolios that match cash flows of the plans' projected benefit payments based on the plan participants' service to date and their expected future compensation. Use of the rate produced by this model generates a projected benefit obligation that equals the current market value of a portfolio of high quality bonds whose maturity dates match the timing and amount of expected future benefit payments. The discount rate used to determine 2017 pension income and post-retirement expense for our pension and post-retirement plans is based on market conditions at December 31, 2016 , and is the interest rate used to estimate interest incurred on the outstanding projected benefit obligations during the period. We utilize a building block approach in determining the long-term rate of return for plan assets. Historical markets are reviewed and long-term relationships between equities and fixed-income are preserved consistent with the generally accepted capital market principle that assets with higher volatility generate a greater return over the long term. Current market factors such as inflation and interest rates are evaluated before long-term capital market assumptions are determined. The long-term portfolio return is established via a building block approach with proper consideration of diversification and rebalancing. Peer data and historical returns are reviewed to ensure for reasonableness and appropriateness. Our pension plan asset allocation at December 31, 2017 , and 2016 , and target allocation for 2018 by asset category are as follows: Target Allocations Percentage of Plan Assets Asset Category 2018 2017 2016 Equity securities (1) 13% 11% 25% Debt securities 83% 82% 59% Other 4% 7% 16% Total 100% 100% 100% (1) Equity securities include CTS common stock in the amount of $ 0 at December 31, 2017 and approximately $17,700 ( 6% of total plan assets) at December 31, 2016 . We employ a liability-driven investment strategy whereby a mix of equity and fixed-income investments are used to pursue a de-risking strategy which over time seeks to reduce interest rate mismatch risk and other risks while achieving a return that matches or exceeds the growth in projected pension plan liabilities. Risk tolerance is established through careful consideration of plan liabilities and funded status. The investment portfolio primarily contains a diversified mix of equity and fixed-income investments. Other assets such as private equity are used modestly to enhance long-term returns while improving portfolio diversification. Investment risk is measured and monitored on an ongoing basis through quarterly investment portfolio reviews, annual liability measurements, and asset/liability studies at regular intervals. The following table summarizes the fair values of our pension plan assets: As of December 31, 2017 2016 Equity securities - U.S. holdings (1) $ 19,487 $ 43,708 Equity securities - non-U.S. holdings (1) 1,131 819 Equity funds - U.S. holdings (1) 1,314 28,052 Bond funds - government (5) 3,126 22,237 Bond funds - other (6) 231,710 150,712 Real estate (7) 1,235 3,812 Cash and cash equivalents (2) 11,145 7,823 Partnerships (4) 10,787 12,862 International hedge funds (3) 6,604 23,542 Total fair value of plan assets $ 286,539 $ 293,567 The fair values at December 31, 2017 , are classified within the following categories in the fair value hierarchy: Quoted Prices Significant Significant Not Leveled Total Equity securities - U.S. holdings (1) $ 19,487 $ — $ — $ — $ 19,487 Equity securities - non-U.S. holdings (1) 1,131 — — — 1,131 Equity funds - U.S. holdings (1) — 1,314 — — 1,314 Bond funds - government (5) — 3,126 — — 3,126 Bond funds - other (6) — 231,710 — — 231,710 Real estate (7) (8) — — — 1,235 1,235 Cash and cash equivalents (2) 11,145 — — — 11,145 Partnerships (4) — — 10,787 — 10,787 International hedge funds (3) (8) — — — 6,604 6,604 Total $ 31,763 $ 236,150 $ 10,787 $ 7,839 $ 286,539 The fair values at December 31, 2016 , are classified within the following categories in the fair value hierarchy: Quoted Prices Significant Significant Not Leveled Total Equity securities - U.S. holdings (1) $ 43,708 $ — $ — $ — $ 43,708 Equity securities - non-U.S. holdings (1) 819 — — — 819 Equity funds - U.S.holdings (1) — 28,052 — — 28,052 Bond funds - government (5) — 22,237 — — 22,237 Bond funds - other (6) — 150,712 — — 150,712 Real estate (7) (8) — — — 3,812 3,812 Cash and cash equivalents (2) 7,823 — — — 7,823 Partnerships (4) — — 12,862 — 12,862 International hedge funds (3) (8) — — — 23,542 23,542 Total $ 52,350 $ 201,001 $ 12,862 $ 27,354 $ 293,567 (1) Comprised of common stocks of companies in various industries. The Pension Plan fund manager may shift investments from value to growth strategies or vice-versa, from small cap to large cap stocks or vice-versa, in order to meet the Pension Plan's investment objectives, which are to provide for a reasonable amount of long-term growth of capital without undue exposure to volatility, and protect the assets from erosion of purchasing power. (2) Comprised of investment grade short-term investment and money-market funds. (3) This fund allocates its capital across several direct hedge-fund organizations. This fund invests with hedge funds that employ "non-directional" strategies. These strategies do not require the direction of the markets to generate returns. The majority of these hedge funds generate returns by the occurrence of key events such as bankruptcies, mergers, spin-offs, etc. Investments can be redeemed at the Share Net Asset Value ("NAV") as of the last business day of each calendar quarter with at least a sixty-five day prior written notice to the administrator. (4) Comprised of partnerships that invest in various U.S. and international industries. (5) Comprised of long-term government bonds with a minimum maturity of 10 years and zero-coupon Treasury securities ("Treasury Strips") with maturities greater than 20 years. (6) Comprised predominately of investment grade U.S. corporate bonds with maturities greater than 10 years and U.S. high-yield corporate bonds; emerging market debt (local currency sovereign bonds, U.S. dollar-denominated sovereign bonds and U.S. dollar-denominated corporate bonds); and U.S. bank loans. (7) Comprised of investments in securities of U.S. and non-U.S. real estate investment trusts (REITs), real estate operating companies and other companies that are principally engaged in the real estate industry and of investments in global private direct commercial real estate. Investments can be redeemed immediately following the valuation date with a notice of at least fifteen business days before valuation. (8) Comprised of investments that are measured at fair value using the NAV per share practical expedient. In accordance with the provisions of ASC 820-10, these investments have not been classified in the fair value hierarchy. The fair value amount not leveled is presented to allow reconciliation of the fair value hierarchy to total fund pension plan assets. The pension plan assets recorded at fair value are measured and classified in a hierarchy for disclosure purposes consisting of three levels based on the observability of inputs available in the marketplace used to measure fair value as discussed below: • Level 1: Fair value measurements that are based on quoted prices (unadjusted) in active markets that the pension plan trustees have the ability to access for identical assets or liabilities. Market price data generally is obtained from exchange or dealer markets. • Level 2: Fair value measurements based on inputs other than quoted prices included in Level 1 that are observable for the asset, either directly or indirectly. Level 2 inputs include quoted prices for similar assets in active or inactive markets, and inputs other than quoted prices that are observable for the asset, such as interest rates and yield curves that are observable at commonly quoted intervals. • Level 3: Fair value measurements based on valuation techniques that use significant inputs that are unobservable. The table below reconciles the Level 3 partnership assets within the fair value hierarchy: Amount Fair value of Level 3 partnership assets at January 1, 2016 $ 13,360 Capital contributions 1,419 Realized and unrealized gain 584 Capital distributions (2,501 ) Fair value of Level 3 partnership assets at December 31, 2016 12,862 Capital contributions 343 Realized and unrealized gain 2,107 Capital distributions (4,525 ) Fair value of Level 3 partnership assets at December 31, 2017 $ 10,787 The partnership fund manager uses a market approach in estimating the fair value of the plan's Level 3 asset. The market approach estimates fair value by first determining the entity's earnings before interest, taxes, depreciation and amortization and then multiplying that value by an estimated multiple. When establishing an appropriate multiple, the fund manager considers recent comparable private company transactions and multiples paid. The entity's net debt is then subtracted from the calculated amount to arrive at an estimated fair value for the entity. We expect to make $101 of contributions to the U.S. plans and $331 of contributions to the non-U.S. plans during 2018 . The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid: U.S. Non-U.S. Post-Retirement 2018 $ 15,693 $ 67 $ 418 2019 15,705 72 405 2020 15,673 242 392 2021 15,548 63 378 2022 15,361 69 363 2023-2026 72,669 532 1,610 Total $ 150,649 $ 1,045 $ 3,566 Defined Contribution Plans We sponsor a 401(k) plan that covers substantially all of our U.S. employees. Contributions and costs are generally determined as a percentage of the covered employee's annual salary. Expenses related to defined contribution plans include the following: Years Ended December 31, 2017 2016 2015 401(k) and other plan expense $ 3,141 $ 2,841 $ 3,352

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets We evaluate finite-lived intangible assets for impairment if indicators of impairment exist. No indicators were identified for the years ended December 31, 2017 , or December 31, 2016 . Other intangible assets consist of the following: As of December 31, 2017 Gross Accumulated Net Weighted Average Remaining Amortization Period (in years) Other intangible assets: Customer lists / relationships $ 64,323 $ (33,685 ) $ 30,638 10.5 Patents 10,319 (10,319 ) — — Technology and other intangibles 44,460 (10,355 ) 34,105 8.3 In process research and development 2,200 — 2,200 — Other intangible assets, net $ 121,302 $ (54,359 ) $ 66,943 10.5 Amortization expense for the year ended December 31, 2017 $ 6,603 Amortization expense remaining for other intangible assets is as follows: Amortization 2018 $ 6,763 2019 6,754 2020 6,624 2021 6,467 2022 6,230 Thereafter 34,105 Total future amortization expense $ 66,943 As of December 31, 2016 Gross Accumulated Net Other intangible assets: Customer lists / relationships $ 63,386 $ (30,318 ) $ 33,068 Patents 10,319 (10,319 ) — Technology and other intangibles 36,715 (7,613 ) 29,102 In process research and development 2,200 — 2,200 Other intangible assets, net $ 112,620 $ (48,250 ) $ 64,370 Amortization expense for the year ended December 31, 2016 $ 5,815 Amortization expense for the year ended December 31, 2015 $ 4,035 In 2017, a goodwill impairment test was performed by management with the assistance of a third-party valuation firm. As of December 31, 2017 , it was concluded that the fair value of each of our reporting units exceeded their carrying values, and accordingly, no goodwill impairment was required. Changes in the net carrying value amount of goodwill were as follows: Total Goodwill as of December 31, 2015 $ 33,865 Increase from acquisitions 27,879 Goodwill as of December 31, 2016 61,744 Increase from acquisition 9,313 Goodwill as of December 31, 2017 $ 71,057

Costs Associated with Exit and

Costs Associated with Exit and Restructuring Activities	12 Months Ended
	Dec. 31, 2017
Restructuring and Related Activities [Abstract]
Costs Associated with Exit and Restructuring Activities	Costs Associated with Exit and Restructuring Activities Restructuring and impairment charges are reported as a separate line within operating earnings in the Consolidated Statements of Earnings. Restructuring-related charges are recorded as a component of cost of goods sold. Total restructuring, impairment and restructuring-related charges were: Years Ended December 31, 2017 2016 2015 Restructuring-related charges $ — $ — $ 631 Restructuring and impairment charges 4,139 3,048 14,564 Total restructuring, impairment, and restructuring-related charges $ 4,139 $ 3,048 $ 15,195 In June 2016, we announced plans to restructure operations by phasing out production at the Elkhart facility by mid-2018 and transitioning it into a research and development center supporting our global operations ("June 2016 Plan"). Additional organizational changes will also occur in various other locations. In 2017, we amended this plan to include costs related to the relocation of our corporate headquarters and Bolingbrook, Illinois manufacturing operations. The cost of the plan is expected to be approximately $13,400 including severance and other one-time benefit arrangements. We have recorded $ 2,927 of termination and other one-time benefit charges impacting approximately 230 employees as of December 31, 2017 . Additional costs related to line movements, equipment charges, and other costs will be expensed as incurred. The total restructuring liability related to the June 2016 Plan was $ 1,460 at December 31, 2017 . The following table displays the planned restructuring and impairment charges associated with the June 2016 Plan as well as a summary of the actual costs incurred through December 31, 2017 : June 2016 Plan Planned Costs Actual costs Workforce reduction $ 3,075 $ 2,927 Building and equipment relocation 9,025 3,574 Other charges 1,300 686 Restructuring and impairment charges $ 13,400 $ 7,187 Total restructuring and impairment charges for the June 2016 Plan were as follows: Years Ended December 31, 2017 2016 Restructuring and impairment charges $ 4,139 $ 3,048 Not included in restructuring and impairment charges, but directly attributable to the June 2016 Plan, is an increase in tax expense of $2,316 relating to increases in valuation allowances on deferred tax assets for state net operating losses and tax credits and the revaluation of U.S. deferred taxes as a result of a change in our expected future tax rate as discussed in Note 17 "Income Taxes" in 2016. During April 2014, we announced plans to restructure our operations and consolidate our Canadian operations into other existing facilities as part of our overall plan to simplify our business model and rationalize our global footprint ("April 2014 Plan"). These restructuring actions, which were substantially completed during 2015, resulted in the elimination of approximately 120 positions. The following table displays the planned restructuring and restructuring-related charges associated with the April 2014 Plan, as well as a summary of the actual costs incurred through December 31, 2017 : April 2014 Plan Planned Actual costs Inventory write-down $ 850 $ — Equipment relocation 1,800 444 Other charges 1,400 113 Restructuring-related charges, included in cost of goods sold 4,050 557 Workforce reduction 4,200 4,423 Other charges, including pension termination costs 1,700 3,413 Restructuring and impairment charges 5,900 7,836 Total restructuring, impairment and restructuring-related charges $ 9,950 $ 8,393 Under the April 2014 Plan, there were no restructuring, impairment, and restructuring-related charges for the years ended December 31, 2017 and December 31, 2016 . Restructuring, impairment, and restructuring-related charges were $4,923 for the year ended December 31, 2015 . The total restructuring liability related to the April 2014 Plan was $ 453 at December 31, 2017 . During June 2013, we announced a restructuring plan to simplify our global footprint by consolidating manufacturing facilities into existing locations. This Plan included (1) the consolidation of operations from the U.K. manufacturing facility into the Czech Republic facility, (2) the consolidation of operations from the Carol Stream, Illinois manufacturing facility into the Juarez, Mexico facility, and (3) the discontinuation of manufacturing at the Singapore facility. Certain corporate functions were consolidated or eliminated as a result of the June 2013 Plan and also as a result of the sale of our EMS business. These restructuring actions called for the elimination of approximately 480 positions. The following table displays the planned restructuring and restructuring-related charges associated with the June 2013 Plan, as well as a summary of the actual costs incurred through completion of the plan as of December 31, 2015: June 2013 Plan Planned Actual costs Inventory write-down $ 800 $ 1,143 Equipment relocation 900 1,792 Other charges 100 702 Restructuring-related charges, included in cost of goods sold 1,800 3,637 Workforce reduction 10,150 9,615 Asset impairment charge 3,000 4,139 Other charges, including pension termination costs 7,650 10,205 Restructuring and impairment charges 20,800 23,959 Total restructuring and restructuring-related charges $ 22,600 $ 27,596 Under the June 2013 Plan, restructuring, impairment and restructuring-related charges were $10,272 for the year ended December 31, 2015. Actions under this plan were complete by the end of 2015 and no liability remains related to the June 2013 Plan as of December 31, 2017 . The following table displays the restructuring liability activity for the year ended December 31, 2017 : June 2013 Plan and April 2014 Plan and June 2016 Plan Restructuring Liability Restructuring liability at January 1, 2017 $ 2,162 Restructuring charges 4,139 Cost paid (4,445 ) Other activities (1) 57 Restructuring liability at December 31, 2017 $ 1,913 (1) Other activities includes currency translation adjustments not recorded through restructuring expense. Total restructuring liability included in Other long-term obligations is $187 at December 31, 2017 . The remaining liability of $1,726 is included in Accrued expenses and other liabilities at December 31, 2017 .

Accrued Liabilities and Other L

Accrued Liabilities and Other Liabilities	12 Months Ended
	Dec. 31, 2017
Payables and Accruals [Abstract]
Accrued Liabilities	Accrued Expenses and Other Liabilities The components of accrued expenses and other liabilities are as follows: As of December 31, 2017 2016 Accrued product-related costs $ 5,297 $ 5,556 Accrued income taxes 5,475 9,826 Accrued property and other taxes 997 1,917 Dividends payable 1,318 1,309 Remediation reserves 17,067 18,176 Other accrued liabilities 11,190 8,924 Total accrued expenses and other liabilities $ 41,344 $ 45,708

Contingencies

Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies Certain processes in the manufacture of our current and past products create by-products classified as hazardous waste. We have been notified by the U.S. Environmental Protection Agency, state environmental agencies, and in some cases, groups of potentially responsible parties, that we are potentially liable for environmental contamination at several sites currently and formerly owned or operated by CTS. Some sites, such as Asheville, North Carolina and Mountain View, California, are designated National Priorities List Superfund sites under the U.S. Environmental Protection Agency’s Superfund program. We reserve for probable remediation activities at these sites and for claims and proceedings against CTS with respect to other environmental matters. We record reserves on an undiscounted basis. In the opinion of management, based upon presently available information relating to such matters, adequate provision for probable and estimable costs have been recorded. We do not have any known environmental obligations where a loss is probable or reasonably possible of occurring for which we do not have a reserve, nor do we have any amounts for which we have not reserved because the amount of the loss cannot be reasonably estimated. Due to the inherent nature of environmental obligations, we cannot provide assurance that our ultimate environmental liability will not materially exceed the amount of our current reserve. Our reserve and disclosures will be adjusted accordingly if additional information becomes available in the future. A roll forward of remediation reserves on the balance sheet is comprised of the following: Years Ended December 31, 2017 2016 2015 Balance at beginning of period $ 18,176 $ 20,603 $ 3,918 Remediation expense 307 556 18,591 Remediation payments (1,416 ) (2,983 ) (1,906 ) Balance at end of the period $ 17,067 $ 18,176 $ 20,603 Unrelated to the environmental claims described above, certain other legal claims are pending against us with respect to matters arising out of the ordinary conduct of our business. Although the ultimate outcome of any potential litigation resulting from these claims cannot be predicted with certainty, and some may be disposed of unfavorably to CTS, management believes that adequate provision for anticipated costs have been established based upon all presently available information. Except as noted herein, we do not believe we have any pending loss contingencies that are probable or reasonably possible of having a material impact on our consolidated financial position, results of operations or cash flows.

Leases

Leases	12 Months Ended
	Dec. 31, 2017
Leases [Abstract]
Leases	Leases Minimum future obligations under all non-cancelable operating leases as of December 31, 2017 , are as follows: Operating Leases 2018 $ 3,631 2019 2,887 2020 1,722 2021 996 2022 954 Thereafter 11,161 Total minimum lease obligations $ 21,351 Rent expense for operating leases charged to operations was as follows: Years Ended December 31, 2017 2016 2015 Rent expense $ 4,762 $ 5,694 $ 3,550 Operating leases include a variety of properties around the world. These properties are used as manufacturing facilities, distribution centers and sales offices. Lease expirations range from 2018 to 2033 with breaking periods specified in the lease agreements. Sublease income was $ 445 in 2017 . Future sublease income is $ 500 in 2018 , $ 487 in 2019 , and $1,404 thereafter. Some of our operating leases include renewal options and escalation clauses. In the fourth quarter of 2012, one of our foreign locations entered into a sale-leaseback transaction. As a result of this transaction, a deferred gain of approximately $4,500 was being amortized over the 6 year expected lease term. During 2015, we terminated the lease and recognized the remaining unamortized deferred gain into income. A gain of $2,108 was included in the Consolidated Statements of Earnings for the year ended December 31, 2015.

Debt

Debt	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Debt	Debt Long-term debt was comprised of the following: As of December 31 2017 2016 Total credit facility $ 300,000 $ 300,000 Balance outstanding $ 76,300 $ 89,100 Standby letters of credit $ 2,065 $ 2,165 Amount available $ 221,635 $ 208,735 Weighted-average interest rate 2.30 % 1.90 % Commitment fee percentage per annum 0.25 % 0.25 % The revolving credit facility requires, among other things, that we comply with a maximum total leverage ratio and a minimum fixed charge coverage ratio. Failure to comply with these covenants could reduce the borrowing availability under the revolving credit facility. We were in compliance with all debt covenants as of December 31, 2017 . The revolving credit facility requires us to deliver quarterly financial statements, annual financial statements, auditors certifications and compliance certificates within a specified number of days after the end of a quarter and year. Additionally, the revolving credit facility contains restrictions limiting our ability to dispose of assets; incur certain additional debt; repay other debt or amend subordinated debt instruments; create liens on assets; make investments, loans or advances; make acquisitions or engage in mergers or consolidations; engage in certain transactions with our subsidiaries and affiliates; and make stock repurchases and dividend payments. Interest rates on the revolving credit facility fluctuate based upon the London Interbank Offered Rate and the Company's quarterly total leverage ratio. We pay a commitment fee on the undrawn portion of the revolving credit facility. The commitment fee varies based on the quarterly leverage ratio. We have debt issuance costs related to our long-term debt that are being amortized using the straight-line method over the life of the debt. Amortization expense was approximately $185 in 2017 , $163 in 2016 , and $175 in 2015 , and was recognized as interest expense. We use interest rate swaps to convert the revolving credit facility's variable rate of interest into a fixed rate on a portion of the debt as described more fully in Note 12. These swaps are treated as cash flow hedges and consequently, the changes in fair value were recorded in other comprehensive earnings. Interest rate swaps activity recorded in other comprehensive earnings before tax included the following: Years Ended December 31, 2017 2016 2015 Unrealized (loss) gain $ (255 ) $ 593 $ (516 ) Realized gain reclassified to interest expense $ 37 $ 928 $ 768

Derivatives Derivative Financia

Derivatives Derivative Financial Instruments (Notes)	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivatives Our earnings and cash flows are subject to fluctuations due to changes in foreign currency exchange rates and interest rates. We selectively use derivative financial instruments including foreign currency forward contracts and interest rate swaps to manage our exposure to these risks. The use of derivative financial instruments exposes the Company to credit risk, which relates to the risk of nonperformance by a counterparty to the derivative contracts. We manage our credit risk by entering into derivative contracts with only highly rated financial institutions and by using netting agreements. Foreign Currency Hedges In January of 2016, we began using forward contracts to mitigate currency risk related to a portion of our forecasted foreign Euro denominated revenues and Mexican Peso denominated expenses. The currency forward contracts are designed as cash flow hedges and are recorded in the Consolidated Balance Sheets at fair value. At least quarterly, we assess the effectiveness of these hedging relationships based on the total change in their fair value using regression analysis. The effective portion of derivative gains and losses are recorded in accumulated other comprehensive loss until the hedged transaction affects earnings upon settlement, at which time they are reclassified to net sales and cost of goods sold. Ineffectiveness is recorded in other income (expense) in our Consolidated Statements of Earnings. If it becomes probable that an anticipated transaction that is hedged will not occur by the end of the originally specified time period, we reclassify the gains or losses related to that hedge from accumulated other comprehensive loss to other income (expense). As of December 31, 2017 , we were hedging a portion of our forecasted Peso expenses and Euro denominated revenue for the following twelve months. We continue to monitor the Company’s overall currency exposure and may elect to add cash flow hedges in the future. At December 31, 2017 , we had a net unrealized loss of $ 683 in accumulated other comprehensive loss, of which $ 567 is expected to be reclassified to income within the next 12 months. The notional amount of foreign currency forward contracts outstanding was $ 33.2 million at December 31, 2017 . Interest Rate Swaps We use interest rate swaps to convert the revolving credit facility’s variable rate of interest into a fixed rate on a portion of our debt balance. In the second quarter of 2012, we entered into four separate one-year interest rate swap agreements to fix interest rates on $50,000 of long-term debt for the periods January 2013 to January 2017. In the third quarter of 2012, we entered into four additional one-year interest rate swap agreements to fix interest rates on $25,000 of long-term debt for the periods January 2013 to January 2017. In the third quarter of 2016, we entered into three additional one-year interest rate swap agreements to fix interest rates on $50,000 of long-term debt for the periods August 2017 to August 2020. The difference to be paid or received under the terms of the swap agreements will be recognized as an adjustment to interest expense when settled. These swaps are treated as cash flow hedges and consequently, the changes in fair value were recorded in other comprehensive income (loss). The estimated net amount of the existing gains or losses that are reported in accumulated other comprehensive income (loss) that is expected to be reclassified into earnings within the next twelve months is approximately $ 278 . The location and fair values of derivative instruments designated as hedging instruments in the Consolidated Balance Sheets as of December 31, 2017 , are shown in the following table: As of December 31, 2017 2016 Foreign currency hedges reported in Accrued expenses and other liabilities $ 742 $ 601 Interest rate swaps reported in Other current assets $ 278 $ 2 Interest rate swaps reported in Other assets $ 693 $ 751 The Company has elected to net its foreign currency derivative assets and liabilities in the balance sheet in accordance with ASC 210-20 (Balance Sheet, Offsetting). On a gross basis, there were $ 97 foreign currency derivative assets and foreign currency derivative liabilities were $ 839 . The effect of derivative instruments on the Consolidated Statements of Earnings is as follows: Years Ended December 31, 2017 2016 2015 Foreign Exchange Contracts: Amounts reclassified from AOCI to earnings Net sales $ (488 ) $ (124 ) $ — Cost of goods sold 497 111 — Selling, general and administrative 45 1 — Total amounts reclassified from AOCI to earnings 54 (12 ) — Loss recognized in other expense for hedge ineffectiveness (1 ) (1 ) — Loss recognized in other expense for derivatives not designated as cash flow hedges (15 ) (5 ) — Total derivative gain (loss) on foreign exchange contracts recognized in earnings 38 (18 ) — Interest Rate Swaps: Interest Expense $ (37 ) $ (928 ) $ (768 ) Total income (loss) on derivatives recognized in earnings $ 1 $ (946 ) $ (768 ) The table below provides a reconciliation of the recurring financial assets and liabilities related to interest rate swaps and foreign currency hedges: Interest Rate Foreign Currency Hedges Balance at January 1, 2016 $ (768 ) $ — Settled in cash — 54 Total gains (losses) for the period: Included in earnings 928 (18 ) Included in other comprehensive earnings (loss) 593 (637 ) Balance at January 1, 2017 $ 753 $ (601 ) Settled in cash — (132 ) Total gains (losses) for the period: Included in earnings — 38 Included in other comprehensive earnings (loss) 218 (47 ) Balance at December 31, 2017 $ 971 $ (742 )

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Shareholders' equity includes certain items classified as accumulated other comprehensive loss ("AOCI") in the Consolidated Balance Sheets, including: • Unrealized gains (losses) on hedges relate to interest rate swaps to convert the revolving credit facility's variable rate of interest into a fixed rate and foreign currency forward contracts used to hedge our exposure to changes in exchange rates affecting certain revenues and costs denominated in foreign currencies. These hedges are designated as cash flow hedges, and we have deferred income statement recognition of gains and losses until the hedged transaction is settled. Amounts reclassified to income from AOCI for hedges are included in interest expense. Further information related to our interest rate swaps is included in NOTE 12, "Derivatives". • Unrealized gains (losses) on pension obligations are deferred from income statement recognition until the gains or losses are realized. Amounts reclassified to income from AOCI are included in net periodic pension expense. Further information related to our pension obligations is included in NOTE 5, "Retirement Plans". • Cumulative translation adjustment relates to our non-U.S. subsidiaries that have designated a functional currency other than the U.S. dollar. We are required to translate the subsidiary functional currency financial statements to dollars using a combination of historical, period-end, and average foreign exchange rates. This combination of rates creates the foreign currency translation adjustment component of other comprehensive income. Transfer of foreign currency translation gains and losses from AOCI to income are included in other income (expense) in our Consolidated Statements of Earnings. The components of AOCI for 2017 are as follows: As of December 31, 2016 Gain (Loss) Gain (Loss) As of December 31, 2017 Changes in fair market value of hedges: Gross $ 116 $ 264 $ (91 ) $ 289 Income tax expense (benefit) (42 ) (96 ) 33 (105 ) Net 74 168 (58 ) 184 Changes in unrealized pension cost: Gross (151,618 ) — 21,522 (130,096 ) Income tax expense (benefit) 60,672 — (7,835 ) 52,837 Net (90,946 ) — 13,687 (77,259 ) Cumulative translation adjustment: Gross (2,414 ) 429 — (1,985 ) Income tax expense (benefit) 92 8 — 100 Net (2,322 ) 437 — (1,885 ) Total accumulated other comprehensive (loss) income $ (93,194 ) $ 605 $ 13,629 $ (78,960 ) The components of AOCI for 2016 are as follows: As of December 31, 2015 (Loss) Gain Gain (Loss) As of December 31, 2016 Changes in fair market value of hedges: Gross $ (768 ) $ (56 ) $ 940 $ 116 Income tax expense (benefit) 289 20 (351 ) (42 ) Net (479 ) (36 ) 589 74 Changes in unrealized pension cost: Gross (161,719 ) — 10,101 (151,618 ) Income tax expense (benefit) 64,361 — (3,689 ) 60,672 Net (97,358 ) — 6,412 (90,946 ) Cumulative translation adjustment: Gross (1,279 ) (1,135 ) — (2,414 ) Income tax expense (benefit) 111 (19 ) — 92 Net (1,168 ) (1,154 ) — (2,322 ) Total accumulated other comprehensive (loss) income $ (99,005 ) $ (1,190 ) $ 7,001 $ (93,194 )

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2017
Stockholders' Equity Note [Abstract]
Shareholders' Equity	Shareholders' Equity Share count and par value data related to shareholders' equity are as follows: As of December 31, 2017 2016 Preferred Stock Par value per share No par value No par value Shares authorized 25,000,000 25,000,000 Shares outstanding — — Common Stock Par value per share No par value No par value Shares authorized 75,000,000 75,000,000 Shares issued 56,632,488 56,456,516 Shares outstanding 32,938,466 32,762,494 Treasury stock Shares held 23,694,022 23,694,022 We use the cost method to account for our common stock purchases. During the years ended December 31, 2017 , and December 31, 2016 , we did not purchase any shares of common stock under our board-authorized share repurchase program. Approximately $17,554 is available for future purchases. A roll forward of common shares outstanding is as follows: As of December 31, 2017 2016 Balance at beginning of the year 32,762,494 32,548,477 Restricted stock unit issuances 175,972 214,017 Balance at end of period 32,938,466 32,762,494

Equity-Based Compensation

Equity-Based Compensation	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity-Based Compensation	-Based Compensation At December 31, 2017 , we had four stock-based compensation plans: the Non-Employee Directors' Stock Retirement Plan ("Directors' Plan"), the 2004 Omnibus Long-Term Incentive Plan ("2004 Plan"), the 2009 Omnibus Equity and Performance Incentive Plan ("2009 Plan"), and the 2014 Performance & Incentive Plan ("2014 Plan"). Future grants can only be made under the 2014 Plan. The 2009 Plan, and previously the 2004 Plan, provided for grants of incentive stock options or nonqualified stock options to officers, key employees, and non-employee members of the Board of Directors. In addition, the 2014 Plan, the 2009 Plan, and the 2004 Plan allow for grants of stock appreciation rights, restricted stock, restricted stock units ("RSUs"), performance shares, performance-based restricted stock units, and other stock awards. The following table summarizes the compensation expense included in selling, general and administrative expenses in the Consolidated Statements of Earnings related to stock-based compensation plans: Years Ended December 31, 2017 2016 2015 Service-Based RSUs $ 1,762 $ 1,997 $ 1,944 Performance-Based RSUs 2,350 665 1,235 Cash-settled awards 72 76 16 Total $ 4,184 $ 2,738 $ 3,195 Income tax benefit 1,573 1,029 1,201 Net $ 2,611 $ 1,709 $ 1,994 The fair value of all equity awards that vested during the periods ended December 31, 2017 , 2016 , and 2015 were $5,471 , $4,959 , and $2,803 , respectively. We recorded a tax deduction related to equity awards that vested during the year ended December 31, 2017 , in the amount of $1,927 . The following table summarizes the unrecognized compensation expense related to non-vested RSUs by type and the weighted-average period in which the expense is to be recognized: Unrecognized Weighted- Service-Based RSUs $ 1,079 1.11 years Performance-Based RSUs 2,313 1.62 years Total $ 3,392 1.46 years We recognize expense on a straight-line basis over the requisite service period for each separately vesting portion of the award as if the award was, in substance, multiple awards. The following table summarizes the status of these plans as of December 31, 2017 : 2014 Plan 2009 Plan 2004 Plan Directors' Plan Awards originally available to be granted 1,500,000 3,400,000 6,500,000 N/A Performance stock options outstanding 295,000 — — — Maximum potential RSU and cash settled awards outstanding 725,759 122,600 57,391 9,620 Maximum potential awards outstanding 1,020,759 122,600 57,391 9,620 RSUs and cash settled awards vested and released 176,221 — — — Awards available to be granted 303,020 — — — Stock Options Stock options are exercisable in cumulative annual installments over a maximum 10 -year period, commencing at least one year from the date of grant. Stock options are generally granted with an exercise price equal to the market price of our stock on the date of grant. The stock options generally vest over four years and have a 10 -year contractual life. The awards generally contain provisions to either accelerate vesting or allow vesting to continue on schedule upon retirement if certain service and age requirements are met. The awards also provide for accelerated vesting if there is a change in control event. We estimate the fair value of the stock option on the grant date using the Black-Scholes option-pricing model and assumptions for expected price volatility, option term, risk-free interest rate, and dividend yield. Expected price volatilities are based on historical volatilities of our common stock. The expected option term was derived from historical data of exercise behavior. The dividend yield was based on historical dividend payments. The risk-free rate for periods within the contractual life of the option was based on the U.S. Treasury yield curve in effect at the time of grant. There were no outstanding stock options at December 31, 2017 , or 2016 other than the performance-based stock options described below. Performance-Based Stock Options During 2015 and 2016, the Compensation committee of the Board of Directors (the "Committee") granted a total of 295,000 performance-based stock options (including forfeitures). The Performance-Based Option Awards have an exercise price of $ 18.37 , a term of five years and generally will become exercisable (provided the optionee remains employed by the Company or an affiliate) upon our attainment of at least $600,000 in revenues during any of our four-fiscal-quarter trailing periods (as determined by the Committee) during the term. We have not recognized any expense on these Performance-Based Option Awards for the years ended December 31, 2017 and 2016 , since the revenue target is not deemed likely to be attained based on our current forecast. Service-Based Restricted Stock Units Service-based RSUs entitle the holder to receive one share of common stock for each unit when the unit vests. RSUs are issued to officers, key employees and non-employee directors as compensation. Generally, the RSUs vest over a three -year period. RSUs granted to non-employee directors have historically vested one month after being granted, except beginning in 2016 they vest one year after being granted. Upon vesting, the non-employee directors elect to either receive the stock associated with the RSU immediately, or defer receipt of the stock to a future date. The fair value of the RSUs is equivalent to the trading value of our common stock on the grant date. A summary of RSUs for all Plans is presented below: Units Weighted Weighted Aggregate Outstanding at January 1, 2017 554,478 $ 13.37 Granted 57,740 24.32 Released (201,918 ) 13.85 Forfeited (10,953 ) 17.11 Outstanding at December 31, 2017 399,347 $ 14.60 24.58 $ 10,283 Releasable at December 31, 2017 259,811 $ 12.48 33.88 $ 6,690 Years Ended December 31, 2017 2016 2015 Weighted-average grant date fair value $ 24.32 $ 15.07 $ 17.31 Intrinsic value of RSUs released $ 4,485 $ 1,520 $ 2,933 A summary of nonvested RSUs is presented below: RSUs Weighted Nonvested at January 1, 2017 251,245 $ 15.81 Granted 57,740 $ 24.32 Vested (158,496 ) $ 16.40 Forfeited (10,953 ) $ 17.11 Nonvested at December 31, 2017 139,536 $ 18.56 Performance-Based Restricted Stock Units We grant performance-based restricted stock unit awards ("PSUs") to certain executives and key employees. Units are usually awarded in the range from zero percent to 200% of a targeted number of shares. The award rate for the 2015-2017, 2016-2018, and 2017-2019 PSUs is dependent upon our achievement of sales growth targets, cash flow targets, and relative total shareholder return ("RTSR") using a matrix based on the percentile ranking of our stock price performance compared to a peer group over a three -year period. These awards are weighted 35 % for achievement of the sales growth metric, 30% for achievement of the cash flow metric, and 35% for achievement of the RTSR metric. Other PSUs are granted from time to time based on other performance criteria. A summary of PSUs for all Plans is presented below: Units Weighted Weighted Aggregate Outstanding at January 1, 2016 201,900 $ 16.48 Granted 123,919 $ 23.83 Released (43,275 ) $ 21.66 Forfeited (26,524 ) $ 22.56 Added by performance factor 15,285 $ 21.66 Outstanding at December 31, 2017 271,305 $ 18.77 1.62 $ 6,986 Releasable at December 31, 2017 — $ — — $ — The following table summarizes each grant of performance awards outstanding at December 31, 2017 : Description Grant Date Vesting Vesting Target Outstanding Maximum Number of Units to be Granted 2015-2017 Performance RSUs February 5, 2015 2018 35% RTSR, 35% sales growth, 30% cash flow 62,000 124,000 2016-2018 Performance RSUs February 16, 2016 2019 35% RTSR, 35% sales growth, 30% cash flow 92,840 185,680 2017-2019 Performance RSUs February 9, 2017 2020 35% RTSR, 35% sales growth, 30% cash flow 71,796 143,592 2017-2019 Performance RSUs February 9, 2017 2018- 2020 Operating Income 40,669 40,669 Single Crystal Performance RSUs March 31, 2016 2019 Various 4,000 8,000 Total 271,305 501,941 Cash-Settled Restricted Stock Units Cash-Settled RSUs entitle the holder to receive the cash equivalent of one share of common stock for each unit when the unit vests. These RSUs are issued to key employees residing in foreign locations as direct compensation. Generally, these RSUs vest over a three -year period. Cash-settled RSUs are classified as liabilities and are remeasured at each reporting date until settled. At December 31, 2017 , and 2016 , we had 14,082 and 12,074 cash-settled RSUs outstanding, respectively. At December 31, 2017 , and 2016 , liabilities of $241 and $170 , respectively were included in Accrued expenses and other liabilities on our Consolidated Balance Sheets.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The table below summarizes the financial assets and liabilities that were measured at fair value on a recurring basis as of December 31, 2017 and the (gain) loss recorded during the year ended December 31, 2017 : Asset (Liability) Carrying Quoted Prices Significant Significant (Gain) loss for Year Ended Interest rate swap — cash flow hedge $ 971 $ — $ 971 $ — $ 37 Foreign currency hedges $ (742 ) $ — $ (742 ) $ — $ (38 ) The table below summarizes the financial liability that was measured at fair value on a recurring basis as of December 31, 2016 and the (gain) loss recorded during the year ended December 31, 2016 : Asset (Liability) Carrying Quoted Prices Significant Significant (Gain) loss for Interest rate swap — cash flow hedge $ 753 $ — $ 753 $ — $ (928 ) Foreign currency hedges $ (601 ) $ (601 ) $ 18 The fair value of our interest rate swaps and foreign currency hedges were measured using standard valuation models using market-based observable inputs over the contractual terms, including forward yield curves, among others. There is a readily determinable market for these derivative instruments, but the market is not active and therefore they are classified within level 2 of the fair value hierarchy. The table below provides a reconciliation of the recurring financial assets and liabilities related to interest rate swaps and foreign currency hedges: Interest Rate Foreign Currency Hedges Balance at January 1, 2016 $ (768 ) $ — Settled in cash — 54 Total gains (losses) for the period: Included in earnings 928 (18 ) Included in other comprehensive earnings (loss) 593 (637 ) Balance at January 1, 2017 $ 753 $ (601 ) Settled in cash — (132 ) Total gains (losses) for the period: Included in earnings — 38 Included in other comprehensive earnings (loss) 218 (47 ) Balance at December 31, 2017 $ 971 $ (742 ) Our long-term debt consists of a revolving debt facility which is recorded at its carrying value. There is a readily determinable market for our revolving credit debt and it is classified within Level 2 of the fair value hierarchy as the market is not deemed to be active. The fair value of long-term debt approximates carrying value and was determined by valuing a similar hypothetical coupon bond and attributing that value to our credit facility.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Earnings before income taxes consist of the following: Years Ended December 31, 2017 2016 2015 U.S. $ 9,315 $ 25,746 $ (141 ) Non-U.S. 30,938 31,499 12,402 Total $ 40,253 $ 57,245 $ 12,261 Significant components of income tax provision/(benefit) are as follows: Years Ended December 31, 2017 2016 2015 Current: U.S. $ 1,635 $ (1,312 ) $ 329 Non-U.S. 7,150 13,729 12,482 Total Current 8,785 12,417 12,811 Deferred: U.S. 17,597 13,245 (15,795 ) Non-U.S. (577 ) (2,797 ) 8,291 Total Deferred 17,020 10,448 (7,504 ) Total provision for income taxes $ 25,805 $ 22,865 $ 5,307 Significant components of our deferred tax assets and liabilities are as follows: As of December 31, 2017 2016 Post-retirement benefits $ 1,160 $ 1,798 Inventory reserves 1,128 1,834 Loss carry-forwards 5,401 7,279 Credit carry-forwards 10,793 22,743 Nondeductible accruals 7,062 11,629 Research expenditures 20,002 31,380 Stock compensation 1,803 2,681 Foreign exchange loss 1,373 1,780 Other 220 648 Gross deferred tax assets 48,942 81,772 Depreciation and amortization 9,819 9,960 Pensions 12,387 16,024 Subsidiaries' unremitted earnings 1,662 1,292 Gross deferred tax liabilities 23,868 27,276 Net deferred tax assets 25,074 54,496 Deferred tax asset valuation allowance (8,182 ) (11,024 ) Total net deferred tax assets $ 16,892 $ 43,472 The long-term deferred tax assets and long-term deferred tax liabilities are as follows below: As of December 31, 2017 2016 Non-current deferred tax assets 20,694 45,839 Non-current deferred tax liabilities (3,802 ) (2,367 ) Total net deferred tax assets 16,892 43,472 In 2016, we elected to early adopt ASU 2015-17 "Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes", on a retrospective basis allowing for all deferred tax items to be classified as non-current. Certain non-current deferred tax assets and non-current deferred tax liabilities were not netted since these items relate to different tax jurisdictions. At each reporting date, we weigh all available positive and negative evidence to assess whether it is more-likely-than-not that the Company's deferred tax assets, including deferred tax assets associated with accumulated loss carryforwards and tax credits in the various jurisdictions in which it operates, will be realized. As of December 31, 2017 , and 2016 , we recorded deferred tax assets related to certain U.S. state and non-U.S. income tax loss carryforwards of $5,401 and $7,279 , respectively, and U.S. and non-U.S. tax credits of $10,793 and $ 22,743 , respectively. The deferred tax assets expire in various years primarily between 2022 and 2035. The Company remeasured its U.S. deferred tax assets and liabilities at the applicable federal tax rate of 21% in accordance with the Tax Cuts and Jobs Act of 2017. The remeasurement resulted in a total decrease in these assets of $ 6,267 . Generally, we assess if it is more-likely-than-not that our net deferred tax assets will be realized during the available carry-forward periods. As a result, we have determined that valuation allowances of $8,182 and $11,024 should be provided for certain deferred tax assets at December 31, 2017 , and 2016 , respectively. As of December 31, 2017 , the valuation allowances relate to certain U.S. state and non-U.S. loss carry-forwards and certain U.S. state tax credits that management does not anticipate will be utilized. The increase in the valuation allowance from December 31, 2015, to December 31, 2016, is primarily due to the June 2016 restructuring activities and changes in management's judgment regarding realizability of the related assets. No valuation allowance was recorded in 2017 against the U.S. federal foreign tax credit carryforwards of $3,711 , which expire in 2024 and 2025 as well as the research and development tax credits of $7,249 . which expire in varying amounts between 2022 and 2037. We assessed the anticipated realization of those tax credits utilizing future taxable income projections. Based on those projections, management believes it is more-likely-than-not that we will realize the benefits of these credit carryforwards. The following table reconciles taxes at the U.S. federal statutory rate to the effective income tax rate: Years Ended December 31, 2017 2016 2015 Taxes at the U.S. statutory rate 35.0 % 35.0 % 35.0 % State income taxes, net of federal income tax benefit 1.1 % 1.4 % (0.1 )% Non-U.S. income taxed at rates different than the U.S. statutory rate (9.0 )% (7.5 )% (16.7 )% Foreign source income, net of associated foreign tax credits 0.1 % 5.3 % 6.9 % Benefit of tax credits (1.4 )% (1.0 )% (4.6 )% Non-deductible expenses 1.5 % 0.7 % 1.3 % Stock compensation - excess tax benefits (1.5 )% (0.8 )% — % Adjustment to valuation allowances (4.4 )% 3.8 % 37.8 % Benefit from prior period foreign tax credits — % — % (133.0 )% Change in unrecognized tax benefits 2.0 % 3.3 % 59.5 % Impacts of unremitted foreign earnings 0.9 % 0.6 % 60.8 % Impacts related to the 2017 Tax Cuts and Jobs Act 44.7 % — % — % Other (4.9 )% (0.9 )% (3.6 )% Effective income tax rate 64.1 % 39.9 % 43.3 % During 2015, we changed our position regarding the U.S. federal tax treatment of foreign taxes paid. We claimed a foreign tax credit on our 2014 and 2015 U.S. federal income tax returns and filed amended tax returns for 2006 through 2013 in order to claim non-U.S. taxes paid as a credit against income tax, rather than as a deduction. The filing of the amended returns reduced the deferred tax asset for federal loss carryforwards by $8,214 , and increased our available foreign tax credit carryforward by $24,519 , resulting in a net tax benefit of $16,305 , recorded in 2015. On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (the “Act”) was signed into law making significant changes to the Internal Revenue Code. Changes include, but are not limited to, a corporate tax rate decrease from 35% to 21% effective for tax years beginning after December 31, 2017, the transition of U.S international taxation from a worldwide tax system to a territorial system, and a one-time transition tax on the mandatory deemed repatriation of cumulative foreign earnings as of December 31, 2017. The Company has calculated its best estimate of the impact of the Act in its year-end income tax provision in accordance with its understanding of the Act and guidance available as of the date of this filing, and as a result has recorded $ 18,001 as an additional income tax expense in the fourth quarter of 2017, the period in which the legislation was enacted. The provisional amount related to the remeasurement of certain deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future was $6,267. The provisional amount related to the one-time transition tax on the mandatory deemed repatriation of foreign earnings was $ 11,734 . On December 22, 2017, Staff Accounting Bulletin No. 118 ("SAB 118") was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Act. In accordance with SAB 118, the Company has determined that the $6,267 of deferred tax expense recorded in connection with the remeasurement of certain deferred tax assets and liabilities and the $11,734 of current tax expense recorded in connection with the transition tax on the mandatory deemed repatriation of foreign earnings are provisional amounts and reasonable estimates at December 31, 2017. Additional work is necessary to do a more detailed analysis of historical foreign earnings as well as potential correlative adjustments. Any subsequent adjustment to these amounts will be recorded to current tax expense in the quarter of 2018 when the analysis is complete. In general, outside of Canada and the United Kingdom, it is our historical practice to permanently reinvest the earnings of our non-U.S. subsidiaries in those operations. Although we plan to permanently reinvest the earnings of our Chinese facilities outside the U.S., we have determined that we will not maintain those earnings in China in order to mitigate future currency risk. Therefore, as of December 31, 2017 , a provision for the expected tax expense on repatriation of those earnings of $ 370 was recorded. However, as a result of the Act, we can repatriate our cumulative undistributed foreign earnings to the U.S. when needed with minimal U.S. income tax consequences other than the one-time deemed repatriation charge. We will continue to evaluate whether to repatriate all or a portion of the cumulative undisributed foreign earnings based on expansion needs and as circumstances change. We are still evaluating whether to change our indefinite reinvestment assertion in light of the Act and consider that conclusion to be incomplete under guidance issued by SAB 118. If we subsequently change our assertion during the measurement period, we will account for the change in assertion as a change in estimate related to the enactment of the Act. The Act also includes provisions for Global Intangible Low-Taxed Income (“GILTI”) wherein taxes on foreign income are imposed in excess of a deemed return on tangible assets of foreign corporations. This income will effectively be taxed in general at a 10.5% tax rate. Because of the complexity of these provisions, we have not completed our analysis of their potential impact to our deferred tax assets and liabilities, or whether to (i) account for GILTI as a component of tax expense in the period in which the company is subject to the rules (the “period cost method”), or (ii) account for GILTI in the company’s measurement of deferred taxes (the “deferred method”). We continue to evaluate the impacts of GILTI as we further understand its implications as well as related, and yet to be issued, regulatory rules, regulations and interpretations. We recognize the financial statement benefit of a tax position when it is more-likely-than-not, based on its technical merits, that the position will be sustained upon examination. A tax position that meets the more-likely-than-not threshold is then measured to determine the amount of benefit recognized in the financial statements. As of December 31, 2017 , we have approximately $7,306 of unrecognized tax benefits, which if recognized, would impact the effective tax rate. We do not anticipate any significant changes in our unrecognized tax benefits within the next 12 months. A reconciliation of the beginning and ending unrecognized tax benefits is provided below: 2017 2016 Balance at January 1 $ 12,347 $ 11,008 Increase related to current year tax positions — 1,088 Increase related to prior year tax positions 1,290 251 Decrease related to settlements with taxing authorities (6,331 ) — Balance at December 31 $ 7,306 $ 12,347 Our continuing practice is to recognize interest and/or penalties related to unrecognized tax benefits as income tax expense. As of December 31, 2017 , and 2016 , $2,596 and $1,772 , respectively, of interest and penalties were accrued. We are subject to taxation in the U.S., various states, and in non-U.S. jurisdictions. Our U.S. income tax returns are primarily subject to examination from 2013 through 2016; however, U.S. tax authorities also have the ability to review prior tax years to the extent loss carryforwards and tax credit carryforwards are utilized. The open years for the non-U.S. tax returns range from 2008 through 2016 based on local statutes.

Business Acquisitions

Business Acquisitions	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Business Acquisitions	Business Acquisitions On May 15, 2017, we acquired 100% of the equity interests in Noliac A/S, a privately-held company, for $19.3 million in cash. Noliac A/S is a designer and manufacturer of tape cast and bulk piezoelectric material as well as transducers for use in the telecommunications, industrial, medical, and defense industries. This acquisition will enable us to increase our product base within our ceramics product lines as well as expand our presence in the European market. The purchase price of $19,121, net of cash acquired of $ 199 , has been allocated to the assets acquired and liabilities assumed on the acquisition date based on their fair values. The following table summarizes the fair values of the assets acquired and the liabilities assumed at the date of acquisition: Fair Values at May 15, 2017 Current assets $ 2,836 Property, plant and equipment 580 Other assets 395 Goodwill 9,313 Intangible assets 9,142 Fair value of assets acquired 22,266 Less fair value of liabilities acquired (3,145 ) Net cash paid $ 19,121 Goodwill recorded in connection with this acquisition represents the value we expect to be created by combining the operations of the acquired business with our existing operations, including the expansion into markets within our existing business, access to new customers, and potential cost savings and synergies. Goodwill related to this acquisition is expected to be deductible for tax purposes. The following table summarizes the carrying amounts and weighted average lives of the acquired intangible assets: Carrying Value Weighted Average Amortization Period (in years) Developed technology $ 7,581 15.0 Customer relationships 937 10.0 Other 624 3.0 Total $ 9,142 13.7 We incurred $ 291 in transaction related costs during the year ended December 31, 2017. These costs are included in selling, general, and administrative costs in our Consolidated Statements of Earnings. On March 11, 2016, we acquired all of the outstanding membership interests in CTG Advanced Materials, LLC (“CTG-AM”), a privately-held company, for $73 million in cash plus a working capital adjustment. CTG-AM, formerly operated as H.C. Materials, is the market leading designer and manufacturer of single crystal piezoelectric materials, serving major original equipment manufacturers throughout the medical marketplace. These materials enable high definition ultrasound imaging (3D and 4D), as well as intravascular ultrasound applications. Other applications for these materials include wireless pacemakers, implantable hearing aids, and defense technologies. With the CTG-AM acquisition, we gained technology and proprietary manufacturing methods that expand our offering of piezoelectric materials. This allows us to become the leading large-scale commercial producer of both single crystal materials and traditional piezoelectric ceramics. The purchase price of $73,063, net of cash acquired of $ 4 , has been allocated to the fair values of assets and liabilities acquired as of March 11, 2016. The following table summarizes the fair values of the assets acquired and the liabilities assumed at the date of acquisition: Fair Values at March 11, 2016 Current assets $ 4,215 Property, plant and equipment 6,173 Other assets 37 Goodwill 27,879 Intangible assets 35,427 Fair value of assets acquired 73,731 Less fair value of liabilities acquired (668 ) Net cash paid $ 73,063 Goodwill recorded in connection with this acquisition represents the value we expect to be created by combining the operations of the acquired business with our existing operations, including the expansion into markets within our existing business, access to new customers, and potential cost savings and synergies. Goodwill related to this acquisition is expected to be deductible for tax purposes. The following table summarizes the carrying amounts and weighted average lives of the acquired intangible assets: Carrying Value Weighted Average Amortization Period (in years) Developed technology $ 23,730 15.0 Customer relationships and contracts 11,502 14.6 Other 195 0.8 Total $ 35,427 14.8 We incurred $ 804 in transaction related costs during the year ended December 31, 2016. These costs are included in selling, general, and administrative costs in our Consolidated Statements of Earnings.

Geographic Data

Geographic Data	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Geographic Data	Geographic Data Financial information relating to our operations by geographic area were as follows: Net Sales Years Ended December 31, 2017 2016 2015 United States $ 287,092 $ 276,033 $ 238,796 Singapore 5,596 6,668 8,379 China 66,510 59,506 55,825 Canada — — 24,519 Czech Republic 34,476 34,767 36,348 Other non-U.S. 29,319 19,705 18,443 Consolidated net sales $ 422,993 $ 396,679 $ 382,310 Sales are attributed to countries based upon the origin of the sale. Long-Lived Assets Years Ended December 31, 2017 2016 United States $ 45,354 $ 42,488 China 32,464 33,013 United Kingdom 590 569 Taiwan 3,540 2,755 Czech Republic 5,518 2,634 Other non-U.S 781 652 Consolidated long-lived assets $ 88,247 $ 82,111

Quarterly Financial Data

Quarterly Financial Data	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Data	Quarterly Financial Data Quarterly Results of Operations (Unaudited) First Second Third Fourth 2017 Net sales $ 100,154 $ 105,686 $ 106,243 $ 110,910 Gross margin $ 34,224 $ 35,794 $ 37,538 $ 32,875 Operating earnings (loss) $ 12,196 $ 13,208 $ 13,111 $ (19 ) Net earnings (loss) $ 8,484 $ 9,966 $ 9,619 $ (13,621 ) Basic earnings (loss) per share $ 0.26 $ 0.30 $ 0.29 $ (0.41 ) Diluted earnings (loss) per share $ 0.25 $ 0.30 $ 0.29 $ (0.41 ) 2016 Net sales $ 96,705 $ 98,693 $ 99,697 $ 101,584 Gross margin $ 33,468 $ 34,457 $ 36,641 $ 35,861 Operating earnings $ 12,433 $ 24,097 $ 12,490 $ 14,146 Net earnings $ 7,863 $ 14,487 $ 3,720 $ 8,310 Basic earnings per share $ 0.24 $ 0.44 $ 0.11 $ 0.25 Diluted earnings per share $ 0.24 $ 0.44 $ 0.11 $ 0.25

SCHEDULE II - VALUATION AND QUA

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS	12 Months Ended
	Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS	CTS CORPORATION SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS (in thousands) Balance at Charged to Expense Charged (Write-offs) / Recoveries Balance Year ended December 31, 2017 $ 170 $ 248 $ 9 $ (70 ) $ 357 Year ended December 31, 2016 $ 133 $ 44 $ — $ (7 ) $ 170 Year ended December 31, 2015 $ 100 $ 33 $ — $ — $ 133

Summary of Significant Accoun29

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Description of Business	Description of Business: CTS Corporation ("CTS", "we", "our", "us" or the "Company") is a global manufacturer of sensors, electronic components, and actuators. We operate manufacturing facilities located throughout North America, Asia and Europe and service major markets globally. CTS consists of one reportable business segment.
Principles of Consolidation	Principles of Consolidation: The consolidated financial statements include the accounts of CTS and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated.
Fiscal Calendar	Fiscal Calendar: We began using a calendar period end in 2016. Prior to that, we operated on a 4 week/ 4 week/ 5 week fiscal quarter, and each fiscal quarter ended on a Sunday. The fiscal year always began on January 1 and ended on December 31. Our fiscal calendar resulted in some fiscal quarters being either longer or shorter than 13 weeks, depending on the days of the week on which those dates fell.
Use of Estimates	Use of Estimates: The preparation of financial statements in conformity with the accounting principles generally accepted in the United States of America ("U.S. GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ materially from those estimates.
Cash and Cash Equivalents	Cash and Cash Equivalents: All highly liquid investments with maturities of three months or less at the date of purchase are considered to be cash equivalents.
Accounts Receivable and Allowance for Doubtful Accounts	Accounts Receivable and Allowance for Doubtful Accounts: Accounts receivable consists primarily of amounts due from normal business activities. We maintain an allowance for doubtful accounts for estimated uncollectible accounts receivable. Our reserves for estimated credit losses are based upon historical experience and specific customer collection issues. Accounts are written off against the allowance account when they are determined to no longer be collectible.
Concentration of Credit Risk	Concentration of Credit Risk: Financial instruments that potentially subject us to concentrations of credit risk consist of cash and cash equivalents. Our cash and cash equivalents, at times, may exceed federally insured limits. Cash and cash equivalents are deposited primarily in banking institutions with global operations. We have not experienced any losses in such accounts. We believe we are not exposed to any significant credit risk on cash and cash equivalents. Trade receivables subject us to the potential for credit risk with major customers. We sell our products to customers principally in the transportation, industrial, medical, defense and aerospace, information technology, and communications markets, primarily in North America, Europe, and Asia. We perform ongoing credit evaluations of our customers to minimize credit risk. We do not require collateral. The allowance for doubtful accounts is based on management's estimates of the collectability of its accounts receivable after analyzing historical bad debts, customer concentrations, customer creditworthiness, and current economic trends. Uncollectible trade receivables are charged against the allowance for doubtful accounts when all reasonable efforts to collect the amounts due have been exhausted.
Inventories	Inventories: We value our inventories at the lower of the actual cost to purchase or manufacture or the net realizable value using the first-in, first-out ("FIFO") method. We review inventory quantities on hand and record a provision for excess and obsolete inventory based on forecasts of product demand and production requirements.
Retirement Plans	Retirement Plans: We have various defined benefit and defined contribution retirement plans. Our policy is to annually fund the defined benefit pension plans at or above the minimum required by law. We: 1) recognize the funded status of a benefit plan (measured as the difference between plan assets at fair value and the benefit obligation) in our Consolidated Balance Sheets; 2) recognize the gains or losses and prior service costs or credits that arise during the period but are not recognized as components of net periodic benefit/cost as a component of other comprehensive earnings; and 3) measure defined benefit plan assets and obligations as of the date of our fiscal year-end. See NOTE 5, "Retirement Plans" for further information.
Property, Plant and Equipment	Property, Plant and Equipment: Property, plant and equipment is stated at cost. Depreciation and amortization is computed primarily over the estimated useful lives of the various classes of assets using the straight-line method. Useful lives for buildings and improvements range from 10 to 45 years . Machinery and equipment useful lives range from 3 to 15 years . Depreciation on leasehold improvements is computed over the lesser of the lease term or estimated useful lives of the assets. Amounts expended for maintenance and repairs are charged to expense as incurred. Upon disposition, any related gains or losses are included in operating earnings.
Income Taxes	Income Taxes: We account for income taxes under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements. Under this method, we determine deferred tax assets and liabilities on the basis of the differences between the financial statement and tax bases of assets and liabilities by using enacted tax rates in effect for the year in which the differences are expected to reverse. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date. We recognize deferred tax assets to the extent that we believe that these assets are more-likely-than-not to be realized. In making such a determination, we consider all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies, and results of recent operations. If we determine that we would be able to realize our deferred tax assets in the future in excess of their net recorded amount, we would make an adjustment to the deferred tax asset valuation allowance, which would reduce the provision for income taxes. In 2016, we elected to early adopt ASU 2015-17 "Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes", on a retrospective basis allowing for all deferred tax items to be classified as non-current. Certain non-current deferred tax assets and non-current deferred tax liabilities were not netted since these items relate to different tax jurisdictions. We record uncertain tax positions in accordance with ASC 740 on the basis of a two-step process in which (1) we determine whether it is more-likely-than-not that the tax positions will be sustained on the basis of the technical merits of the position and (2) for those tax positions that meet the more-likely-than-not recognition threshold, we recognize the largest amount of tax benefit that is more than 50 percent likely to be realized upon ultimate settlement with the related tax authority. We recognize interest and penalties related to unrecognized tax benefits on the income tax expense line in the accompanying Consolidated Statements of Operations. Accrued interest and penalties are included on the related tax liability line in the Consolidated Balance Sheets. See NOTE 17, "Income Taxes" for further information.
Goodwill and Other Intangible Assets	Goodwill and Indefinite-lived Intangible Assets: Goodwill represents the excess of the purchase price over the fair values of the net assets acquired in a business combination. We test the impairment of goodwill at least annually, or more frequently if events or changes in circumstances indicate that the carrying value may not be recoverable. The impairment evaluation utilizes a two-step test. The first step compares the fair value of each reporting unit to its carrying value, including goodwill. If the fair value of the reporting unit is equal to or greater than its carrying value, goodwill is not impaired and no further testing is required. If the carrying value exceeds fair value, then the second step of the impairment test is performed in order to determine if the implied fair value of the goodwill of the reporting unit exceeds the carrying value of that goodwill. Goodwill is impaired when the carrying value of the goodwill exceeds its implied fair value. Impaired goodwill is written down to its implied fair value through a non-cash expense recorded in results of operations in the period the impairment is identified. In 2015, we changed the date of our annual impairment test from the last day of our fiscal year to the first day of our fourth quarter. This change did not have a material effect on the results of our impairment test. We completed our annual impairment test during 2017 and determined that our goodwill was not impaired as of the measurement date. No goodwill impairment was recorded for the years ended December 31, 2017 , 2016 and 2015 . We also have acquired in-process research and development ("IPR&D") intangible assets that are treated as indefinite-lived intangible assets and therefore not subject to amortization until the completion or abandonment of the associated research and development efforts. If these efforts are abandoned in the future, the carrying value of the IPR&D asset will be expensed. If the research and development efforts are successfully completed, the IPR&D will be reclassified as a finite-lived asset and amortized over its useful life. No significant impairments were recorded in the years ended December 31, 2017 , 2016 and 2015 . Other Intangible Assets and Long-lived Assets: We account for long-lived assets (excluding indefinite-lived intangible assets) in accordance with the provisions of ASC 360. This statement requires that long-lived assets, which includes fixed assets and finite-lived intangible assets, be reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If an impairment test is warranted, recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to the sum of the undiscounted cash flows expected to result from the use and the eventual disposition of the asset. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount in which the carrying amount of the assets exceeds the fair value of the assets. Assets to be disposed of are reported at the lower of the carrying amount or fair value less costs to sell. Intangible assets (excluding indefinite-lived intangible assets) consist primarily of technology, customer lists and relationships, patents, and trade names. These assets are recorded at cost and usually amortized on a straight-line basis over their estimated lives. We assess useful lives based on the period over which the asset is expected to contribute to cash flows.
Revenue Recognition	Revenue Recognition: Product revenue is recognized once four criteria are met: 1) we have persuasive evidence that an arrangement exists; 2) delivery has occurred and title has passed to the customer, which generally happens at the point of shipment provided that no significant obligations remain; 3) the price is fixed and determinable; and 4) collectability is reasonably assured.
Research and Development	Research and Development: Research and development ("R&D") costs include expenditures for planned search and investigation aimed at discovery of new knowledge to be used to develop new products or processes or to significantly enhance existing products or production processes. R&D costs also include the implementation of new knowledge through design, testing of product alternatives, or construction of prototypes. We expense all R&D costs as incurred, net of customer reimbursements for sales of prototypes and non-recurring engineering charges. We create prototypes and tools related to R&D projects. A prototype is defined as a constructed product not intended for production resulting in a commercial sale. We also incur engineering costs related to R&D activities. Such costs are incurred to support such activities to improve the reliability, performance and cost-effectiveness of our existing products and to design and develop innovative products that meet customer requirements for new applications. Furthermore, we may engage in activities that develop tooling machinery and equipment for our customers.
Financial Instruments	Financial Instruments: We use forward contracts to mitigate currency risk related to forecasted foreign currency revenue and costs. These forward contracts are designed as cash flow hedges. At least quarterly, we assess the effectiveness of these hedging relationships based on the total change in their fair value using regression analysis. In addition, we use interest rate swaps to convert a portion of our revolving credit facility's variable rate of interest into a fixed rate. As a result of the use of these derivative instruments, the Company is exposed to the risk that counterparties to derivative contracts will fail to meet their contractual obligations. To mitigate the counterparty credit risk, the Company has a policy of only entering into contracts with carefully selected major financial institutions based upon their credit ratings and other factors and by using netting agreements. Our established policies and procedures for mitigating credit risk on principal transactions include reviewing and establishing limits for credit exposure and continually assessing the creditworthiness of counterparties. We estimate the fair value of our financial instruments as follows: Instrument Method for determining fair value Cash, cash equivalents, accounts receivable and accounts payable Cost, approximates fair value due to the short-term nature of these instruments. Revolving credit facility The fair value of long-term debt approximates carrying value and was determined by valuing a similar hypothetical coupon bond and attributing that value to our credit facility. Interest rate swaps and forward contracts The fair value of our interest rate swaps and forward contracts are measured using a market approach which uses current industry information.
Debt Issuance Costs	Debt Issuance Costs: We have debt issuance costs related to our long-term debt that are being amortized using the straight-line method over the life of the debt.
Equity-Based Compensation	Stock-Based Compensation: We recognize expense related to the fair value of stock-based compensation awards, consisting of restricted stock units ("RSUs"), cash-settled restricted stock units, and stock options, in the Consolidated Statements of Earnings. We estimate the fair value of stock option awards on the date of grant using the Black-Scholes option pricing model. A number of assumptions are used by the Black-Scholes option pricing model to compute the grant date fair value of an award, including expected price volatility, option term, risk-free interest rate, and dividend yield. These assumptions are established at each grant date based upon current information at that time. Expected volatilities are based on historical volatilities of CTS' common stock. The expected option term is derived from historical data of exercise behavior. Actual option terms can differ from the expected option terms as a result of different groups of employees exhibiting different exercise behavior. The dividend yield is based on historical dividend payments. The risk-free rate for periods within the contractual life of the option is based on the U.S. Treasury yield curve at the time of grant. The fair value of awards that are ultimately expected to vest is recognized as expense over the requisite service periods of the awards in the Consolidated Statements of Earnings. The grant date fair values of our service-based and performance-based RSUs are the closing price of our common stock on the date of grant. The grant date fair value of our market-based RSUs is determined by using a simulation, or Monte Carlo, approach. Under this approach, stock returns from a comparative group of companies are simulated over the performance period, considering both stock price volatility and the correlation of returns. The simulated results are then used to estimate the future payout based on the performance and payout relationship established by the conditions of the award. The future payout is discounted to the measurement date using the risk-free interest rate. Both our stock option and RSU awards primarily have a graded vesting schedule. We recognize expense on a straight-line basis over the requisite service period for each separately vesting portion of the award as if the award was, in substance, multiple awards. See NOTE 15, "Stock-Based Compensation" for further information. In 2016, we elected to early adopt the provisions of ASU 2016-09 "Compensation-Stock Compensation (Topic 718): Improvement to Employee Share based Payment Accounting" . Pursuant to this adoption, we recorded excess tax benefits within income tax expense for the year ended December 31, 2016, where previously these were recorded as increases or decreases to additional contributed capital. In addition, we have elected to account for forfeitures of awards as they occur. Both of these changes have been applied prospectively, and therefore no adjustments were made to prior periods. In accordance with the guidance, we retrospectively reported cash paid on behalf of employees for withholding shares for tax-withholding purposes as a financing activity in the Consolidated Statements of Cash Flows. Additionally, excess tax benefits were classified as an operating activity, applied prospectively. Adoption of this ASU did not result in a material change in our earnings, cash flows, or financial position.
Earnings Per Share	Earnings Per Share: Basic earnings per share excludes any dilution and is computed by dividing net earnings available to common shareholders by the weighted-average number of common shares outstanding for the period. Diluted earnings per share reflects the potential dilution that could occur if dilutive securities, such as stock options and unvested restricted stock units, were exercised or resulted in the issuance of common stock. Diluted earnings per share is calculated by adding all potentially dilutive shares to the weighted average number of common shares outstanding for the numerator. If the common stock equivalents have an anti-dilutive effect, they are excluded from the computation of diluted earnings per share.
Foreign Currencies	Foreign Currencies: The financial statements of our non-U.S. subsidiaries, except the United Kingdom ("U.K.") subsidiary, are remeasured into U.S. dollars using the U.S. dollar as the functional currency with all remeasurement adjustments included in the determination of net earnings. Foreign currency gains (losses) recorded in the Consolidated Statement of Earnings includes the following: Years Ended December 31, 2017 2016 2015 Foreign currency gains (losses) $ 3,052 $ (3,714 ) $ (6,299 ) The assets and liabilities of our U.K. subsidiary are translated into U.S. dollars at the current exchange rate at period end, with the resulting translation adjustments made directly to the "accumulated other comprehensive loss" component of shareholders' equity. Consolidated Statement of Earnings accounts are translated at the average rates during the period.
Shipping and Handling	Shipping and Handling: All fees billed to the customer for shipping and handling is classified as a component of net sales. All costs associated with shipping and handling is classified as a component of cost of goods sold.
Sales Tax	Sales Taxes: We classify sales taxes on a net basis in our consolidated financial statements.
Accounting Changes and Error Corrections [Text Block]	Change in Estimate: Beginning in January 2017, we changed the method we use to calculate the service and interest cost components of net periodic benefit cost for our U.S. pension and other post-retirement benefit plans. Previously, we calculated the service and interest cost components using a single weighted-average discount rate derived from the yield curve to measure the benefit obligation at the beginning of the period. In 2017, we began using a full yield curve approach in the estimation of these components of benefit cost by applying the specific spot-rates along the yield curve to the relevant projected cash flows. This approach better aligns each of the projected benefit cash flows to the corresponding spot rates on the yield curve, resulting in a more precise measurement of service and interest costs. The change in method resulted in a decrease in the service and interest components of pension costs in 2017. Any decrease to these components as a result of adoption of this approach is equally offset by a decrease in the actuarial losses included in our accumulated other comprehensive loss, with no impact on the measurement of the benefit obligation. This change is accounted for prospectively as a change in accounting estimate. Reclassifications: Certain reclassifications have been made to prior year amounts to conform to the current year presentation. The reclassifications had no impact on previously reported net earnings.
Reclassifications [Text Block]	Reclassifications: Certain reclassifications have been made to prior year amounts to conform to the current year presentation. The reclassifications had no impact on previously reported net earnings.
Recent Accounting Pronouncements	Recently Issued Accounting Pronouncements ASU 2017-12 "Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities" In August 2017, the Financial Accounting Standards Board ("FASB") issued Accountings Standards Update ("ASU") No 2017-12 "Derivatives and Hedging (Topic 815): Target Improvements to Accounting for Hedging Activities" . This ASU is meant to better align an entity's risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and presentation of the effects of the hedging instrument and the hedged item in the financial statements. This ASU is effective for annual periods beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted in any interim period after issuance. Any changes should be applied to all hedging relationships that exist at the date of adoption by applying a cumulative-effect adjustment related to eliminating the separate measurement of ineffectiveness to accumulated other comprehensive income with a corresponding adjustment to the opening balance of retained earnings as of the beginning of the fiscal year of adoption. Presentation and disclosure guidance is to be applied prospectively. We are still evaluating the impact this ASU may have on our financial statements. ASU 2017-07 "Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Post-retirement Benefit Cost" In March 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-07 "Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and net Periodic Post-retirement Benefit Cost" . This ASU is meant to improve the presentation of net periodic pension and net periodic post-retirement benefits costs. Currently, pension and post-retirement benefit costs are comprised of several components reflecting the different aspects of an employer's financial arrangements and cost of providing benefits to employees. These components are aggregated for reporting, but prior guidance does not prescribe where the net cost should be presented in the income statement or capitalized in assets. This ASU requires disaggregation of the service cost component from other components of net benefit cost and provides explicit guidance on how to present the service cost and other components in the income statement, allowing only the service cost component of net benefit costs to be eligible for capitalization. This ASU is effective for annual periods beginning after December 15, 2017, including interim periods within those periods. Early adoption is permitted as of the beginning of an annual period for which financial statements have not been issued or made available for issuance. These amendments should be applied retrospectively for the presentation of the service cost and other components of net periodic pension and net post-retirement benefit cost in the income statement and prospectively for the capitalization of the service cost and net periodic pension cost and periodic post-retirement benefit in assets. This ASU is not expected to have a material impact on our financial statements because the service cost component of our pension cost is expected to be immaterial to our financial results on a prospective basis. ASU 2017-04 "Intangibles -Goodwill and Other (Topic 305): Simplifying the Test for Goodwill Impairment" In January 2017, the FASB issued ASU No. 2017-04 "Intangibles - Goodwill and Other (Topic 305): Simplifying the Test for Goodwill Impairment" . This ASU is meant to simplify the subsequent measurement of goodwill for impairment by eliminating the current Step 2 analysis in computing the implied fair value of goodwill. In addition, this ASU requires an entity to consider income tax effects on any tax deductible goodwill on the carrying amount of the reporting unit when measuring an impairment loss, if applicable. Under this ASU, impairment is determined by comparing the reporting unit's fair value to the carrying value. This amendment is effective for fiscal years beginning after December 15, 2019, with early adoption permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. We do not expect this guidance to have an impact on our financial statements. ASU 2017-01 "Business Combinations (Topic 805): Clarifying the Definition of Business" In January 2017, the FASB issued ASU No. 2017-01 "Business Combinations (Topic 805): Clarifying the Definition of Business" . This ASU is meant to clarify the definition of a business to add guidance when determining when an acquisition or disposal should be accounted for as a sale or purchase of assets or a business. This ASU provides a more robust framework to use in determining when a set of assets or activities should be classified as a business, providing more consistency in accounting for business or asset acquisitions. This ASU is effective for public companies for fiscal years beginning after December 15, 2017, including interim periods within those periods. The ASU will be applied prospectively and it is not expected to have an impact on our financial statements. ASU 2016-16 "Income Taxes (Topic 740) Intra-Entity Transfers of Assets Other Than Inventory" In October 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-16, "Intra-Entity Transfers of Assets Other Than Inventory" . This ASU is meant to improve the accounting for the income tax effect of intra-entity transfers of assets other than inventory. Currently, U.S. GAAP prohibits the recognition of current and deferred income taxes for intra-entity asset transfers until the asset is sold to a third party. This ASU will now require companies to recognize the income tax effect of an intra-entity asset transfer (other than inventory) when the transaction occurs. This ASU is effective, for public companies for fiscal years beginning after December 15, 2019 and interim periods within those annual reporting periods. Early adoption is permitted and is to be applied on a modified retrospective bases through a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. This guidance is not expected to have a material impact on our consolidated financial statements. ASU 2016-15 "Statement of Cash Flows (Topic 230) Classification of Certain Cash Receipts and Cash Payments" In August 2016, the FASB issued ASU No. 2016-15, "Classification of Certain Cash Receipts and Cash Payments". This ASU reduces the diversity in reporting of eight specific cash flow issues due to accounting guidance that is unclear or does not exist. The eight issues relate to certain debt activities, business combination activities, insurance settlements and other various activities. This guidance is effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years. Early adoption is permitted and is to be applied retrospectively using a transition method for each period presented. An entity that elects early adoption of the amendment under this ASU must adopt all aspects of the amendment in the same period. This guidance is not expected to have a material impact on our consolidated financial statements. ASU 2016-02 "Leases (Topic 842)" In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)". This amendment created a new Topic under the accounting standards codification to account for the provisions of the ASU. This amendment is meant to provide transparency and to improve comparability between entities. The ASU requires companies to record an asset and liability on the balance sheet for leases that were formerly designated as operating leases as well as leases designated as financing leases. The provisions of the ASU predominately change the recognition of leases for lessees; the provisions do not substantially change the accounting for lessors. This ASU will supersede the provisions of Topic 840 Leases. The liability recorded for a lease is meant to recognize the lease payments and the asset as a right to use the underlying asset for the lease, including optional periods if it is reasonably certain the option will be exercised. Recording of the liability should be based on the present value of the lease payments. If a lease term is less than twelve months, a company is allowed to elect not to record the asset and liability. Expense related to these leases are to be amortized straight-line over the term of the lease. Additionally, the provisions of this ASU provide additional guidance on separating lease terms from maintenance and other type of provisions that provide a good or service, accounting for sale-leaseback provisions, and leveraged leases. Reporting in the cash flow statement remains virtually unchanged. Additional qualitative and quantitative disclosures are required. These updates are required to be applied under a modified retrospective approach from the beginning of the earlier period presented. The modified approach provides optional practical expedients that may be elected, which will allow companies to continue to account for leases under the previous guidance for leases that commenced prior to the effective date. The provisions of this ASU are effective for fiscal years beginning after December 15, 2018, and interim periods within those periods. Early adoption is allowed. The provisions of this guidance are still being evaluated and the impact on our financial statements has not yet been determined. ASU 2014-09 , "Revenue from Contracts with Customers (Topic 606)" In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers (Topic 606)", which supersedes the revenue recognition requirements in Accounting Standards Codification (ASC) 605, Revenue Recognition effective January 1, 2018. Several additional ASUs have subsequently been issued amending and clarifying the standard. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance provides a five-step process to achieve that core principle. We adopted this standard on January 1, 2018 using the modified retrospective approach, which requires a cumulative effect adjustment to the opening balance of retained earnings on the date of adoption. We have completed our review of customer contracts and agreements for revenue recognized in 2017. We have assessed the impact of the new standard on our existing revenue recognition policies and have concluded that the standard will not have a material impact on our financial position or results of operations. We will include the additional required disclosures beginning with our Form 10-Q for the first quarter of 2018.
Subsequent Events	Subsequent Events: We have evaluated subsequent events and transactions for potential recognition or disclosure in the financial statements through the date the financial statements are issued

Summary of Significant Accoun30

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2017
Summary of net sales to significant customers as a percentage of total net sales	Our net sales to significant customers as a percentage of total net sales were as follows: Years Ended December 31, 2017 2016 2015 Cummins Inc. 13.4% 9.9% 9.3% Honda Motor Co. 11.2% 10.7% 10.7% Toyota Motor Corporation 10.2% 10.4% 10.1% We sell automotive parts to these three customers for certain vehicle platforms under purchase agreements that have no volume commitments and are subject to purchase orders issued from time to time. No other customer accounted for 10% or more of total net sales during these periods.
Summary of Molds, Dies and Other Tools	Costs of molds, dies and other tools used to make products sold for which we have a contractual guarantee for lump sum reimbursement from the customer are included in other current assets on the Consolidated Balance Sheets until reimbursement is received from the customer. A summary of amounts to be received from customers is as follows: December 31, 2017 2016 Cost of molds, dies and other tools included in other current assets $ 3,382 $ 2,837
Summary of customer reimbursement receivable	Reimbursements received from customers are netted against such costs and included in our Consolidated Statements of Earnings if the amount received is in excess of the costs that we incur. A summary of amounts received from customers is as follows: Years Ended December 31, 2017 2016 2015 Reimbursements received from customers $ 4,299 $ 2,036 $ 1,861
Fair Value Measurements, Recurring and Nonrecurring	We estimate the fair value of our financial instruments as follows: Instrument Method for determining fair value Cash, cash equivalents, accounts receivable and accounts payable Cost, approximates fair value due to the short-term nature of these instruments. Revolving credit facility The fair value of long-term debt approximates carrying value and was determined by valuing a similar hypothetical coupon bond and attributing that value to our credit facility. Interest rate swaps and forward contracts The fair value of our interest rate swaps and forward contracts are measured using a market approach which uses current industry information.
Summary of foreign currency gain (loss) recorded in the statement of operations	Foreign currency gains (losses) recorded in the Consolidated Statement of Earnings includes the following: Years Ended December 31, 2017 2016 2015 Foreign currency gains (losses) $ 3,052 $ (3,714 ) $ (6,299 )
Options
Summary of antidilutive stock options	Our antidilutive stock options and RSUs consist of the following: Years Ended December 31, (units) 2017 2016 2015 Antidilutive stock options and RSUs 22,110 35,189 13,979

Accounts Receivable (Tables)

Accounts Receivable (Tables)	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Components of Accounts Receivable	The components of accounts receivable are as follows: As of December 31, 2017 2016 Accounts receivable, gross $ 70,941 $ 62,782 Less: Allowance for doubtful accounts (357 ) (170 ) Accounts receivable, net $ 70,584 $ 62,612

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Summary of Inventories	Inventories consist of the following: As of December 31, 2017 2016 Finished goods $ 9,203 $ 7,513 Work-in-process 12,065 9,596 Raw materials 21,150 17,680 Less: Inventory reserves (5,822 ) (6,137 ) Inventories, net $ 36,596 $ 28,652

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Summary of Property, Plant and Equipment Assets	Property, plant and equipment is comprised of the following: As of December 31, 2017 2016 Land $ 1,130 $ 2,330 Buildings and improvements 64,201 63,621 Machinery and equipment 223,650 213,198 Less: Accumulated depreciation (200,734 ) (197,038 ) Property, plant and equipment, net $ 88,247 $ 82,111
Summary of Depreciation Expense	Depreciation expense recorded in the Consolidated Statements of Earnings includes the following: For the Years Ended 2017 2016 2015 Depreciation expense $ 14,071 $ 13,177 $ 12,219

Retirement Plans (Tables)

Retirement Plans (Tables)	12 Months Ended
	Dec. 31, 2017
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Reconciliation of Benefit Obligation, Plan Assets, and Funded Status	The following table provides a reconciliation of benefit obligation, plan assets, and the funded status of the pension plans for U.S. and non-U.S. locations at the measurement dates. U.S. Pension Plans Non-U.S. Pension Plans 2017 2016 2017 2016 Accumulated benefit obligation $ 228,934 $ 247,276 $ 2,535 $ 2,295 Change in projected benefit obligation: Projected benefit obligation at January 1 $ 247,276 $ 256,924 $ 2,866 $ 2,796 Service cost — 87 48 51 Interest cost 8,273 11,024 34 46 Benefits paid (39,177 ) (20,537 ) (210 ) (289 ) Actuarial loss (gain) 12,562 (222 ) 164 229 Foreign exchange impact — — 238 33 Projected benefit obligation at December 31 $ 228,934 $ 247,276 $ 3,140 $ 2,866 Change in plan assets: Assets at fair value at January 1 $ 292,044 $ 289,315 $ 1,523 $ 1,480 Actual return on assets 31,559 23,163 17 11 Company contributions 336 103 319 303 Benefits paid (39,177 ) (20,537 ) (210 ) (289 ) Foreign exchange impact — — 128 18 Assets at fair value at December 31 $ 284,762 $ 292,044 $ 1,777 $ 1,523 Funded status (plan assets less projected benefit obligations) $ 55,828 $ 44,768 $ (1,363 ) $ (1,343 ) The measurement dates for the post-retirement life insurance plan were December 31, 2017 , and 2016 . The following table provides a reconciliation of benefit obligation, plan assets, and the funded status of the post-retirement life insurance plan at those measurement dates. Post-Retirement 2017 2016 Accumulated benefit obligation $ 5,134 $ 4,952 Change in projected benefit obligation: Projected benefit obligation at January 1 $ 4,952 $ 4,886 Service cost 2 3 Interest cost 161 207 Benefits paid (165 ) (165 ) Actuarial loss 184 21 Projected benefit obligation at December 31 $ 5,134 $ 4,952 Change in plan assets: Assets at fair value at January 1 $ — $ — Actual return on assets — — Company contributions 165 165 Benefits paid (165 ) (165 ) Other — — Assets at fair value at December 31 $ — $ — Funded status (plan assets less projected benefit obligations) $ (5,134 ) $ (4,952 )
Components of Prepaid (Accrued) Cost	The components of the prepaid (accrued) cost of the domestic and foreign pension plans are classified in the following lines in the Consolidated Balance Sheets at December 31: U.S.Pension Plans Non-U.S. Pension Plans 2017 2016 2017 2016 Prepaid pension asset $ 57,050 $ 46,183 $ — $ — Accrued expenses and other liabilities (100 ) (317 ) — — Long-term pension obligations (1,122 ) (1,098 ) (1,363 ) (1,343 ) Net prepaid (accrued) cost $ 55,828 $ 44,768 $ (1,363 ) $ (1,343 ) The components of the accrued cost of the post-retirement life insurance plan are classified in the following lines in the Consolidated Balance Sheets at December 31: Post-Retirement 2017 2016 Accrued expenses and other liabilities $ (418 ) $ (387 ) Long-term pension obligations (4,716 ) (4,565 ) Total accrued cost $ (5,134 ) $ (4,952 )
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]	We have also recorded the following amounts to accumulated other comprehensive loss for the U.S. and non-U.S. pension plans, net of tax: U.S.Pension Plans Non-U.S. Pension Plans Unrecognized Prior Total Unrecognized Balance at January 1, 2016 $ 96,388 $ — $ 96,388 $ 1,639 Amortization of retirement benefits, net of tax (3,817 ) — (3,817 ) 85 Net actuarial (loss) gain (2,808 ) — (2,808 ) 12 Foreign exchange impact — — — 7 Balance at January 1, 2017 $ 89,763 $ — $ 89,763 $ 1,743 Amortization of retirement benefits, net of tax (3,685 ) — (3,685 ) 10 Settlements (8,585 ) — (8,585 ) — Net actuarial (loss) gain (1,753 ) — (1,753 ) 2 Foreign exchange impact — — — 143 Balance at December 31, 2017 $ 75,740 $ — $ 75,740 $ 1,898 We have recorded the following amounts to accumulated other comprehensive loss for the post-retirement life insurance plan, net of tax: Unrecognized Balance at January 1, 2016 $ (669 ) Amortization of retirement benefits, net of tax 95 Net actuarial gain 14 Balance at January 1, 2017 $ (560 ) Amortization of retirement benefits, net of tax 64 Net actuarial gain 117 Balance at December 31, 2017 $ (379 )
Projected Benefit Obligation Accumulated Benefit Obligation and Fair Value of Plan Assets	The projected benefit obligation, accumulated benefit obligation and fair value of plan assets for those Pension Plans with accumulated benefit obligation in excess of fair value of plan assets is shown below: As of December 31, 2017 2016 Projected benefit obligation $ 4,361 $ 4,281 Accumulated benefit obligation 3,757 3,710 Fair value of plan assets 1,776 1,523
Net Pension Income or Postretirement Expense	Net pension (income) expense includes the following components: Years Ended Years Ended U.S. Pension Plans Non-U.S. Pension Plans 2017 2016 2015 2017 2016 2015 Service cost $ — $ 87 $ 171 $ 48 $ 51 $ 63 Interest cost 8,273 11,024 11,258 34 46 465 Expected return on plan assets (1) (16,243 ) (18,976 ) (20,272 ) (20 ) (26 ) (446 ) Amortization of unrecognized loss 5,785 5,994 6,339 155 140 7,492 Additional cost due to early retirement — — — — — 651 Settlement loss 13,476 — — — — — Net expense (income) $ 11,291 $ (1,871 ) $ (2,504 ) $ 217 $ 211 $ 8,225 Weighted-average actuarial assumptions (2) Benefit obligation assumptions: Discount rate 3.63 % 4.16 % 4.43 % 1.38 % 1.13 % 1.63 % Rate of compensation increase 0.00 % 0.00 % 0.00 % 2.00 % 2.00 % 2.00 % Pension income/expense assumptions: Discount rate 4.16 % 4.43 % 4.07 % 1.13 % 1.63 % 3.13 % Expected return on plan assets (1) 5.61 % 6.63 % 7.00 % 1.13 % 1.63 % 2.00 % Rate of compensation increase 0.00 % 0.00 % 0.00 % 2.00 % 2.00 % 0.48 % (1) Expected return on plan assets is net of expected investment expenses and certain administrative expenses. (2) During the fourth quarter of each year, we review our actuarial assumptions in light of current economic factors to determine if the assumptions need to be adjusted. Net post-retirement expense includes the following components: Post-Retirement Years Ended December 31, 2017 2016 2015 Service cost $ 2 $ 3 $ 5 Interest cost 161 207 204 Amortization of unrecognized gain (101 ) (149 ) (101 ) Net expense $ 62 $ 61 $ 108 Weighted-average actuarial assumptions (1) Benefit obligation assumptions: Discount rate 3.59 % 4.10 % 4.43 % Rate of compensation increase 0 % 0 % 0 % Pension income/post-retirement expense assumptions: Discount rate 4.10 % 4.43 % 4.07 % Rate of compensation increase 0 % 0 % 0 % (1) During the fourth quarter of each year, we review our actuarial assumptions in light of current economic factors to determine if the assumptions need to be adjusted.
Asset Allocation and Target Allocation Plan	Our pension plan asset allocation at December 31, 2017 , and 2016 , and target allocation for 2018 by asset category are as follows: Target Allocations Percentage of Plan Assets Asset Category 2018 2017 2016 Equity securities (1) 13% 11% 25% Debt securities 83% 82% 59% Other 4% 7% 16% Total 100% 100% 100% (1) Equity securities include CTS common stock in the amount of $ 0 at December 31, 2017 and approximately $17,700 ( 6% of total plan assets) at December 31, 2016 .
Summary of Fair Values of Pension Plan	The following table summarizes the fair values of our pension plan assets: As of December 31, 2017 2016 Equity securities - U.S. holdings (1) $ 19,487 $ 43,708 Equity securities - non-U.S. holdings (1) 1,131 819 Equity funds - U.S. holdings (1) 1,314 28,052 Bond funds - government (5) 3,126 22,237 Bond funds - other (6) 231,710 150,712 Real estate (7) 1,235 3,812 Cash and cash equivalents (2) 11,145 7,823 Partnerships (4) 10,787 12,862 International hedge funds (3) 6,604 23,542 Total fair value of plan assets $ 286,539 $ 293,567
Summary of Categories in Fair Value Hierarchy	The fair values at December 31, 2017 , are classified within the following categories in the fair value hierarchy: Quoted Prices Significant Significant Not Leveled Total Equity securities - U.S. holdings (1) $ 19,487 $ — $ — $ — $ 19,487 Equity securities - non-U.S. holdings (1) 1,131 — — — 1,131 Equity funds - U.S. holdings (1) — 1,314 — — 1,314 Bond funds - government (5) — 3,126 — — 3,126 Bond funds - other (6) — 231,710 — — 231,710 Real estate (7) (8) — — — 1,235 1,235 Cash and cash equivalents (2) 11,145 — — — 11,145 Partnerships (4) — — 10,787 — 10,787 International hedge funds (3) (8) — — — 6,604 6,604 Total $ 31,763 $ 236,150 $ 10,787 $ 7,839 $ 286,539 The fair values at December 31, 2016 , are classified within the following categories in the fair value hierarchy: Quoted Prices Significant Significant Not Leveled Total Equity securities - U.S. holdings (1) $ 43,708 $ — $ — $ — $ 43,708 Equity securities - non-U.S. holdings (1) 819 — — — 819 Equity funds - U.S.holdings (1) — 28,052 — — 28,052 Bond funds - government (5) — 22,237 — — 22,237 Bond funds - other (6) — 150,712 — — 150,712 Real estate (7) (8) — — — 3,812 3,812 Cash and cash equivalents (2) 7,823 — — — 7,823 Partnerships (4) — — 12,862 — 12,862 International hedge funds (3) (8) — — — 23,542 23,542 Total $ 52,350 $ 201,001 $ 12,862 $ 27,354 $ 293,567 (1) Comprised of common stocks of companies in various industries. The Pension Plan fund manager may shift investments from value to growth strategies or vice-versa, from small cap to large cap stocks or vice-versa, in order to meet the Pension Plan's investment objectives, which are to provide for a reasonable amount of long-term growth of capital without undue exposure to volatility, and protect the assets from erosion of purchasing power. (2) Comprised of investment grade short-term investment and money-market funds. (3) This fund allocates its capital across several direct hedge-fund organizations. This fund invests with hedge funds that employ "non-directional" strategies. These strategies do not require the direction of the markets to generate returns. The majority of these hedge funds generate returns by the occurrence of key events such as bankruptcies, mergers, spin-offs, etc. Investments can be redeemed at the Share Net Asset Value ("NAV") as of the last business day of each calendar quarter with at least a sixty-five day prior written notice to the administrator. (4) Comprised of partnerships that invest in various U.S. and international industries. (5) Comprised of long-term government bonds with a minimum maturity of 10 years and zero-coupon Treasury securities ("Treasury Strips") with maturities greater than 20 years. (6) Comprised predominately of investment grade U.S. corporate bonds with maturities greater than 10 years and U.S. high-yield corporate bonds; emerging market debt (local currency sovereign bonds, U.S. dollar-denominated sovereign bonds and U.S. dollar-denominated corporate bonds); and U.S. bank loans. (7) Comprised of investments in securities of U.S. and non-U.S. real estate investment trusts (REITs), real estate operating companies and other companies that are principally engaged in the real estate industry and of investments in global private direct commercial real estate. Investments can be redeemed immediately following the valuation date with a notice of at least fifteen business days before valuation. (8) Comprised of investments that are measured at fair value using the NAV per share practical expedient. In accordance with the provisions of ASC 820-10, these investments have not been classified in the fair value hierarchy. The fair value amount not leveled is presented to allow reconciliation of the fair value hierarchy to total fund pension plan assets.
Estimated Future Benefit Payments	The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid: U.S. Non-U.S. Post-Retirement 2018 $ 15,693 $ 67 $ 418 2019 15,705 72 405 2020 15,673 242 392 2021 15,548 63 378 2022 15,361 69 363 2023-2026 72,669 532 1,610 Total $ 150,649 $ 1,045 $ 3,566
Summary of 401K and Other Plan Expense	Expenses related to defined contribution plans include the following: Years Ended December 31, 2017 2016 2015 401(k) and other plan expense $ 3,141 $ 2,841 $ 3,352
Partnership
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Reconciliation of Level 3 Hedge Fund Asset Within Fair Value Hierarchy	The table below reconciles the Level 3 partnership assets within the fair value hierarchy: Amount Fair value of Level 3 partnership assets at January 1, 2016 $ 13,360 Capital contributions 1,419 Realized and unrealized gain 584 Capital distributions (2,501 ) Fair value of Level 3 partnership assets at December 31, 2016 12,862 Capital contributions 343 Realized and unrealized gain 2,107 Capital distributions (4,525 ) Fair value of Level 3 partnership assets at December 31, 2017 $ 10,787

Goodwill and Other Intangible35

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets	Other intangible assets consist of the following: As of December 31, 2017 Gross Accumulated Net Weighted Average Remaining Amortization Period (in years) Other intangible assets: Customer lists / relationships $ 64,323 $ (33,685 ) $ 30,638 10.5 Patents 10,319 (10,319 ) — — Technology and other intangibles 44,460 (10,355 ) 34,105 8.3 In process research and development 2,200 — 2,200 — Other intangible assets, net $ 121,302 $ (54,359 ) $ 66,943 10.5 Amortization expense for the year ended December 31, 2017 $ 6,603	As of December 31, 2016 Gross Accumulated Net Other intangible assets: Customer lists / relationships $ 63,386 $ (30,318 ) $ 33,068 Patents 10,319 (10,319 ) — Technology and other intangibles 36,715 (7,613 ) 29,102 In process research and development 2,200 — 2,200 Other intangible assets, net $ 112,620 $ (48,250 ) $ 64,370 Amortization expense for the year ended December 31, 2016 $ 5,815 Amortization expense for the year ended December 31, 2015 $ 4,035
Summary of Amortization Expense	Amortization expense remaining for other intangible assets is as follows: Amortization 2018 $ 6,763 2019 6,754 2020 6,624 2021 6,467 2022 6,230 Thereafter 34,105 Total future amortization expense $ 66,943
Summary of Reconciliation of Goodwill	Changes in the net carrying value amount of goodwill were as follows: Total Goodwill as of December 31, 2015 $ 33,865 Increase from acquisitions 27,879 Goodwill as of December 31, 2016 61,744 Increase from acquisition 9,313 Goodwill as of December 31, 2017 $ 71,057

Costs Associated with Exit an36

Costs Associated with Exit and Restructuring Activities (Tables)	12 Months Ended
	Dec. 31, 2017
Restructuring Reserve Activity	The following table displays the restructuring liability activity for the year ended December 31, 2017 : June 2013 Plan and April 2014 Plan and June 2016 Plan Restructuring Liability Restructuring liability at January 1, 2017 $ 2,162 Restructuring charges 4,139 Cost paid (4,445 ) Other activities (1) 57 Restructuring liability at December 31, 2017 $ 1,913
June 2013 Plan April 2014 Plan and June 2016 Plan
Restructuring and Restructuring Related Charges of Actual Costs	Restructuring and impairment charges are reported as a separate line within operating earnings in the Consolidated Statements of Earnings. Restructuring-related charges are recorded as a component of cost of goods sold. Total restructuring, impairment and restructuring-related charges were: Years Ended December 31, 2017 2016 2015 Restructuring-related charges $ — $ — $ 631 Restructuring and impairment charges 4,139 3,048 14,564 Total restructuring, impairment, and restructuring-related charges $ 4,139 $ 3,048 $ 15,195
June2016 Plan
Restructuring and Restructuring Related Charges of Actual Costs	The following table displays the planned restructuring and impairment charges associated with the June 2016 Plan as well as a summary of the actual costs incurred through December 31, 2017 : June 2016 Plan Planned Costs Actual costs Workforce reduction $ 3,075 $ 2,927 Building and equipment relocation 9,025 3,574 Other charges 1,300 686 Restructuring and impairment charges $ 13,400 $ 7,187 Total restructuring and impairment charges for the June 2016 Plan were as follows: Years Ended December 31, 2017 2016 Restructuring and impairment charges $ 4,139 $ 3,048
April 2014 Plan
Restructuring and Restructuring Related Charges of Actual Costs	The following table displays the planned restructuring and restructuring-related charges associated with the April 2014 Plan, as well as a summary of the actual costs incurred through December 31, 2017 : April 2014 Plan Planned Actual costs Inventory write-down $ 850 $ — Equipment relocation 1,800 444 Other charges 1,400 113 Restructuring-related charges, included in cost of goods sold 4,050 557 Workforce reduction 4,200 4,423 Other charges, including pension termination costs 1,700 3,413 Restructuring and impairment charges 5,900 7,836 Total restructuring, impairment and restructuring-related charges $ 9,950 $ 8,393
June 2013 Plan
Restructuring and Restructuring Related Charges of Actual Costs	The following table displays the planned restructuring and restructuring-related charges associated with the June 2013 Plan, as well as a summary of the actual costs incurred through completion of the plan as of December 31, 2015: June 2013 Plan Planned Actual costs Inventory write-down $ 800 $ 1,143 Equipment relocation 900 1,792 Other charges 100 702 Restructuring-related charges, included in cost of goods sold 1,800 3,637 Workforce reduction 10,150 9,615 Asset impairment charge 3,000 4,139 Other charges, including pension termination costs 7,650 10,205 Restructuring and impairment charges 20,800 23,959 Total restructuring and restructuring-related charges $ 22,600 $ 27,596

Accrued Liabilities and Other37

Accrued Liabilities and Other Liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Payables and Accruals [Abstract]
Components of Accrued Liabilities	The components of accrued expenses and other liabilities are as follows: As of December 31, 2017 2016 Accrued product-related costs $ 5,297 $ 5,556 Accrued income taxes 5,475 9,826 Accrued property and other taxes 997 1,917 Dividends payable 1,318 1,309 Remediation reserves 17,067 18,176 Other accrued liabilities 11,190 8,924 Total accrued expenses and other liabilities $ 41,344 $ 45,708

Contingencies (Tables)

Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Summary of Remediation Reserve Activity	A roll forward of remediation reserves on the balance sheet is comprised of the following: Years Ended December 31, 2017 2016 2015 Balance at beginning of period $ 18,176 $ 20,603 $ 3,918 Remediation expense 307 556 18,591 Remediation payments (1,416 ) (2,983 ) (1,906 ) Balance at end of the period $ 17,067 $ 18,176 $ 20,603

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2017
Leases [Abstract]
Schedule of future minimum non-cancelable operating lease payments	Minimum future obligations under all non-cancelable operating leases as of December 31, 2017 , are as follows: Operating Leases 2018 $ 3,631 2019 2,887 2020 1,722 2021 996 2022 954 Thereafter 11,161 Total minimum lease obligations $ 21,351
Summary of operating lease rent expense	Rent expense for operating leases charged to operations was as follows: Years Ended December 31, 2017 2016 2015 Rent expense $ 4,762 $ 5,694 $ 3,550

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Summary of Long-Term Debt	Long-term debt was comprised of the following: As of December 31 2017 2016 Total credit facility $ 300,000 $ 300,000 Balance outstanding $ 76,300 $ 89,100 Standby letters of credit $ 2,065 $ 2,165 Amount available $ 221,635 $ 208,735 Weighted-average interest rate 2.30 % 1.90 % Commitment fee percentage per annum 0.25 % 0.25 %
Summary of Interest Rate Swaps Activity Recorded in Other Comprehensive Income Before Tax	Interest rate swaps activity recorded in other comprehensive earnings before tax included the following: Years Ended December 31, 2017 2016 2015 Unrealized (loss) gain $ (255 ) $ 593 $ (516 ) Realized gain reclassified to interest expense $ 37 $ 928 $ 768

Derivatives Derivative Financ41

Derivatives Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	The location and fair values of derivative instruments designated as hedging instruments in the Consolidated Balance Sheets as of December 31, 2017 , are shown in the following table: As of December 31, 2017 2016 Foreign currency hedges reported in Accrued expenses and other liabilities $ 742 $ 601 Interest rate swaps reported in Other current assets $ 278 $ 2 Interest rate swaps reported in Other assets $ 693 $ 751
Derivative Financial Instruments	Derivatives Our earnings and cash flows are subject to fluctuations due to changes in foreign currency exchange rates and interest rates. We selectively use derivative financial instruments including foreign currency forward contracts and interest rate swaps to manage our exposure to these risks. The use of derivative financial instruments exposes the Company to credit risk, which relates to the risk of nonperformance by a counterparty to the derivative contracts. We manage our credit risk by entering into derivative contracts with only highly rated financial institutions and by using netting agreements. Foreign Currency Hedges In January of 2016, we began using forward contracts to mitigate currency risk related to a portion of our forecasted foreign Euro denominated revenues and Mexican Peso denominated expenses. The currency forward contracts are designed as cash flow hedges and are recorded in the Consolidated Balance Sheets at fair value. At least quarterly, we assess the effectiveness of these hedging relationships based on the total change in their fair value using regression analysis. The effective portion of derivative gains and losses are recorded in accumulated other comprehensive loss until the hedged transaction affects earnings upon settlement, at which time they are reclassified to net sales and cost of goods sold. Ineffectiveness is recorded in other income (expense) in our Consolidated Statements of Earnings. If it becomes probable that an anticipated transaction that is hedged will not occur by the end of the originally specified time period, we reclassify the gains or losses related to that hedge from accumulated other comprehensive loss to other income (expense). As of December 31, 2017 , we were hedging a portion of our forecasted Peso expenses and Euro denominated revenue for the following twelve months. We continue to monitor the Company’s overall currency exposure and may elect to add cash flow hedges in the future. At December 31, 2017 , we had a net unrealized loss of $ 683 in accumulated other comprehensive loss, of which $ 567 is expected to be reclassified to income within the next 12 months. The notional amount of foreign currency forward contracts outstanding was $ 33.2 million at December 31, 2017 . Interest Rate Swaps We use interest rate swaps to convert the revolving credit facility’s variable rate of interest into a fixed rate on a portion of our debt balance. In the second quarter of 2012, we entered into four separate one-year interest rate swap agreements to fix interest rates on $50,000 of long-term debt for the periods January 2013 to January 2017. In the third quarter of 2012, we entered into four additional one-year interest rate swap agreements to fix interest rates on $25,000 of long-term debt for the periods January 2013 to January 2017. In the third quarter of 2016, we entered into three additional one-year interest rate swap agreements to fix interest rates on $50,000 of long-term debt for the periods August 2017 to August 2020. The difference to be paid or received under the terms of the swap agreements will be recognized as an adjustment to interest expense when settled. These swaps are treated as cash flow hedges and consequently, the changes in fair value were recorded in other comprehensive income (loss). The estimated net amount of the existing gains or losses that are reported in accumulated other comprehensive income (loss) that is expected to be reclassified into earnings within the next twelve months is approximately $ 278 . The location and fair values of derivative instruments designated as hedging instruments in the Consolidated Balance Sheets as of December 31, 2017 , are shown in the following table: As of December 31, 2017 2016 Foreign currency hedges reported in Accrued expenses and other liabilities $ 742 $ 601 Interest rate swaps reported in Other current assets $ 278 $ 2 Interest rate swaps reported in Other assets $ 693 $ 751 The Company has elected to net its foreign currency derivative assets and liabilities in the balance sheet in accordance with ASC 210-20 (Balance Sheet, Offsetting). On a gross basis, there were $ 97 foreign currency derivative assets and foreign currency derivative liabilities were $ 839 . The effect of derivative instruments on the Consolidated Statements of Earnings is as follows: Years Ended December 31, 2017 2016 2015 Foreign Exchange Contracts: Amounts reclassified from AOCI to earnings Net sales $ (488 ) $ (124 ) $ — Cost of goods sold 497 111 — Selling, general and administrative 45 1 — Total amounts reclassified from AOCI to earnings 54 (12 ) — Loss recognized in other expense for hedge ineffectiveness (1 ) (1 ) — Loss recognized in other expense for derivatives not designated as cash flow hedges (15 ) (5 ) — Total derivative gain (loss) on foreign exchange contracts recognized in earnings 38 (18 ) — Interest Rate Swaps: Interest Expense $ (37 ) $ (928 ) $ (768 ) Total income (loss) on derivatives recognized in earnings $ 1 $ (946 ) $ (768 ) The table below provides a reconciliation of the recurring financial assets and liabilities related to interest rate swaps and foreign currency hedges: Interest Rate Foreign Currency Hedges Balance at January 1, 2016 $ (768 ) $ — Settled in cash — 54 Total gains (losses) for the period: Included in earnings 928 (18 ) Included in other comprehensive earnings (loss) 593 (637 ) Balance at January 1, 2017 $ 753 $ (601 ) Settled in cash — (132 ) Total gains (losses) for the period: Included in earnings — 38 Included in other comprehensive earnings (loss) 218 (47 ) Balance at December 31, 2017 $ 971 $ (742 )

Accumulated Other Comprehensi42

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Changes in Accumulated Other Comprehensive Earnings/(Loss)	The components of AOCI for 2017 are as follows: As of December 31, 2016 Gain (Loss) Gain (Loss) As of December 31, 2017 Changes in fair market value of hedges: Gross $ 116 $ 264 $ (91 ) $ 289 Income tax expense (benefit) (42 ) (96 ) 33 (105 ) Net 74 168 (58 ) 184 Changes in unrealized pension cost: Gross (151,618 ) — 21,522 (130,096 ) Income tax expense (benefit) 60,672 — (7,835 ) 52,837 Net (90,946 ) — 13,687 (77,259 ) Cumulative translation adjustment: Gross (2,414 ) 429 — (1,985 ) Income tax expense (benefit) 92 8 — 100 Net (2,322 ) 437 — (1,885 ) Total accumulated other comprehensive (loss) income $ (93,194 ) $ 605 $ 13,629 $ (78,960 ) The components of AOCI for 2016 are as follows: As of December 31, 2015 (Loss) Gain Gain (Loss) As of December 31, 2016 Changes in fair market value of hedges: Gross $ (768 ) $ (56 ) $ 940 $ 116 Income tax expense (benefit) 289 20 (351 ) (42 ) Net (479 ) (36 ) 589 74 Changes in unrealized pension cost: Gross (161,719 ) — 10,101 (151,618 ) Income tax expense (benefit) 64,361 — (3,689 ) 60,672 Net (97,358 ) — 6,412 (90,946 ) Cumulative translation adjustment: Gross (1,279 ) (1,135 ) — (2,414 ) Income tax expense (benefit) 111 (19 ) — 92 Net (1,168 ) (1,154 ) — (2,322 ) Total accumulated other comprehensive (loss) income $ (99,005 ) $ (1,190 ) $ 7,001 $ (93,194 )

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2017
Stockholders' Equity Note [Abstract]
Summary of Share Count and Par Value Data Related to Shareholders' Equity	Share count and par value data related to shareholders' equity are as follows: As of December 31, 2017 2016 Preferred Stock Par value per share No par value No par value Shares authorized 25,000,000 25,000,000 Shares outstanding — — Common Stock Par value per share No par value No par value Shares authorized 75,000,000 75,000,000 Shares issued 56,632,488 56,456,516 Shares outstanding 32,938,466 32,762,494 Treasury stock Shares held 23,694,022 23,694,022
Summary of Common Shares Outstanding	A roll forward of common shares outstanding is as follows: As of December 31, 2017 2016 Balance at beginning of the year 32,762,494 32,548,477 Restricted stock unit issuances 175,972 214,017 Balance at end of period 32,938,466 32,762,494

Equity-Based compensation (Tabl

Equity-Based compensation (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Equity-Based Compensation Expense	The following table summarizes the compensation expense included in selling, general and administrative expenses in the Consolidated Statements of Earnings related to stock-based compensation plans: Years Ended December 31, 2017 2016 2015 Service-Based RSUs $ 1,762 $ 1,997 $ 1,944 Performance-Based RSUs 2,350 665 1,235 Cash-settled awards 72 76 16 Total $ 4,184 $ 2,738 $ 3,195 Income tax benefit 1,573 1,029 1,201 Net $ 2,611 $ 1,709 $ 1,994
Schedule of Unrecognized Equity-Based Compensation Expense	The following table summarizes the unrecognized compensation expense related to non-vested RSUs by type and the weighted-average period in which the expense is to be recognized: Unrecognized Weighted- Service-Based RSUs $ 1,079 1.11 years Performance-Based RSUs 2,313 1.62 years Total $ 3,392 1.46 years
Summary of Status of Equity-Based Compensation Plans	The following table summarizes the status of these plans as of December 31, 2017 : 2014 Plan 2009 Plan 2004 Plan Directors' Plan Awards originally available to be granted 1,500,000 3,400,000 6,500,000 N/A Performance stock options outstanding 295,000 — — — Maximum potential RSU and cash settled awards outstanding 725,759 122,600 57,391 9,620 Maximum potential awards outstanding 1,020,759 122,600 57,391 9,620 RSUs and cash settled awards vested and released 176,221 — — — Awards available to be granted 303,020 — — —
Summary of Service-Based Restricted Stock Units	A summary of RSUs for all Plans is presented below: Units Weighted Weighted Aggregate Outstanding at January 1, 2017 554,478 $ 13.37 Granted 57,740 24.32 Released (201,918 ) 13.85 Forfeited (10,953 ) 17.11 Outstanding at December 31, 2017 399,347 $ 14.60 24.58 $ 10,283 Releasable at December 31, 2017 259,811 $ 12.48 33.88 $ 6,690
Schedule of Weighted Average Grant Date Fair Value and Intrinsic Value of RSU's	Years Ended December 31, 2017 2016 2015 Weighted-average grant date fair value $ 24.32 $ 15.07 $ 17.31 Intrinsic value of RSUs released $ 4,485 $ 1,520 $ 2,933
Summary of Changes of Nonvested RSU's	A summary of nonvested RSUs is presented below: RSUs Weighted Nonvested at January 1, 2017 251,245 $ 15.81 Granted 57,740 $ 24.32 Vested (158,496 ) $ 16.40 Forfeited (10,953 ) $ 17.11 Nonvested at December 31, 2017 139,536 $ 18.56
Schedule of Components of Performance-Based RSU's	A summary of PSUs for all Plans is presented below: Units Weighted Weighted Aggregate Outstanding at January 1, 2016 201,900 $ 16.48 Granted 123,919 $ 23.83 Released (43,275 ) $ 21.66 Forfeited (26,524 ) $ 22.56 Added by performance factor 15,285 $ 21.66 Outstanding at December 31, 2017 271,305 $ 18.77 1.62 $ 6,986 Releasable at December 31, 2017 — $ — — $ — The following table summarizes each grant of performance awards outstanding at December 31, 2017 : Description Grant Date Vesting Vesting Target Outstanding Maximum Number of Units to be Granted 2015-2017 Performance RSUs February 5, 2015 2018 35% RTSR, 35% sales growth, 30% cash flow 62,000 124,000 2016-2018 Performance RSUs February 16, 2016 2019 35% RTSR, 35% sales growth, 30% cash flow 92,840 185,680 2017-2019 Performance RSUs February 9, 2017 2020 35% RTSR, 35% sales growth, 30% cash flow 71,796 143,592 2017-2019 Performance RSUs February 9, 2017 2018- 2020 Operating Income 40,669 40,669 Single Crystal Performance RSUs March 31, 2016 2019 Various 4,000 8,000 Total 271,305 501,941

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Summary of Financial Liability Measured at Fair Value on a Recurring Basis	The table below summarizes the financial assets and liabilities that were measured at fair value on a recurring basis as of December 31, 2017 and the (gain) loss recorded during the year ended December 31, 2017 : Asset (Liability) Carrying Quoted Prices Significant Significant (Gain) loss for Year Ended Interest rate swap — cash flow hedge $ 971 $ — $ 971 $ — $ 37 Foreign currency hedges $ (742 ) $ — $ (742 ) $ — $ (38 ) The table below summarizes the financial liability that was measured at fair value on a recurring basis as of December 31, 2016 and the (gain) loss recorded during the year ended December 31, 2016 : Asset (Liability) Carrying Quoted Prices Significant Significant (Gain) loss for Interest rate swap — cash flow hedge $ 753 $ — $ 753 $ — $ (928 ) Foreign currency hedges $ (601 ) $ (601 ) $ 18
Reconciliation of Recurring Financial Liability Related to Interest Rate Swaps	Derivatives Our earnings and cash flows are subject to fluctuations due to changes in foreign currency exchange rates and interest rates. We selectively use derivative financial instruments including foreign currency forward contracts and interest rate swaps to manage our exposure to these risks. The use of derivative financial instruments exposes the Company to credit risk, which relates to the risk of nonperformance by a counterparty to the derivative contracts. We manage our credit risk by entering into derivative contracts with only highly rated financial institutions and by using netting agreements. Foreign Currency Hedges In January of 2016, we began using forward contracts to mitigate currency risk related to a portion of our forecasted foreign Euro denominated revenues and Mexican Peso denominated expenses. The currency forward contracts are designed as cash flow hedges and are recorded in the Consolidated Balance Sheets at fair value. At least quarterly, we assess the effectiveness of these hedging relationships based on the total change in their fair value using regression analysis. The effective portion of derivative gains and losses are recorded in accumulated other comprehensive loss until the hedged transaction affects earnings upon settlement, at which time they are reclassified to net sales and cost of goods sold. Ineffectiveness is recorded in other income (expense) in our Consolidated Statements of Earnings. If it becomes probable that an anticipated transaction that is hedged will not occur by the end of the originally specified time period, we reclassify the gains or losses related to that hedge from accumulated other comprehensive loss to other income (expense). As of December 31, 2017 , we were hedging a portion of our forecasted Peso expenses and Euro denominated revenue for the following twelve months. We continue to monitor the Company’s overall currency exposure and may elect to add cash flow hedges in the future. At December 31, 2017 , we had a net unrealized loss of $ 683 in accumulated other comprehensive loss, of which $ 567 is expected to be reclassified to income within the next 12 months. The notional amount of foreign currency forward contracts outstanding was $ 33.2 million at December 31, 2017 . Interest Rate Swaps We use interest rate swaps to convert the revolving credit facility’s variable rate of interest into a fixed rate on a portion of our debt balance. In the second quarter of 2012, we entered into four separate one-year interest rate swap agreements to fix interest rates on $50,000 of long-term debt for the periods January 2013 to January 2017. In the third quarter of 2012, we entered into four additional one-year interest rate swap agreements to fix interest rates on $25,000 of long-term debt for the periods January 2013 to January 2017. In the third quarter of 2016, we entered into three additional one-year interest rate swap agreements to fix interest rates on $50,000 of long-term debt for the periods August 2017 to August 2020. The difference to be paid or received under the terms of the swap agreements will be recognized as an adjustment to interest expense when settled. These swaps are treated as cash flow hedges and consequently, the changes in fair value were recorded in other comprehensive income (loss). The estimated net amount of the existing gains or losses that are reported in accumulated other comprehensive income (loss) that is expected to be reclassified into earnings within the next twelve months is approximately $ 278 . The location and fair values of derivative instruments designated as hedging instruments in the Consolidated Balance Sheets as of December 31, 2017 , are shown in the following table: As of December 31, 2017 2016 Foreign currency hedges reported in Accrued expenses and other liabilities $ 742 $ 601 Interest rate swaps reported in Other current assets $ 278 $ 2 Interest rate swaps reported in Other assets $ 693 $ 751 The Company has elected to net its foreign currency derivative assets and liabilities in the balance sheet in accordance with ASC 210-20 (Balance Sheet, Offsetting). On a gross basis, there were $ 97 foreign currency derivative assets and foreign currency derivative liabilities were $ 839 . The effect of derivative instruments on the Consolidated Statements of Earnings is as follows: Years Ended December 31, 2017 2016 2015 Foreign Exchange Contracts: Amounts reclassified from AOCI to earnings Net sales $ (488 ) $ (124 ) $ — Cost of goods sold 497 111 — Selling, general and administrative 45 1 — Total amounts reclassified from AOCI to earnings 54 (12 ) — Loss recognized in other expense for hedge ineffectiveness (1 ) (1 ) — Loss recognized in other expense for derivatives not designated as cash flow hedges (15 ) (5 ) — Total derivative gain (loss) on foreign exchange contracts recognized in earnings 38 (18 ) — Interest Rate Swaps: Interest Expense $ (37 ) $ (928 ) $ (768 ) Total income (loss) on derivatives recognized in earnings $ 1 $ (946 ) $ (768 ) The table below provides a reconciliation of the recurring financial assets and liabilities related to interest rate swaps and foreign currency hedges: Interest Rate Foreign Currency Hedges Balance at January 1, 2016 $ (768 ) $ — Settled in cash — 54 Total gains (losses) for the period: Included in earnings 928 (18 ) Included in other comprehensive earnings (loss) 593 (637 ) Balance at January 1, 2017 $ 753 $ (601 ) Settled in cash — (132 ) Total gains (losses) for the period: Included in earnings — 38 Included in other comprehensive earnings (loss) 218 (47 ) Balance at December 31, 2017 $ 971 $ (742 )

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Earnings Before Income Taxes	Earnings before income taxes consist of the following: Years Ended December 31, 2017 2016 2015 U.S. $ 9,315 $ 25,746 $ (141 ) Non-U.S. 30,938 31,499 12,402 Total $ 40,253 $ 57,245 $ 12,261
Significant Components of Income Tax Provision/(Benefit)	Significant components of income tax provision/(benefit) are as follows: Years Ended December 31, 2017 2016 2015 Current: U.S. $ 1,635 $ (1,312 ) $ 329 Non-U.S. 7,150 13,729 12,482 Total Current 8,785 12,417 12,811 Deferred: U.S. 17,597 13,245 (15,795 ) Non-U.S. (577 ) (2,797 ) 8,291 Total Deferred 17,020 10,448 (7,504 ) Total provision for income taxes $ 25,805 $ 22,865 $ 5,307
Significant Components of Deferred Tax Assets and Liabilities	Significant components of our deferred tax assets and liabilities are as follows: As of December 31, 2017 2016 Post-retirement benefits $ 1,160 $ 1,798 Inventory reserves 1,128 1,834 Loss carry-forwards 5,401 7,279 Credit carry-forwards 10,793 22,743 Nondeductible accruals 7,062 11,629 Research expenditures 20,002 31,380 Stock compensation 1,803 2,681 Foreign exchange loss 1,373 1,780 Other 220 648 Gross deferred tax assets 48,942 81,772 Depreciation and amortization 9,819 9,960 Pensions 12,387 16,024 Subsidiaries' unremitted earnings 1,662 1,292 Gross deferred tax liabilities 23,868 27,276 Net deferred tax assets 25,074 54,496 Deferred tax asset valuation allowance (8,182 ) (11,024 ) Total net deferred tax assets $ 16,892 $ 43,472
Schedule of current and long-term deferred tax assets and current and long-term deferred tax liabilities	The long-term deferred tax assets and long-term deferred tax liabilities are as follows below: As of December 31, 2017 2016 Non-current deferred tax assets 20,694 45,839 Non-current deferred tax liabilities (3,802 ) (2,367 ) Total net deferred tax assets 16,892 43,472
Reconciliation of Effective Income Taxes Rate	The following table reconciles taxes at the U.S. federal statutory rate to the effective income tax rate: Years Ended December 31, 2017 2016 2015 Taxes at the U.S. statutory rate 35.0 % 35.0 % 35.0 % State income taxes, net of federal income tax benefit 1.1 % 1.4 % (0.1 )% Non-U.S. income taxed at rates different than the U.S. statutory rate (9.0 )% (7.5 )% (16.7 )% Foreign source income, net of associated foreign tax credits 0.1 % 5.3 % 6.9 % Benefit of tax credits (1.4 )% (1.0 )% (4.6 )% Non-deductible expenses 1.5 % 0.7 % 1.3 % Stock compensation - excess tax benefits (1.5 )% (0.8 )% — % Adjustment to valuation allowances (4.4 )% 3.8 % 37.8 % Benefit from prior period foreign tax credits — % — % (133.0 )% Change in unrecognized tax benefits 2.0 % 3.3 % 59.5 % Impacts of unremitted foreign earnings 0.9 % 0.6 % 60.8 % Impacts related to the 2017 Tax Cuts and Jobs Act 44.7 % — % — % Other (4.9 )% (0.9 )% (3.6 )% Effective income tax rate 64.1 % 39.9 % 43.3 %
Reconciliation of Unrecognized Tax Benefits	A reconciliation of the beginning and ending unrecognized tax benefits is provided below: 2017 2016 Balance at January 1 $ 12,347 $ 11,008 Increase related to current year tax positions — 1,088 Increase related to prior year tax positions 1,290 251 Decrease related to settlements with taxing authorities (6,331 ) — Balance at December 31 $ 7,306 $ 12,347

Business Acquisitions (Tables)

Business Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2017
Noliac A/S [Member]
Business Acquisition [Line Items]
Schedule of Business Acquisitions	On May 15, 2017, we acquired 100% of the equity interests in Noliac A/S, a privately-held company, for $19.3 million in cash. Noliac A/S is a designer and manufacturer of tape cast and bulk piezoelectric material as well as transducers for use in the telecommunications, industrial, medical, and defense industries. This acquisition will enable us to increase our product base within our ceramics product lines as well as expand our presence in the European market. The purchase price of $19,121, net of cash acquired of $ 199 , has been allocated to the assets acquired and liabilities assumed on the acquisition date based on their fair values. The following table summarizes the fair values of the assets acquired and the liabilities assumed at the date of acquisition: Fair Values at May 15, 2017 Current assets $ 2,836 Property, plant and equipment 580 Other assets 395 Goodwill 9,313 Intangible assets 9,142 Fair value of assets acquired 22,266 Less fair value of liabilities acquired (3,145 ) Net cash paid $ 19,121
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]	The following table summarizes the carrying amounts and weighted average lives of the acquired intangible assets: Carrying Value Weighted Average Amortization Period (in years) Developed technology $ 7,581 15.0 Customer relationships 937 10.0 Other 624 3.0 Total $ 9,142 13.7
CTG Advanced Materials, LLC [Member]
Business Acquisition [Line Items]
Schedule of Business Acquisitions	On March 11, 2016, we acquired all of the outstanding membership interests in CTG Advanced Materials, LLC (“CTG-AM”), a privately-held company, for $73 million in cash plus a working capital adjustment. CTG-AM, formerly operated as H.C. Materials, is the market leading designer and manufacturer of single crystal piezoelectric materials, serving major original equipment manufacturers throughout the medical marketplace. These materials enable high definition ultrasound imaging (3D and 4D), as well as intravascular ultrasound applications. Other applications for these materials include wireless pacemakers, implantable hearing aids, and defense technologies. With the CTG-AM acquisition, we gained technology and proprietary manufacturing methods that expand our offering of piezoelectric materials. This allows us to become the leading large-scale commercial producer of both single crystal materials and traditional piezoelectric ceramics. The purchase price of $73,063, net of cash acquired of $ 4 , has been allocated to the fair values of assets and liabilities acquired as of March 11, 2016. The following table summarizes the fair values of the assets acquired and the liabilities assumed at the date of acquisition: Fair Values at March 11, 2016 Current assets $ 4,215 Property, plant and equipment 6,173 Other assets 37 Goodwill 27,879 Intangible assets 35,427 Fair value of assets acquired 73,731 Less fair value of liabilities acquired (668 ) Net cash paid $ 73,063 Goodwill recorded in connection with this acquisition represents the value we expect to be created by combining the operations of the acquired business with our existing operations, including the expansion into markets within our existing business, access to new customers, and potential cost savings and synergies. Goodwill related to this acquisition is expected to be deductible for tax purposes.
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]	The following table summarizes the carrying amounts and weighted average lives of the acquired intangible assets: Carrying Value Weighted Average Amortization Period (in years) Developed technology $ 23,730 15.0 Customer relationships and contracts 11,502 14.6 Other 195 0.8 Total $ 35,427 14.8

Business Acquisitions Schedule

Business Acquisitions Schedule of Finite-Lived Intangible Assets (Tables) - USD ($) $ in Thousands	May 15, 2017	Mar. 11, 2016	Dec. 31, 2017
Noliac A/S [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]			The following table summarizes the carrying amounts and weighted average lives of the acquired intangible assets: Carrying Value Weighted Average Amortization Period (in years) Developed technology $ 7,581 15.0 Customer relationships 937 10.0 Other 624 3.0 Total $ 9,142 13.7
Schedule of Business Acquisitions, by Acquisition [Table Text Block]			On May 15, 2017, we acquired 100% of the equity interests in Noliac A/S, a privately-held company, for $19.3 million in cash. Noliac A/S is a designer and manufacturer of tape cast and bulk piezoelectric material as well as transducers for use in the telecommunications, industrial, medical, and defense industries. This acquisition will enable us to increase our product base within our ceramics product lines as well as expand our presence in the European market. The purchase price of $19,121, net of cash acquired of $ 199 , has been allocated to the assets acquired and liabilities assumed on the acquisition date based on their fair values. The following table summarizes the fair values of the assets acquired and the liabilities assumed at the date of acquisition: Fair Values at May 15, 2017 Current assets $ 2,836 Property, plant and equipment 580 Other assets 395 Goodwill 9,313 Intangible assets 9,142 Fair value of assets acquired 22,266 Less fair value of liabilities acquired (3,145 ) Net cash paid $ 19,121
Fair Value	$ 9,142
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	13 years 8 months
Noliac A/S [Member] | Developed Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value	$ 7,581
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years
Noliac A/S [Member] | Customer Relationships and Contracts
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value	$ 937
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years
Noliac A/S [Member] | Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value	$ 624
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	3 years
CTG Advanced Materials, LLC [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]			The following table summarizes the carrying amounts and weighted average lives of the acquired intangible assets: Carrying Value Weighted Average Amortization Period (in years) Developed technology $ 23,730 15.0 Customer relationships and contracts 11,502 14.6 Other 195 0.8 Total $ 35,427 14.8
Schedule of Business Acquisitions, by Acquisition [Table Text Block]			On March 11, 2016, we acquired all of the outstanding membership interests in CTG Advanced Materials, LLC (“CTG-AM”), a privately-held company, for $73 million in cash plus a working capital adjustment. CTG-AM, formerly operated as H.C. Materials, is the market leading designer and manufacturer of single crystal piezoelectric materials, serving major original equipment manufacturers throughout the medical marketplace. These materials enable high definition ultrasound imaging (3D and 4D), as well as intravascular ultrasound applications. Other applications for these materials include wireless pacemakers, implantable hearing aids, and defense technologies. With the CTG-AM acquisition, we gained technology and proprietary manufacturing methods that expand our offering of piezoelectric materials. This allows us to become the leading large-scale commercial producer of both single crystal materials and traditional piezoelectric ceramics. The purchase price of $73,063, net of cash acquired of $ 4 , has been allocated to the fair values of assets and liabilities acquired as of March 11, 2016. The following table summarizes the fair values of the assets acquired and the liabilities assumed at the date of acquisition: Fair Values at March 11, 2016 Current assets $ 4,215 Property, plant and equipment 6,173 Other assets 37 Goodwill 27,879 Intangible assets 35,427 Fair value of assets acquired 73,731 Less fair value of liabilities acquired (668 ) Net cash paid $ 73,063 Goodwill recorded in connection with this acquisition represents the value we expect to be created by combining the operations of the acquired business with our existing operations, including the expansion into markets within our existing business, access to new customers, and potential cost savings and synergies. Goodwill related to this acquisition is expected to be deductible for tax purposes.
Fair Value		$ 35,427
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		14 years 9 months 20 days
CTG Advanced Materials, LLC [Member] | Developed Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value		$ 23,730
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		15 years
CTG Advanced Materials, LLC [Member] | Customer Relationships and Contracts
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value		$ 11,502
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		14 years 7 months 6 days
CTG Advanced Materials, LLC [Member] | Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value		$ 195
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		9 months 18 days

Geographic Data (Tables)

Geographic Data (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Schedule of Revenue and Long-Lived Assets by Geographic Areas	Financial information relating to our operations by geographic area were as follows: Net Sales Years Ended December 31, 2017 2016 2015 United States $ 287,092 $ 276,033 $ 238,796 Singapore 5,596 6,668 8,379 China 66,510 59,506 55,825 Canada — — 24,519 Czech Republic 34,476 34,767 36,348 Other non-U.S. 29,319 19,705 18,443 Consolidated net sales $ 422,993 $ 396,679 $ 382,310 Sales are attributed to countries based upon the origin of the sale. Long-Lived Assets Years Ended December 31, 2017 2016 United States $ 45,354 $ 42,488 China 32,464 33,013 United Kingdom 590 569 Taiwan 3,540 2,755 Czech Republic 5,518 2,634 Other non-U.S 781 652 Consolidated long-lived assets $ 88,247 $ 82,111

Quarterly Financial Data (Table

Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Results of Operations	Quarterly Results of Operations (Unaudited) First Second Third Fourth 2017 Net sales $ 100,154 $ 105,686 $ 106,243 $ 110,910 Gross margin $ 34,224 $ 35,794 $ 37,538 $ 32,875 Operating earnings (loss) $ 12,196 $ 13,208 $ 13,111 $ (19 ) Net earnings (loss) $ 8,484 $ 9,966 $ 9,619 $ (13,621 ) Basic earnings (loss) per share $ 0.26 $ 0.30 $ 0.29 $ (0.41 ) Diluted earnings (loss) per share $ 0.25 $ 0.30 $ 0.29 $ (0.41 ) 2016 Net sales $ 96,705 $ 98,693 $ 99,697 $ 101,584 Gross margin $ 33,468 $ 34,457 $ 36,641 $ 35,861 Operating earnings $ 12,433 $ 24,097 $ 12,490 $ 14,146 Net earnings $ 7,863 $ 14,487 $ 3,720 $ 8,310 Basic earnings per share $ 0.24 $ 0.44 $ 0.11 $ 0.25 Diluted earnings per share $ 0.24 $ 0.44 $ 0.11 $ 0.25

Summary of Significant Accoun51

Summary of Significant Accounting Policies - Additional Information (Details 2)	12 Months Ended
	Dec. 31, 2017segment
Description of Business
Number or reportable segments	1
Cash and Cash Equivalents
Maturity period of highly liquid investments	3 months

Summary of Significant Accoun52

Summary of Significant Accounting Policies - Concentration of Credit Risk (Details 3) - Sales Revenue, Goods, Net - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cummins, Inc. [Member]
Summary of Significant Accounting Policies
Concentration of risk, percentage	13.40%	9.90%	9.30%
Honda Motor Co.
Summary of Significant Accounting Policies
Concentration of risk, percentage	11.20%	10.70%	10.70%
Toyota Motor Corporation
Summary of Significant Accounting Policies
Concentration of risk, percentage	10.20%	10.40%	10.10%

Summary of Significant Accoun53

Summary of Significant Accounting Policies - Property, Plant and Equipment (Details 4)	12 Months Ended
	Dec. 31, 2017
Building and Building Improvements | Minimum
Property, Plant and Equipment
Property, Plant and Equipment, useful lives	10 years
Building and Building Improvements | Maximum
Property, Plant and Equipment
Property, Plant and Equipment, useful lives	45 years
Machinery and Equipment | Minimum
Property, Plant and Equipment
Property, Plant and Equipment, useful lives	3 years
Machinery and Equipment | Maximum
Property, Plant and Equipment
Property, Plant and Equipment, useful lives	15 years

Summary of Significant Accoun54

Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details 5)	12 Months Ended
	Dec. 31, 2017
Goodwill and Other Intangible Assets
Finite-Lived Intangible Assets, Remaining Amortization Period	10 years 6 months
Customer-Related Intangible Assets
Goodwill and Other Intangible Assets
Finite-Lived Intangible Assets, Remaining Amortization Period	10 years 6 months
Technology and other intangibles
Goodwill and Other Intangible Assets
Finite-Lived Intangible Assets, Remaining Amortization Period	8 years 4 months

Summary of Significant Accoun55

Summary of Significant Accounting Policies - Research and Development (Details 6) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Research and Development
Reimbursements received from customers	$ 4,299	$ 2,036	$ 1,861
Other Current Assets
Research and Development
Cost of molds, dies and other tools included in other current assets	$ 3,382	$ 2,837

Summary of Significant Accoun56

Summary of Significant Accounting Policies - Earnings Per Share (Details 7) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Anti-dilutive Securities
Antidilutive stock options and RSUs	22,110	35,189	13,979

Summary of Significant Accoun57

Summary of Significant Accounting Policies - Foreign Currencies (Details 8) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Nonoperating Income (Expense) [Member]
Foreign Currencies
Foreign currency (loss) gain	$ 3,052	$ (3,714)	$ (6,299)

Summary of Significant Accoun58

Summary of Significant Accounting Policies - Goodwill and Indefinite-lived Intangibles Impairment (Details 9) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Impairment of Long-Lived Assets and Long-lived Assets to be Disposed of
Goodwill, loss	$ 0	$ 0	$ 0
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 0	$ 0	$ 0

Summary of Significant Accoun59

Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Reclassification (Details 10) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other current assets	$ 12,857	$ 10,638
Deferred income taxes	20,694	45,839
Accrued Liabilities, Current	$ (41,344)	$ (45,708)

Accounts Receivable - Component

Accounts Receivable - Components of Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accounts Receivable
Accounts receivable, gross	$ 70,941	$ 62,782
Less: Allowance for doubtful accounts	(357)	(170)
Accounts receivable, net	$ 70,584	$ 62,612

Inventories - Summary of Invent

Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Inventories
Finished goods	$ 9,203	$ 7,513
Work-in-process	12,065	9,596
Raw materials	21,150	17,680
Less: Inventory reserves	(5,822)	(6,137)
Inventories, net	$ 36,596	$ 28,652

Property, Plant and Equipment -

Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment
Less: Accumulated depreciation	$ (200,734)	$ (197,038)
Property, plant and equipment, net	88,247	82,111
Land
Property, Plant and Equipment
Property, plant and equipment gross	1,130	2,330
Buildings and improvements
Property, Plant and Equipment
Property, plant and equipment gross	64,201	63,621
Machinery and equipment
Property, Plant and Equipment
Property, plant and equipment gross	$ 223,650	$ 213,198

Property, Plant and Equipment63

Property, Plant and Equipment - Depreciation Expense (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Continuing Operations
Property, Plant and Equipment
Depreciation expense	$ 14,071	$ 13,177	$ 12,219

Retirement Plans - Additional I

Retirement Plans - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Retirement Plans
Noncontributory benefit pension plans covering active employees	5.00%
Defined Benefit Plan, Plan Assets, Payment for Settlement	$ 23,900,000
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	23,912,000
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax	$ 13,476,000
Loss on termination of pension plan			$ 8,280,000
Amortization period	18 years
Amortization of retirement benefits, net of tax	$ 5,888,000
Defined Benefit Plan, Accounting Policy Election, Measurement Date	Dec. 31, 2017
Post-Retirement Life Insurance Plan
Retirement Plans
Amortization period	3 years
Domestic Plan [Member]
Retirement Plans
Settlement loss	$ 13,476,000	$ 0	0
Expected contribution to be made by CTS	101,000
Foreign Plan [Member]
Retirement Plans
Settlement loss	0	$ 0	$ 0
Expected contribution to be made by CTS	$ 331,000

Retirement Plans - Reconciliati

Retirement Plans - Reconciliation of Benefit Obligation, Plan Assets, and Funded Status (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Change in plan assets:
Beginning Balance	$ 293,567
Ending Balance	286,539	$ 293,567
Defined Benefit Plan, Benefit Obligation, Benefits Paid	$ (165)	$ (165)
Post-Retirement Life Insurance Plan
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.59%	4.10%	4.43%
Retirement Plans
Defined Benefit Plan, Accumulated Benefit Obligation	$ 5,134	$ 4,952
Change in projected benefit obligation:
Beginning Balance	4,952	4,886
Service cost	2	3	$ 5
Interest cost	161	207	204
Actuarial loss (gain)	184	21
Ending Balance	5,134	4,952	4,886
Change in plan assets:
Beginning Balance	0	0
Actual return on assets	0	0
Company contributions	165	165
Foreign exchange impact	0	0
Ending Balance	0	0	$ 0
Funded status (plan assets less projected benefit obligations)	(5,134)	(4,952)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	$ (165)	$ (165)
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.63%	4.16%	4.43%
Retirement Plans
Defined Benefit Plan, Accumulated Benefit Obligation	$ 228,934	$ 247,276
Change in projected benefit obligation:
Beginning Balance	247,276	256,924
Service cost	0	87	$ 171
Interest cost	8,273	11,024	11,258
Actuarial loss (gain)	12,562	(222)
Foreign exchange impact	0	0
Ending Balance	228,934	247,276	256,924
Change in plan assets:
Beginning Balance	292,044	289,315
Actual return on assets	31,559	23,163
Company contributions	336	103
Foreign exchange impact	0	0
Ending Balance	284,762	292,044	$ 289,315
Funded status (plan assets less projected benefit obligations)	55,828	44,768
Defined Benefit Plan, Benefit Obligation, Benefits Paid	$ (39,177)	$ (20,537)
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	1.38%	1.13%	1.63%
Retirement Plans
Defined Benefit Plan, Accumulated Benefit Obligation	$ 2,535	$ 2,295
Change in projected benefit obligation:
Beginning Balance	2,866	2,796
Service cost	48	51	$ 63
Interest cost	34	46	465
Actuarial loss (gain)	164	229
Foreign exchange impact	238	33
Ending Balance	3,140	2,866	2,796
Change in plan assets:
Beginning Balance	1,523	1,480
Actual return on assets	17	11
Company contributions	319	303
Foreign exchange impact	128	18
Ending Balance	1,777	1,523	$ 1,480
Funded status (plan assets less projected benefit obligations)	(1,363)	(1,343)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	$ (210)	$ (289)

Retirement Plans - Components o

Retirement Plans - Components of Prepaid (Accrued) Cost (Details 3) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Retirement Plans
Prepaid pension asset	$ 57,050	$ 46,183
Post-Retirement Life Insurance Plan
Retirement Plans
Accrued expenses and other liabilities	(418)	(387)
Long-term pension obligations	(4,716)	(4,565)
Components of prepaid (accrued) cost, net	(5,134)	(4,952)
Domestic Plan [Member]
Retirement Plans
Prepaid pension asset	57,050	46,183
Accrued expenses and other liabilities	(100)	(317)
Long-term pension obligations	(1,122)	(1,098)
Components of prepaid (accrued) cost, net	55,828	44,768
Foreign Plan [Member]
Retirement Plans
Prepaid pension asset	0	0
Accrued expenses and other liabilities	0	0
Long-term pension obligations	(1,363)	(1,343)
Components of prepaid (accrued) cost, net	$ (1,363)	$ (1,343)

Retirement Plans - Accumulated

Retirement Plans - Accumulated Other Comprehensive loss (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Loss
Amortization period	18 years
Post-Retirement Life Insurance Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation	$ 5,134	$ 4,952
Accumulated Other Comprehensive Loss
Amortization period	3 years
Post-Retirement Life Insurance Plan | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss)
Accumulated Other Comprehensive Loss
Beginning balance	$ (560)	(669)
Amortization of retirement benefits, net of tax	64	95
Net actuarial (loss) gain	117	14
Ending balance	(379)	(560)
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation	228,934	247,276
Accumulated Other Comprehensive Loss
Beginning balance	89,763	96,388
Amortization of retirement benefits, net of tax	(3,685)	(3,817)
Settlements	(8,585)
Net actuarial (loss) gain	(1,753)	(2,808)
Foreign exchange impact	0	0
Ending balance	75,740	89,763
Domestic Plan [Member] | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss)
Accumulated Other Comprehensive Loss
Beginning balance	89,763	96,388
Amortization of retirement benefits, net of tax	(3,685)	(3,817)
Settlements	(8,585)
Net actuarial (loss) gain	(1,753)	(2,808)
Foreign exchange impact	0	0
Ending balance	75,740	89,763
Domestic Plan [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit)
Accumulated Other Comprehensive Loss
Beginning balance	0	0
Amortization of retirement benefits, net of tax	0	0
Settlements	0
Net actuarial (loss) gain	0	0
Foreign exchange impact	0	0
Ending balance	0	0
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation	2,535	2,295
Foreign Plan [Member] | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss)
Accumulated Other Comprehensive Loss
Beginning balance	1,743	1,639
Amortization of retirement benefits, net of tax	10	85
Settlements	0
Net actuarial (loss) gain	2	12
Foreign exchange impact	143	7
Ending balance	$ 1,898	$ 1,743

Retirement Plans - Projected be

Retirement Plans - Projected benefit obligation, accumulated benefit obligation and fair value of plan assets (Details 5) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Retirement Plans
Projected benefit obligation	$ 4,361	$ 4,281
Accumulated benefit obligation	3,757	3,710
Fair value of plan assets	$ 1,776	$ 1,523

Retirement Plans - Net Pension

Retirement Plans - Net Pension Income or Postretirement Expense (Details 6) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Post-Retirement Life Insurance Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	$ 418
Net pension expense (income)
Service cost	2	$ 3	$ 5
Interest cost	161	207	204
Defined Benefit Plan, Amortization of Gain (Loss)	101	149	101
Net expense (income)	$ 62	$ 61	$ 108
Benefit obligation assumptions:
Discount rate	3.59%	4.10%	4.43%
Rate of compensation increase	0.00%	0.00%	0.00%
Pension income/expense assumptions:
Discount rate	4.10%	4.43%	4.07%
Rate of compensation increase	0.00%	0.00%	0.00%
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	$ 67
Net pension expense (income)
Service cost	48	$ 51	$ 63
Interest cost	34	46	465
Expected return on plan assets	(20)	(26)	(446)
Defined Benefit Plan, Amortization of Gain (Loss)	(155)	(140)	(7,492)
Additional cost due to early retirement	0	0	651
Settlement loss	0	0	0
Net expense (income)	$ 217	$ 211	$ 8,225
Benefit obligation assumptions:
Discount rate	1.38%	1.13%	1.63%
Rate of compensation increase	2.00%	2.00%	2.00%
Pension income/expense assumptions:
Discount rate	1.13%	1.63%	3.13%
Expected return on plan assets	1.13%	1.63%	2.00%
Rate of compensation increase	2.00%	2.00%	0.48%
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	$ 15,693
Net pension expense (income)
Service cost	0	$ 87	$ 171
Interest cost	8,273	11,024	11,258
Expected return on plan assets	(16,243)	(18,976)	(20,272)
Defined Benefit Plan, Amortization of Gain (Loss)	(5,785)	(5,994)	(6,339)
Additional cost due to early retirement	0	0	0
Settlement loss	13,476	0	0
Net expense (income)	$ 11,291	$ (1,871)	$ (2,504)
Benefit obligation assumptions:
Discount rate	3.63%	4.16%	4.43%
Rate of compensation increase	0.00%	0.00%	0.00%
Pension income/expense assumptions:
Discount rate	4.16%	4.43%	4.07%
Expected return on plan assets	5.61%	6.63%	7.00%
Rate of compensation increase	0.00%	0.00%	0.00%

Retirement Plans - Pension Plan

Retirement Plans - Pension Plan Asset Allocation (Details 7) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Retirement Plans
Target allocations	100.00%
Percentage of plan assets	100.00%	100.00%
Equity Securities
Retirement Plans
Target allocations	13.00%
Percentage of plan assets	11.00%	25.00%
Equity Securities | Common Stock
Retirement Plans
Percentage of plan assets		6.00%
CTS common stock included in pension plan assets, Amount	$ 0	$ 17,700
Debt securities
Retirement Plans
Target allocations	83.00%
Percentage of plan assets	82.00%	59.00%
Other
Retirement Plans
Target allocations	4.00%
Percentage of plan assets	7.00%	16.00%

Retirement Plans - Summary of F

Retirement Plans - Summary of Fair Values of Pension Plan (Details 8) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair values of pension plan assets
Total fair value of plan assets	$ 286,539	$ 293,567
Equity Securities | U.S.
Fair values of pension plan assets
Total fair value of plan assets	19,487	43,708
Equity Securities | non-U.S.
Fair values of pension plan assets
Total fair value of plan assets	1,131	819
Equity Funds
Fair values of pension plan assets
Total fair value of plan assets	1,314	28,052
Equity Funds | International LP
Fair values of pension plan assets
Total fair value of plan assets		28,052
Bond funds - government
Fair values of pension plan assets
Total fair value of plan assets	3,126	22,237
Bond funds - other
Fair values of pension plan assets
Total fair value of plan assets	231,710	150,712
Real estate
Fair values of pension plan assets
Total fair value of plan assets	1,235	3,812
Cash and Cash Equivalents
Fair values of pension plan assets
Total fair value of plan assets	11,145	7,823
Partnership
Fair values of pension plan assets
Total fair value of plan assets	10,787	12,862
International hedge funds
Fair values of pension plan assets
Total fair value of plan assets	$ 6,604	$ 23,542

Retirement Plans - Summary of C

Retirement Plans - Summary of Categories in Fair Value Hierarchy (Details 9) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets	$ 286,539	$ 293,567
Equity Securities | U.S.
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets	19,487	43,708
Equity Securities | non-U.S.
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets	1,131	819
Equity Funds
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets	1,314	28,052
Equity Funds | International LP
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets		28,052
Bond funds - government
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets	3,126	22,237
Bond funds - other
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets	231,710	150,712
Real estate
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets	1,235	3,812
Cash and Cash Equivalents
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets	11,145	7,823
Partnership
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets	10,787	12,862
International hedge funds
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets	6,604	23,542
Quoted Prices in Active Markets (Level 1)
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets	31,763	52,350
Quoted Prices in Active Markets (Level 1) | Equity Securities | U.S.
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets	19,487	43,708
Quoted Prices in Active Markets (Level 1) | Equity Securities | non-U.S.
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets	1,131	819
Quoted Prices in Active Markets (Level 1) | Cash and Cash Equivalents
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets	11,145	7,823
Significant Other Observable Inputs (Level 2)
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets	236,150	201,001
Significant Other Observable Inputs (Level 2) | Equity Securities | non-U.S.
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Significant Other Observable Inputs (Level 2) | Equity Funds
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets	1,314
Significant Other Observable Inputs (Level 2) | Equity Funds | International LP
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets		28,052
Significant Other Observable Inputs (Level 2) | Bond funds - government
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets	3,126	22,237
Significant Other Observable Inputs (Level 2) | Bond funds - other
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets	231,710	150,712
Significant Other Observable Inputs (Level 2) | Real estate
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Significant Unobservable Inputs (Level 3)
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets	10,787	12,862
Significant Unobservable Inputs (Level 3) | Partnership
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets	10,787	12,862	$ 13,360
Significant Unobservable Inputs (Level 3) | International hedge funds
Fair values of pension plan assets
Defined Benefit Plan, Fair Value of Plan Assets	$ 0	$ 0

Retirement Plans - Reconcilia73

Retirement Plans - Reconciliation of Level 3 Hedge Fund Asset Within Fair Value Hierarchy (Details 11) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Reconciliation of Level 3 fund assets
Beginning Balance	$ 293,567
Ending Balance	286,539
International hedge funds
Reconciliation of Level 3 fund assets
Beginning Balance	23,542
Ending Balance	6,604
Significant Unobservable Inputs (Level 3)
Reconciliation of Level 3 fund assets
Beginning Balance	12,862
Ending Balance	10,787
Significant Unobservable Inputs (Level 3) | International hedge funds
Reconciliation of Level 3 fund assets
Beginning Balance	0
Ending Balance	$ 0

Retirement Plans - Reconcilia74

Retirement Plans - Reconciliation of Level 3 Partnership Assets Within Fair Value Hierarchy (Details 12) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Level 3 fund assets
Beginning Balance	$ 293,567
Ending Balance	286,539	$ 293,567
Partnership
Reconciliation of Level 3 fund assets
Beginning Balance	12,862
Ending Balance	10,787	12,862
Significant Unobservable Inputs (Level 3) [Member]
Reconciliation of Level 3 fund assets
Beginning Balance	12,862
Ending Balance	10,787	12,862
Significant Unobservable Inputs (Level 3) [Member] | Partnership
Reconciliation of Level 3 fund assets
Beginning Balance	12,862	13,360
Capital contributions	343	1,419
Realized and unrealized gain	2,107	584
Capital distributions	(4,525)	(2,501)
Ending Balance	$ 10,787	$ 12,862

Retirement Plans - Reconcilia75

Retirement Plans - Reconciliation of Level 3 Fixed Annuity Contracts Within Fair Value Hierarchy (Details 13) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Level 3 fund assets
Beginning Balance	$ 293,567
Benefits paid	(165)	$ (165)
Ending Balance	286,539	293,567
Significant Unobservable Inputs (Level 3)
Reconciliation of Level 3 fund assets
Beginning Balance	12,862
Ending Balance	$ 10,787	$ 12,862

Retirement Plans - Estimated Fu

Retirement Plans - Estimated Future Benefit Payments (Details 14) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 286,539	$ 293,567
Post-Retirement Life Insurance Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0	$ 0
Estimated Future Benefit Payments
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	418
2,017	405
2,018	392
2,019	378
2,020	363
2023-2026	1,610
Total	3,566
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	284,762	292,044	289,315
Estimated Future Benefit Payments
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	15,693
2,017	15,705
2,018	15,673
2,019	15,548
2,020	15,361
2023-2026	72,669
Total	150,649
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	1,777	$ 1,523	$ 1,480
Estimated Future Benefit Payments
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	67
2,017	72
2,018	242
2,019	63
2,020	69
2023-2026	532
Total	$ 1,045

Retirement Plans - Defined Cont

Retirement Plans - Defined Contribution Plans (Details 15) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Contribution Plans
401(k) and other plan expense	$ 3,141	$ 2,841	$ 3,352

Goodwill and Other Intangible78

Goodwill and Other Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other intangible assets:
Gross Carrying Amount	$ 121,302	$ 112,620
Accumulated Amortization	(54,359)	(48,250)
Net Amount	66,943	64,370
Amortization expense	$ 6,603	5,815	$ 4,035
Finite-Lived Intangible Assets, Remaining Amortization Period	10 years 6 months
Customer lists / relationships
Other intangible assets:
Gross Carrying Amount	$ 64,323	63,386
Accumulated Amortization	(33,685)	(30,318)
Net Amount	$ 30,638	33,068
Finite-Lived Intangible Assets, Remaining Amortization Period	10 years 6 months
Patents
Other intangible assets:
Gross Carrying Amount	$ 10,319	10,319
Accumulated Amortization	(10,319)	(10,319)
Net Amount	0	0
Technology and other intangibles
Other intangible assets:
Gross Carrying Amount	44,460	36,715
Accumulated Amortization	(10,355)	(7,613)
Net Amount	$ 34,105	29,102
Finite-Lived Intangible Assets, Remaining Amortization Period	8 years 4 months
In process research and development
Other intangible assets:
Gross Carrying Amount	$ 2,200	2,200
Accumulated Amortization	0	0
Net Amount	$ 2,200	$ 2,200

Goodwill and Other Intangible79

Goodwill and Other Intangible Assets - Amortization Expense Remaining (Details 2) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Amortization expense remaining
2,016	$ 6,763
2,017	6,754
2,018	6,624
2,019	6,467
2,020	6,230
Thereafter	34,105
Net Amount	$ 66,943	$ 64,370

Goodwill and Other Intangible80

Goodwill and Other Intangible Assets - Summary of Reconciliation of Goodwill (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill
Beginning balance	$ 61,744	$ 33,865
Increase from acquisition	9,313	27,879
Ending balance	$ 71,057	$ 61,744

Costs Associated with Exit an81

Costs Associated with Exit and Restructuring Activities - Additional Information (Details) $ in Thousands	12 Months Ended			19 Months Ended	21 Months Ended	31 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2017USD ($)position	Dec. 31, 2015position	Dec. 31, 2015position
Restructuring charges
Restructuring Charges	$ 4,139	$ 3,048	$ 14,564
June 2013 Plan April 2014 Plan and June 2016 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	4,139	3,048	15,195
June 2013 Plan April 2014 Plan and June 2016 Plan | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	0	0	631
June 2013 Plan April 2014 Plan and June 2016 Plan | Operating Expense
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	4,139	3,048	14,564
June2016 Plan
Restructuring charges
Elimination of workforce | position				230
June2016 Plan | Operating Expense
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	13,400			$ 13,400
Restructuring charges
Restructuring Charges	4,139	3,048
June2016 Plan | Workforce reduction | Operating Expense
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	3,075			3,075
April 2014 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	9,950			9,950
Restructuring charges
Restructuring Charges	0	$ 4,923
Elimination of workforce | position					120
April 2014 Plan | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	4,050			4,050
April 2014 Plan | Operating Expense
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	5,900			5,900
April 2014 Plan | Other charges, including pension termination costs | Operating Expense
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	1,700			1,700
April 2014 Plan | Workforce reduction | Operating Expense
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	4,200			4,200
June 2013 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	22,600			22,600
Restructuring charges
Restructuring Charges			$ 10,272
June 2013 Plan | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	1,800			1,800
June 2013 Plan | Other charges, including pension termination costs | Operating Expense
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	7,650			7,650
June 2013 Plan | Workforce reduction
Restructuring charges
Elimination of workforce | position						480
June 2013 Plan | Workforce reduction | Operating Expense
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	$ 10,150			$ 10,150

Costs Associated with Exit an82

Costs Associated with Exit and Restructuring Activities - Restructuring and Restructuring Related Charges of Actual Costs (Details 2) $ in Thousands	12 Months Ended			19 Months Ended	21 Months Ended	31 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2017USD ($)position	Dec. 31, 2015position	Dec. 31, 2015position
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 4,139	$ 3,048	$ 14,564
April 2014 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0	4,923
Restructuring charges
Restructuring and Related Cost, Expected Cost	9,950			$ 9,950
Actual costs incurred	8,393			8,393
Elimination of workforce | position					120
April 2014 Plan | Cost of goods sold
Restructuring charges
Restructuring and Related Cost, Expected Cost	4,050			4,050
Actual costs incurred	557			557
April 2014 Plan | Operating Expense
Restructuring charges
Restructuring and Related Cost, Expected Cost	5,900			5,900
Actual costs incurred	7,836			7,836
April 2014 Plan | Inventory write-down | Cost of goods sold
Restructuring charges
Restructuring and Related Cost, Expected Cost	850			850
Actual costs incurred	0			0
April 2014 Plan | Equipment relocation | Cost of goods sold
Restructuring charges
Restructuring and Related Cost, Expected Cost	1,800			1,800
Actual costs incurred	444			444
April 2014 Plan | Other charges | Cost of goods sold
Restructuring charges
Restructuring and Related Cost, Expected Cost	1,400			1,400
Actual costs incurred	113			113
April 2014 Plan | Workforce reduction | Operating Expense
Restructuring charges
Restructuring and Related Cost, Expected Cost	4,200			4,200
Actual costs incurred	4,423			4,423
April 2014 Plan | Other charges, including pension termination costs | Operating Expense
Restructuring charges
Restructuring and Related Cost, Expected Cost	1,700			1,700
Actual costs incurred	3,413			$ 3,413
June2016 Plan
Restructuring charges
Elimination of workforce | position				230
June2016 Plan | Operating Expense
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	4,139	3,048
Restructuring charges
Restructuring and Related Cost, Expected Cost	13,400			$ 13,400
Actual costs incurred	7,187			7,187
June2016 Plan | Equipment relocation | Operating Expense
Restructuring charges
Restructuring and Related Cost, Expected Cost	9,025			9,025
Actual costs incurred	3,574			3,574
June2016 Plan | Other charges | Operating Expense
Restructuring charges
Restructuring and Related Cost, Expected Cost	1,300			1,300
Actual costs incurred	686			686
June2016 Plan | Workforce reduction | Operating Expense
Restructuring charges
Restructuring and Related Cost, Expected Cost	3,075			3,075
Actual costs incurred	2,927			2,927
April 2014 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	4,139	3,048	15,195
April 2014 Plan | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	0	0	631
April 2014 Plan | Operating Expense
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	4,139	3,048	14,564
June 2013 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			$ 10,272
Restructuring charges
Restructuring and Related Cost, Expected Cost	22,600			22,600
Actual costs incurred		27,596
June 2013 Plan | Cost of goods sold
Restructuring charges
Restructuring and Related Cost, Expected Cost	1,800			1,800
Actual costs incurred		3,637
June 2013 Plan | Inventory write-down | Cost of goods sold
Restructuring charges
Restructuring and Related Cost, Expected Cost	800			800
Actual costs incurred		1,143
June 2013 Plan | Equipment relocation | Cost of goods sold
Restructuring charges
Restructuring and Related Cost, Expected Cost	900			900
Actual costs incurred		1,792
June 2013 Plan | Equipment relocation | Operating Expense
Restructuring charges
Restructuring and Related Cost, Expected Cost	20,800			20,800
Actual costs incurred		23,959
June 2013 Plan | Other charges | Cost of goods sold
Restructuring charges
Restructuring and Related Cost, Expected Cost	100			100
Actual costs incurred		702
June 2013 Plan | Workforce reduction
Restructuring charges
Elimination of workforce | position						480
June 2013 Plan | Workforce reduction | Operating Expense
Restructuring charges
Restructuring and Related Cost, Expected Cost	10,150			10,150
Actual costs incurred		9,615
June 2013 Plan | Asset impairment charge | Operating Expense
Restructuring charges
Restructuring and Related Cost, Expected Cost	3,000			3,000
Actual costs incurred		4,139
June 2013 Plan | Other charges, including pension termination costs | Operating Expense
Restructuring charges
Restructuring and Related Cost, Expected Cost	$ 7,650			$ 7,650
Actual costs incurred		$ 10,205

Costs Associated with Exit an83

Costs Associated with Exit and Restructuring Activities - Restructuring Reserve Activity (Details 3) $ in Thousands	12 Months Ended			19 Months Ended	21 Months Ended	31 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2017USD ($)position	Dec. 31, 2015position	Dec. 31, 2015position
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Noncurrent	$ 187			$ 187
Restructuring Charges	4,139	$ 3,048	$ 14,564
Restructuring reserve activity
Restructuring Reserve, Current	1,726			$ 1,726
June2016 Plan
Restructuring Cost and Reserve [Line Items]
Elimination of workforce | position				230
Restructuring reserve activity
Restructuring liability at ending	1,460			$ 1,460
June 2013 Plan April 2014 Plan and June 2016 Plan
Restructuring reserve activity
Restructuring liability at beginning	2,162
Restructuring and restructuring-related charges	4,139
Cost paid	(4,445)
Restructuring Reserve, Translation and Other Adjustment	57
Restructuring liability at ending	1,913	2,162		1,913
April 2014 Plan
Restructuring Cost and Reserve [Line Items]
Elimination of workforce | position					120
Restructuring Charges	0	4,923
Restructuring and Related Cost, Expected Cost	9,950			9,950
Restructuring reserve activity
Restructuring liability at ending	0			0
June 2013 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			$ 10,272
Restructuring and Related Cost, Expected Cost	22,600			22,600
Restructuring reserve activity
Restructuring liability at ending	0			0
Operating Expense | June2016 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	4,139	$ 3,048
Restructuring and Related Cost, Expected Cost	13,400			13,400
Operating Expense | April 2014 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	5,900			5,900
Workforce reduction | June 2013 Plan
Restructuring Cost and Reserve [Line Items]
Elimination of workforce | position						480
Workforce reduction | Operating Expense | June2016 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	3,075			3,075
Workforce reduction | Operating Expense | April 2014 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	4,200			4,200
Workforce reduction | Operating Expense | June 2013 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	10,150			10,150
Equipment relocation | Operating Expense | June2016 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	9,025			9,025
Equipment relocation | Operating Expense | June 2013 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	20,800			20,800
Asset impairment charge | Operating Expense | June 2013 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	3,000			3,000
Other charges | Operating Expense | June2016 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	$ 1,300			$ 1,300

Accrued Liabilities and Other84

Accrued Liabilities and Other Liabilities - Components of Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accrued Liabilities
Accrued product-related costs	$ 5,297	$ 5,556
Accrued income taxes	5,475	9,826
Accrued property and other taxes	997	1,917
Dividends payable	1,318	1,309
Remediation reserves	17,067	18,176	$ 20,603	$ 3,918
Other accrued liabilities	11,190	8,924
Total accrued expenses and other liabilities	$ 41,344	$ 45,708

Contingencies - Rollforward of

Contingencies - Rollforward of Remediation Reserves (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Contingencies
Accrued liabilities start of period	$ 18,176	$ 20,603	$ 3,918
Remediation expense	307	556	18,591
Remediation payments	(1,416)	(2,983)	(1,906)
Accrued liabilities end of period	$ 17,067	$ 18,176	$ 20,603

Leases - Minimum future obligat

Leases - Minimum future obligations (Details) $ in Thousands	Dec. 31, 2017USD ($)
Minimum future obligations
2,016	$ 3,631
2,017	2,887
2,018	1,722
2,019	996
2,020	954
Thereafter	11,161
Total minimum lease obligations	$ 21,351

Leases - Rent expense (Details

Leases - Rent expense (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Sublease income
Rent expense	$ 4,762	$ 5,694	$ 3,550

Leases - Lease terms (Details 3

Leases - Lease terms (Details 3) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Sublease income
Sublease income	$ 445
Future sublease income due in twelve months	500
Operating Leases, Future Minimum Payments Receivable, Current	487
Future Minimum Sublease Rentals, Sale Leaseback Transactions, Thereafter	$ 1,404

Leases - Sale-leaseback transac

Leases - Sale-leaseback transaction (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2012
Sale-leaseback transaction, deferred gain
Sale-leaseback transaction gain	$ 2,108
Sale-leaseback transaction gain, deferred		$ 4,500

Debt - Long-Term Debt (Details)

Debt - Long-Term Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Long-term debt
Revolving credit facility due in 2020	$ 76,300,000	$ 89,100,000
Weighted-average interest rate	2.30%	1.90%
Amount available	$ 221,635,000	$ 208,735,000
Total credit facility	300,000,000	300,000,000
Standby letters of credit	$ 2,065,000	$ 2,165,000
Commitment fee percentage per annum	0.25%	0.25%

Debt - Additional Information (

Debt - Additional Information (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Amortization expense
Amortization expense	$ 185	$ 0	$ 175

Debt - Summary of Interest Rate

Debt - Summary of Interest Rate Swaps Activity Recorded in Other Comprehensive Income Before Tax (Details 3) - Interest Rate Swap - Designated as Hedging Instrument - Cash Flow Hedge - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest rate swap activity recorded in Other comprehensive earnings before tax
Unrealized (loss) gain	$ (255)	$ 593	$ (516)
Interest Expense
Interest rate swap activity recorded in Other comprehensive earnings before tax
Realized gain reclassified to interest expense	$ 37	$ 928	$ 768

Derivatives Derivative Financ93

Derivatives Derivative Financial Instruments - Naratives (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)item	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Sep. 30, 2012USD ($)item	Jun. 24, 2012USD ($)item
Derivative [Line Items]
Unrealized Loss on Foreign Currency Derivatives, before Tax	$ 683
Derivative Asset	97
Foreign Currency Cash Flow Hedge Liability at Fair Value	839
Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	(278)
Cash Flow Hedge | Designated as Hedging Instrument | Foreign currency hedges
Derivative [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	567
Derivative, Notional Amount	33,200
Interest rate swap - cash flow hedge	$ 742		$ 601	$ 0
Cash Flow Hedge | Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Derivative, Notional Amount		$ 50,000			$ 25,000	$ 50,000
Derivative, Number of Instruments Held | item		3			4	4
Interest rate swap - cash flow hedge			$ (753)	$ 768

Derivatives Fair Value Derivati

Derivatives Fair Value Derivatives, Balance Sheet Location (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Asset at Fair Value	$ 97
Foreign Currency Cash Flow Hedge Liability at Fair Value	839
Cash Flow Hedge | Interest Rate Swap | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Liability at Fair Value	693	$ 751
Cash Flow Hedge | Interest Rate Swap | Designated as Hedging Instrument | Other Current Assets
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Liability at Fair Value	278	2
Cash Flow Hedge | Foreign currency hedges | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Liability at Fair Value	$ 742	$ 601

Derivatives Derivative Instrume

Derivatives Derivative Instruments, Gain (Loss) Table (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	$ (94)	$ 36	$ 0
Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	1	(946)	(768)
Foreign currency hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Loss	(15)	$ (5)
Foreign currency hedges | Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Income Statement Location of Gain (Loss) Reclassified from Accumulated OCI		(12)
Loss on Cash Flow Hedge Ineffectiveness	(1)	$ (1)
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	38	(18)
Foreign currency hedges | Net sales | Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(488)	(124)
Foreign currency hedges | Cost of Goods Sold | Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	497	111
Foreign currency hedges | Selling, General and Administrative Expenses | Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 45	1
Foreign currency hedges | Other Expense [Member] | Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Income Statement Location of Gain (Loss) Reclassified from Accumulated OCI	54
Interest Rate Swap | Interest Expense | Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (37)	$ (928)	$ (768)

Accumulated Other Comprehensi96

Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated other comprehensive loss
Accumulated other comprehensive loss	$ (78,960)	$ (93,194)	$ (99,005)
Gain (Loss) recognized in OCI, Net	605	(1,190)
Gain (Loss) reclassified from AOCI to income, Net	13,629	7,001
Defined benefit pension item
Accumulated other comprehensive loss
Accumulated other comprehensive (loss) income, Gross, Beginning balance	116	(768)
Accumulated other comprehensive (loss) income, Income tax (benefit), Beginning balance	(42)	289
Accumulated other comprehensive loss	184	74	(479)
Gain (Loss) recognized in OCI, Gross	264	(56)
Gain (Loss) recognized in OCI, Income tax (benefit)	(96)	20
Gain (Loss) recognized in OCI, Net	168	(36)
Gain (Loss) reclassified from AOCI to income, Gross	(91)	940
Gain (Loss) reclassified from AOCI to income, Income tax (benefit)	33	(351)
Gain (Loss) reclassified from AOCI to income, Net	(58)	589
Accumulated other comprehensive (loss) income, Gross, Ending balance	289	116
Accumulated other comprehensive (loss) income, Income tax (benefit), Ending balance	(105)	(42)
Accumulated Defined Benefit Plans Adjustment
Accumulated other comprehensive loss
Accumulated other comprehensive (loss) income, Gross, Beginning balance	(151,618)	(161,719)
Accumulated other comprehensive (loss) income, Income tax (benefit), Beginning balance	60,672	64,361
Accumulated other comprehensive loss	(77,259)	(90,946)	(97,358)
Gain (Loss) recognized in OCI, Gross	0	0
Gain (Loss) recognized in OCI, Income tax (benefit)	0	0
Gain (Loss) recognized in OCI, Net	0	0
Gain (Loss) reclassified from AOCI to income, Gross	21,522	10,101
Gain (Loss) reclassified from AOCI to income, Income tax (benefit)	(7,835)	(3,689)
Gain (Loss) reclassified from AOCI to income, Net	13,687	6,412
Accumulated other comprehensive (loss) income, Gross, Ending balance	(130,096)	(151,618)
Accumulated other comprehensive (loss) income, Income tax (benefit), Ending balance	52,837	60,672
Unrealized gains and losses on cash flow hedges
Accumulated other comprehensive loss
Accumulated other comprehensive (loss) income, Gross, Beginning balance	(2,414)	(1,279)
Accumulated other comprehensive (loss) income, Income tax (benefit), Beginning balance	92	111
Accumulated other comprehensive loss	(1,885)	(2,322)	$ (1,168)
Gain (Loss) recognized in OCI, Gross	429	(1,135)
Gain (Loss) recognized in OCI, Income tax (benefit)	8	(19)
Gain (Loss) recognized in OCI, Net	437	(1,154)
Gain (Loss) reclassified from AOCI to income, Gross	0	0
Gain (Loss) reclassified from AOCI to income, Income tax (benefit)	0	0
Gain (Loss) reclassified from AOCI to income, Net	0	0
Accumulated other comprehensive (loss) income, Gross, Ending balance	(1,985)	(2,414)
Accumulated other comprehensive (loss) income, Income tax (benefit), Ending balance	$ 100	$ 92

Shareholders' Equity - Summary

Shareholders' Equity - Summary of Share Count and Par Value Data Related to Shareholders' Equity (Details) - $ / shares	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Preferred Stock
Par value per share	$ 0	$ 0
Shares authorized, shares	25,000,000	25,000,000
Shares outstanding, shares	0	0
Common Stock
Par value per share	$ 0	$ 0
Shares authorized, shares	75,000,000	75,000,000
Shares issued, shares	56,632,488	56,456,516
Shares outstanding	32,938,466	32,762,494	32,548,477
Treasury stock
Shares held, shares	23,694,022	23,694,022

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Common Stock
Common stock repurchased, shares	0	0
Shares available for future purchases	$ 17,554

Shareholders' Equity - Summar99

Shareholders' Equity - Summary of Common Shares Outstanding (Details 3) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Roll forward of common shares outstanding
Balance at the beginning of the year, shares	32,762,494	32,548,477
Repurchases, shares	0	0
Restricted share issuances, shares	175,972	214,017
Balance at the end of the period, shares	32,938,466	32,762,494

Equity-Based Compensation - Add

Equity-Based Compensation - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)planshares	Dec. 31, 2016USD ($)shares	Dec. 31, 2015USD ($)
Equity-Based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $	$ 5,471	$ 4,959	$ 2,803
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	271,305
Equity-Based Compensation
Number of Equity Based Compensation Plan | plan	4
Other accrued liabilities | $	$ 11,190	$ 8,924
Options
Equity-Based Compensation
Stock options exercisable cumulative annual installments period	10 years
Stock option contractual term	10 years
Employee Service Share Based Compensation Awards Stock Options Outstanding	0	0
Service-Based RSUs
Equity-Based Compensation
Number of shares issuable, against each unit of RSU	1
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights	three
Performance-Based RSUs
Equity-Based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number		201,900
Equity-Based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights	three
RSU
Equity-Based Compensation
Tax benefit from the issuance of stock | $	$ 1,927
Cash Settled Awards [Member]
Equity-Based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	14,082	12,074
Equity-Based Compensation
Other accrued liabilities | $	$ 241	$ 170
Minimum | Options
Equity-Based Compensation
Vesting period	4 years
Minimum | Performance-Based RSUs
Equity-Based Compensation
Vesting percent	0.00%
Maximum | Performance-Based RSUs
Equity-Based Compensation
Vesting percent	200.00%

Equity-Based Compensation - Sum

Equity-Based Compensation - Summary of Equity-Based Compensation Expense (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Equity-Based Compensation
Restricted stock units	$ 4,184	$ 2,738	$ 3,195
CTS Cash Settled Awards [Member]
Equity-Based Compensation
Restricted stock units	72	76	16
Service-Based RSUs
Equity-Based Compensation
Restricted stock units	1,762	1,997	1,944
Performance-Based RSUs
Equity-Based Compensation
Restricted stock units	2,350	665	1,235
RSUs
Equity-Based Compensation
Restricted stock units	4,184	2,738	3,195
Income tax benefit	1,573	1,029	1,201
Allocated Share-based Compensation Expense, Net of Tax	$ 2,611	$ 1,709	$ 1,994

Equity-Based Compensation - 102

Equity-Based Compensation - Summary of Equity-Based Compensation Expense related to Non-Vested RSUs (Details 3) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Service-Based RSUs
Equity-Based Compensation
Unrecognized compensation cost	$ 1,079
Weighted average period	1 year 1 month 9 days
Performance-Based RSUs
Equity-Based Compensation
Unrecognized compensation cost	$ 2,313
Weighted average period	1 year 7 months 15 days
RSUs
Equity-Based Compensation
Unrecognized compensation cost	$ 3,392
Weighted average period	1 year 5 months 15 days

Equity-Based Compensation - 103

Equity-Based Compensation - Summary of Status of Equity-Based Compensation Plans (Details 4)	Dec. 31, 2017shares
Performance Option [Member]
Summary of Status of Equity-Based Compensation Plans
Stock options outstanding, shares	295,000
2014 Plan
Summary of Status of Equity-Based Compensation Plans
Awards originally available to be granted	1,500,000
Stock options outstanding, shares	1,020,759
Restricted Stock Units, awarded and vested	176,221
RSUs outstanding, shares	725,759
Awards available to be granted	303,020
2014 Plan | Performance Option [Member]
Summary of Status of Equity-Based Compensation Plans
Stock options outstanding, shares	295,000
2009 Plan
Summary of Status of Equity-Based Compensation Plans
Awards originally available to be granted	3,400,000
Stock options outstanding, shares	122,600
RSUs outstanding, shares	122,600
Awards available to be granted	0
2009 Plan | Performance Option [Member]
Summary of Status of Equity-Based Compensation Plans
Stock options outstanding, shares	0
2004 Plan
Summary of Status of Equity-Based Compensation Plans
Awards originally available to be granted	6,500,000
Stock options outstanding, shares	57,391
RSUs outstanding, shares	57,391
Awards available to be granted	0
2004 Plan | Performance Option [Member]
Summary of Status of Equity-Based Compensation Plans
Stock options outstanding, shares	0
Directors' Plan
Summary of Status of Equity-Based Compensation Plans
Stock options outstanding, shares	9,620
RSUs outstanding, shares	9,620
Awards available to be granted	0
Directors' Plan | Performance Option [Member]
Summary of Status of Equity-Based Compensation Plans
Stock options outstanding, shares	0

Equity-Based Compensation - 104

Equity-Based Compensation - Summary of Status of Stock Options (Details 5) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Options
Additional Disclosure Status of Stock Options
Weighted average remaining contractual life	0 years
Share Based Compensation Arrangement By Share Based Payment Award Options Maximum Contractual Term	10 years
Employee Service Share Based Compensation Awards Stock Options Outstanding	0	0
Performance Option [Member]
Summary of Status of Stock Options
Outstanding, Options at end of period, shares	295,000
Weighted- Average Exercise Price
Exercisable, Weighted - Average Exercise Price at end of period	$ 18.37
Additional Disclosure Status of Stock Options
Share Based Compensation Arrangement By Share Based Payment Award Options Maximum Contractual Term	5 years

Equity-Based Compensation - 105

Equity-Based Compensation - Summary of Service-Based Restricted Stock Units (Details 6) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding
Outstanding at end of year, units	271,305
Weighted Average Grant Date Fair Value
End of year, Weighted-average Grant-Date Fair Value	$ 18.77
Fair value of RSU's vested	$ 5,471	$ 4,959	$ 2,803
Directors' Plan
Summary of Service-Based Restricted Stock Units
Nonvested at end of period, RSUs, shares	9,620
RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding
Outstanding at beginning of year, units	554,478
Granted, units	57,740
Released, units	(201,918)
Forfeited, units	(10,953)
Outstanding at end of year, units	399,347	554,478
Weighted Average Grant Date Fair Value
Beginning of year, Weighted-average Grant-Date Fair Value	$ 13.37
Granted, Weighted-average Grant-Date Fair Value	24.32	$ 15.07	$ 17.31
Converted, Weighted-average Grant-Date Fair Value	13.85
Forfeited, Weighted-average Grant-Date Fair Value	17.11
End of year, Weighted-average Grant-Date Fair Value	14.60	$ 13.37
Convertible at end of period, Weighted-average Grant-Date Fair Value	$ 12.48
Released at end of period, RSUs	259,811
Weighted Average Remaining Contractual Term	24 years 6 months 28 days
Released, Weighted average remaining contractual life	33 years 10 months 18 days
Aggregate intrinsic value, outstanding value	$ 10,283
Released Aggregate Intrinsic Value	6,690
Intrinsic value of RSU's converted	$ 4,485	$ 1,520	$ 2,933
Nonvested RSUs
Summary of Service-Based Restricted Stock Units
Nonvested at beginning of the year, RSUs, shares	251,245
Granted, RSUs	57,740
Vested, RSUs	(158,496)
Forfeited, RSUs	(10,953)
Nonvested at end of period, RSUs, shares	139,536	251,245
Weighted Average Grant Date Fair Value
Nonvested at beginning of year, Weighted-average Grant-Date Fair Value	$ 15.81
Granted, Weighted-average Grant-Date Fair Value	24.32
Converted, Weighted-average Grant-Date Fair Value	16.40
Forfeited, Weighted-average Grant-Date Fair Value	17.11
Nonvested at end of period, Weighted-average Grant-Date Fair Value	$ 18.56	$ 15.81

Equity-Based Compensation - Sch

Equity-Based Compensation - Schedule of Performance-Based RSUs (Details 7) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2017	Feb. 09, 2017	Feb. 16, 2016	Feb. 05, 2015
Weighted Average Grant Date Fair Value
End of year, Weighted-average Grant-Date Fair Value	$ 18.77
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	271,305
Performance-Based RSUs
Weighted Average Grant Date Fair Value
Beginning of year, Weighted-average Grant-Date Fair Value	$ 16.48
Granted, Weighted-average Grant-Date Fair Value	23.83
Converted, Weighted-average Grant-Date Fair Value	21.66
Forfeited, Weighted-average Grant-Date Fair Value	22.56
End of year, Weighted-average Grant-Date Fair Value		$ 16.48
Convertible at end of period, Weighted-average Grant-Date Fair Value	0
Target Based Vesting of Performance Based RSUs weighted average grant date fair value	$ 21.66
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number		201,900
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	123,919
Target based Vesting of performance-based restricted stock unit	15,285
Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Converted	(43,275)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(26,524)
Released at end of period, RSUs	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Weighted Average Remaining Contractual Term	1 year 7 months 15 days
Aggregate intrinsic value, outstanding value	$ 6,986
Shared Based Compensation Maximum Potential Awards	501,941		8,000	143,592	185,680	124,000
Target Units Outstanding	271,305		4,000	71,796	92,840	62,000
Convertible Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Aggregate Intrinsic Value	$ 0
Performance-Based Operating Income RSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Shared Based Compensation Maximum Potential Awards				40,669
Target Units Outstanding				40,669

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Financial Liability Measured at Fair Value on a Recurring Basis (Details 2) - Designated as Hedging Instrument - Cash Flow Hedge - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest Rate Swap
Recurring financial liability that was measured at carrying value
Interest rate swap - cash flow hedge		$ (753)	$ 768
Interest rate swap - cash flow hedge, loss	$ 37	(928)
Foreign currency hedges
Recurring financial liability that was measured at carrying value
Interest rate swap - cash flow hedge	742	601	$ 0
Interest rate swap - cash flow hedge, loss		18
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness	(38)
Fair Value, Measurements, Recurring | Interest Rate Swap
Recurring financial liability that was measured at carrying value
Interest rate swap - cash flow hedge	971	753
Fair Value, Measurements, Recurring | Foreign currency hedges
Recurring financial liability that was measured at carrying value
Interest rate swap - cash flow hedge	(742)	(601)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest Rate Swap
Recurring financial liability that was measured at carrying value
Interest rate swap - cash flow hedge	971
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign currency hedges
Recurring financial liability that was measured at carrying value
Interest rate swap - cash flow hedge	$ (742)
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Interest Rate Swap
Recurring financial liability that was measured at carrying value
Interest rate swap - cash flow hedge		753
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Foreign currency hedges
Recurring financial liability that was measured at carrying value
Interest rate swap - cash flow hedge		$ (601)

Fair Value Measurements - Recon

Fair Value Measurements - Reconciliation of Recurring Financial Liability Related to Interest Rate Swaps (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Cost of Hedge Net of Cash Received	$ (132)
Reconciliation of the recurring financial liability related to interest rate swaps
Derivative, Cash Received on Hedge		$ 54
Total gains/(losses) for the period:
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	(94)	36	$ 0
Foreign currency hedges | Designated as Hedging Instrument | Cash Flow Hedge
Reconciliation of the recurring financial liability related to interest rate swaps
Beginning balance	(601)	0
Total gains/(losses) for the period:
Included in earnings		(18)
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	38	(18)
Included in other comprehensive earnings	(47)	(637)
Ending balance	(742)	(601)	0
Interest Rate Swap | Designated as Hedging Instrument | Cash Flow Hedge
Reconciliation of the recurring financial liability related to interest rate swaps
Beginning balance	753	(768)
Total gains/(losses) for the period:
Included in earnings	(37)	928
Included in other comprehensive earnings	218	593
Ending balance		$ 753	$ (768)
Derivative Asset	$ (971)

Income Taxes - Earnings Before

Income Taxes - Earnings Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings before income taxes
Earnings before income taxes	$ 40,253	$ 57,245	$ 12,261
U.S.
Earnings before income taxes
Earnings before income taxes	9,315	25,746	(141)
Non-U.S.
Earnings before income taxes
Earnings before income taxes	$ 30,938	$ 31,499	$ 12,402

Income Taxes - Significant Comp

Income Taxes - Significant Components of Income Tax Provision/(Benefit) (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
U.S.	$ 1,635	$ (1,312)	$ 329
Non-U.S.	7,150	13,729	12,482
Total Current	8,785	12,417	12,811
Deferred:
U.S.	17,597	13,245	(15,795)
Non-U.S.	(577)	(2,797)	8,291
Total Deferred	17,020	10,448	(7,504)
Total provision for income taxes	$ 25,805	$ 22,865	$ 5,307

Income Taxes - Significant C111

Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details 3) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Significant components of deferred tax assets and liabilities
Post-retirement benefits	$ 1,160	$ 1,798
Inventory reserves	1,128	1,834
Loss carry-forwards	5,401	7,279
Credit carry-forwards	10,793	22,743
Nondeductible accruals	7,062	11,629
Research expenditures	20,002	31,380
Stock compensation	1,803	2,681
Foreign exchange loss	1,373	1,780
Other	220	648
Gross deferred tax assets	48,942	81,772
Depreciation and amortization	9,819	9,960
Pensions	12,387	16,024
Subsidiaries' unremitted earnings	1,662	1,292
Gross deferred tax liabilities	23,868	27,276
Net deferred tax assets	25,074	54,496
Deferred tax asset valuation allowance	(8,182)	(11,024)
Total net deferred tax assets	$ 16,892	$ 43,472

Income Taxes - Current and Long

Income Taxes - Current and Long-Term Deferred Tax Assests and Liabilities (Details 4) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Non-current deferred tax assets	$ 20,694	$ 45,839
Non-current deferred tax liabilities	(3,802)	(2,367)
Total net deferred tax assets	16,892	43,472
Total net deferred tax assets	$ 16,892	$ 43,472

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details 5) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes
Deferred tax assets, operating loss carryforwards	$ 5,401,000	$ 7,279,000
Credit carry-forwards	10,793,000	22,743,000
Deferred tax asset valuation allowance	8,182,000	11,024,000
Foreign tax credit carry-forwards	3,711,000
Research and development credits	7,249,000
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	18,001,000
Foreign income tax expense	7,150,000	13,729,000	$ 12,482,000
Income tax provision on foreign earnings to be permanently reinvested outside US	370,000
Unrecognized tax benefits	7,306,000
Accrued for interest and penalties related to uncertain income tax	$ 2,596,000	$ 1,772,000
Maximum
Income Taxes
Open Tax Year	2,008
Minimum
Income Taxes
Open Tax Year	2,016
Non-U.S. | Income Tax Benefit
Income Taxes
Effects of change in accounting method			16,305,000
Non-U.S. | Operating Carry Forward
Income Taxes
Effects of change in accounting method			(8,214,000)
Non-U.S. | Foreign Tax Credit Carryforward
Income Taxes
Effects of change in accounting method			$ 24,519,000
U.S. Federal Tax and Jobs Act Estimate
Income Taxes
Deferred Federal, State and Local, Tax Expense (Benefit)	$ 6,267,000
Tax Adjustments, Settlements, and Unusual Provisions	$ 11,734,000
Foreign Tax Credit Carryforward | Maximum
Income Taxes
Tax Credit Carryforward, Expiration Date	Dec. 31, 2025
Foreign Tax Credit Carryforward | Minimum
Income Taxes
Tax Credit Carryforward, Expiration Date	Dec. 31, 2024
Research Tax Credit Carryforward [Member] | Maximum
Income Taxes
Tax Credit Carryforward, Expiration Date	Dec. 31, 2037
Research Tax Credit Carryforward [Member] | Minimum
Income Taxes
Tax Credit Carryforward, Expiration Date	Dec. 31, 2022

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Effective Income Taxes Rate (Details 6)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of effective income taxes rate
Taxes at the U.S. statutory rate	35.00%	35.00%	35.00%
State income taxes, net of federal income tax benefit	1.10%	1.40%	(0.10%)
Non-U.S. income taxed at rates different than the U.S. statutory rate	(9.00%)	(7.50%)	(16.70%)
Foreign source income, net of associated foreign tax credits	0.10%	5.30%	6.90%
Benefit of tax credits	(1.40%)	(1.00%)	(4.60%)
Non-deductible expenses	1.50%	0.70%	1.30%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent	(1.50%)	(0.80%)	0.00%
Adjustment to valuation allowances	(4.40%)	3.80%	37.80%
Benefit from prior period foreign tax credits	(0.00%)	(0.00%)	(133.00%)
Change in unrecognized tax benefits	2.00%	3.30%	59.50%
Impacts of unremitted foreign earnings	0.90%	0.60%	60.80%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	44.70%	0.00%	0.00%
Other	(4.90%)	(0.90%)	(3.60%)
Effective income tax rate	64.10%	39.90%	43.30%

Income Taxes - Reconciliatio115

Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details 7) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income Tax Provision For Undistributed Earnings Of Foreign Subsidiaries	$ 370
Reconciliation of the unrecognized tax benefits
Unrecognized tax benefits, beginning balance	12,347	$ 11,008
Increase related to current year tax positions	0	1,088
Increase related to prior year tax positions	1,290	251
Decrease related to settlements with taxing authorities	(6,331)	0
Unrecognized tax benefits, ending balance	$ 7,306	$ 12,347

Business Acquisitions - Narrati

Business Acquisitions - Narratives (Details) - USD ($) $ in Thousands

May 15, 2017

Mar. 11, 2016

Dec. 31, 2017

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2016

Sep. 30, 2016

Jun. 30, 2016

Mar. 31, 2016

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

Business Acquisition

Goodwill

$ 71,057

$ 61,744

$ 71,057

$ 61,744

$ 33,865

Cost of goods sold

282,562

256,251

255,201

Net Income (Loss) Attributable to Parent

$ (13,621)

$ 9,619

$ 9,966

$ 8,484

$ 8,310

$ 3,720

$ 14,487

$ 7,863

$ 14,448

$ 34,380

$ 6,954

CTG Advanced Materials, LLC [Member]

Business Acquisition

Acquired Finite-lived Intangible Asset, Residual Value

$ 35,427

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets

73,731

Business Acquisition, Goodwill, Expected Tax Deductible Amount

27,879

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets

4,215

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment

6,173

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets

37

Goodwill

27,879

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities

(668)

Finite-lived Intangible Assets Acquired

$ 35,427

Acquired Finite-lived Intangible Assets, Weighted Average Useful Life

14 years 9 months 20 days

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents

$ 4

Business Acquisition, Transaction Costs

804

Noliac A/S [Member]

Business Acquisition

Acquired Finite-lived Intangible Asset, Residual Value

$ 9,142

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets

22,266

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets

2,836

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment

580

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets

395

Goodwill

9,313

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities

(3,145)

Finite-lived Intangible Assets Acquired

$ 9,142

Acquired Finite-lived Intangible Assets, Weighted Average Useful Life

13 years 8 months

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents

$ 0

Business Acquisition, Transaction Costs

0

Developed Technology | CTG Advanced Materials, LLC [Member]

Business Acquisition

Finite-lived Intangible Assets Acquired

$ 23,730

Acquired Finite-lived Intangible Assets, Weighted Average Useful Life

15 years

Developed Technology | Noliac A/S [Member]

Business Acquisition

Finite-lived Intangible Assets Acquired

$ 7,581

Acquired Finite-lived Intangible Assets, Weighted Average Useful Life

15 years

Customer Relationships and Contracts | CTG Advanced Materials, LLC [Member]

Business Acquisition

Finite-lived Intangible Assets Acquired

$ 11,502

Acquired Finite-lived Intangible Assets, Weighted Average Useful Life

14 years 7 months 6 days

Customer Relationships and Contracts | Noliac A/S [Member]

Business Acquisition

Finite-lived Intangible Assets Acquired

$ 937

Acquired Finite-lived Intangible Assets, Weighted Average Useful Life

10 years

Technology and other intangibles | CTG Advanced Materials, LLC [Member]

Business Acquisition

Finite-lived Intangible Assets Acquired

$ 195

Acquired Finite-lived Intangible Assets, Weighted Average Useful Life

9 months 18 days

Technology and other intangibles | Noliac A/S [Member]

Business Acquisition

Finite-lived Intangible Assets Acquired

$ 624

Acquired Finite-lived Intangible Assets, Weighted Average Useful Life

3 years

Business Acquisitions - Net Ass

Business Acquisitions - Net Assets Acquired (Details) - USD ($) $ in Thousands	May 15, 2017	Mar. 11, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Combination, Recognized Identifiable Assets Acquired, Goodwill and Liabilities Assumed, Net
Goodwill			$ 71,057	$ 61,744	$ 33,865
Less fair value of liabilities acquired			$ (19,121)	$ (73,063)	$ (1,285)
Noliac A/S [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill and Liabilities Assumed, Net
Current assets	$ 2,836
Property, plant and equipment	580
Goodwill	9,313
Acquired Finite-lived Intangible Asset, Residual Value	9,142
Other assets	395
Fair value of assets acquired	22,266
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(3,145)
Less fair value of liabilities acquired	(19,121)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	$ 0
CTG Advanced Materials, LLC [Member]
Business Combinations - Schedule of Finite-Lived Intangible Assets [Abstract]
Business Acquisition, Goodwill, Expected Tax Deductible Amount		$ 27,879
Business Combination, Recognized Identifiable Assets Acquired, Goodwill and Liabilities Assumed, Net
Current assets		4,215
Property, plant and equipment		6,173
Goodwill		27,879
Acquired Finite-lived Intangible Asset, Residual Value		35,427
Other assets		37
Fair value of assets acquired		73,731
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		(668)
Less fair value of liabilities acquired		(73,063)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents		$ 4

Geographic Data - Schedule of F

Geographic Data - Schedule of Financial Information by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net Sales from continuing operations
Property, Plant and Equipment, Net	$ 88,247				$ 82,111				$ 88,247	$ 82,111
Net sales	110,910	$ 106,243	$ 105,686	$ 100,154	101,584	$ 99,697	$ 98,693	$ 96,705	422,993	396,679	$ 382,310
United States | Operating Segments
Net Sales from continuing operations
Property, Plant and Equipment, Net	45,354				42,488				45,354	42,488
Net sales									287,092	276,033	238,796
Singapore | Operating Segments
Net Sales from continuing operations
Net sales									5,596	6,668	8,379
China | Operating Segments
Net Sales from continuing operations
Property, Plant and Equipment, Net	32,464				33,013				32,464	33,013
Net sales									66,510	59,506	55,825
Canada | Operating Segments
Net Sales from continuing operations
Net sales									0	0	24,519
Czech Republic | Operating Segments
Net Sales from continuing operations
Property, Plant and Equipment, Net	5,518				2,634				5,518	2,634
Net sales									34,476	34,767	36,348
Other non-U.S. | Operating Segments
Net Sales from continuing operations
Property, Plant and Equipment, Net	$ 781				$ 652				781	652
Net sales									$ 29,319	$ 19,705	$ 18,443

Geographic Data - Schedule of R

Geographic Data - Schedule of Revenue by Geographic Areas (Details 2) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales Revenue, Goods, Net	$ 110,910	$ 106,243	$ 105,686	$ 100,154	$ 101,584	$ 99,697	$ 98,693	$ 96,705	$ 422,993	$ 396,679	$ 382,310
Property, Plant and Equipment, Net	88,247				82,111				88,247	82,111
United States | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales Revenue, Goods, Net									287,092	276,033	238,796
Property, Plant and Equipment, Net	45,354				42,488				45,354	42,488
China | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales Revenue, Goods, Net									66,510	59,506	55,825
Property, Plant and Equipment, Net	32,464				33,013				32,464	33,013
CANADA | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales Revenue, Goods, Net									0	0	24,519
United Kingdom | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, Plant and Equipment, Net	590				569				590	569
Taiwan | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, Plant and Equipment, Net	3,540				2,755				3,540	2,755
Czech Republic | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales Revenue, Goods, Net									34,476	34,767	36,348
Property, Plant and Equipment, Net	5,518				2,634				5,518	2,634
Other non-U.S | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales Revenue, Goods, Net									29,319	19,705	$ 18,443
Property, Plant and Equipment, Net	$ 781				$ 652				$ 781	$ 652

Quarterly Financial Data - Quar

Quarterly Financial Data - Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Selected Quarterly Financial Information
Net sales	$ 110,910	$ 106,243	$ 105,686	$ 100,154	$ 101,584	$ 99,697	$ 98,693	$ 96,705	$ 422,993	$ 396,679	$ 382,310
Gross margin	32,875	37,538	35,794	34,224	35,861	36,641	34,457	33,468	140,431	140,428	127,109
Operating earnings (loss)	(19)	(13,111)	(13,208)	(12,196)	(14,146)	(12,490)	(24,097)	(12,433)	(38,495)	(63,166)	(18,113)
Net (loss) earnings	$ (13,621)	$ 9,619	$ 9,966	$ 8,484	$ 8,310	$ 3,720	$ 14,487	$ 7,863	$ 14,448	$ 34,380	$ 6,954
Basic earnings per share (usd per share)	$ (0.41)	$ 0.29	$ 0.30	$ 0.26	$ 0.25	$ 0.11	$ 0.44	$ 0.24	$ 0.44	$ 1.05	$ 0.21
Diluted earnings per share (usd per share)	$ (0.41)	$ 0.29	$ 0.30	$ 0.25	$ 0.25	$ 0.11	$ 0.44	$ 0.24	$ 0.43	$ 1.03	$ 0.21

Schedule II - Valuation and 121

Schedule II - Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Valuation and Qualifying Accounts
Balance at Beginning of Period	$ 170	$ 133	$ 100
Charged/ (Credit) to Expense	(248)	(44)	(33)
Charged to Other Accounts	9	0	0
Deductions	(70)	(7)	0
Balance at End of Period	$ 357	$ 170	$ 133