Rogers (ROG) 10-Q 1 Aug 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 25, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	ROGERS CORP
Trading Symbol	ROG
Entity Central Index Key	84,748
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		18,385,943

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Net sales	$ 214,675	$ 201,424	$ 429,286	$ 405,252
Cost of sales	138,003	120,878	276,007	244,356
Gross margin	76,672	80,546	153,279	160,896
Selling, general and administrative expenses	42,540	40,012	83,137	74,580
Research and development expenses	8,750	7,141	16,884	14,102
Restructuring and impairment charges	541	1,079	963	1,805
Gain (Loss) on Disposition of Assets	383	0
Other operating (income) expense, net		0	(3,974)	(942)
Operating income	25,224	32,314	56,269	71,351
Equity income in unconsolidated joint ventures	1,804	966	2,811	1,976
Other income (expense), net	(34)	260	32	1,379
Interest expense, net	(1,292)	(1,947)	(2,503)	(3,195)
Income before income tax expense	25,702	31,593	56,609	71,511
Income tax expense	8,373	10,697	13,144	23,583
Net income	$ 17,329	$ 20,896	$ 43,465	$ 47,928
Basic earnings per share (in dollars per share)	$ 0.94	$ 1.15	$ 2.37	$ 2.65
Diluted earnings per share (in dollars per share)	$ 0.93	$ 1.13	$ 2.33	$ 2.60
Shares used in computing:
Basic earnings per share (shares)	18,389	18,140	18,338	18,098
Diluted earnings per share (shares)	18,660	18,547	18,635	18,460

CONDENSED CONSOLIDATED STATEME3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 17,329	$ 20,896	$ 43,465	$ 47,928
Foreign currency translation adjustment	(15,294)	12,591	(8,293)	16,730
Derivative instruments designated as cash flow hedges:
Unrealized gain (loss) on derivative instruments held at period end, net of tax (Note 6)	320	(321)	1,097	(435)
Unrealized loss reclassified into earnings (Note 6)	0	107	0	107
Accumulated other comprehensive loss pension and post-retirement benefits:
Actuarial net gain incurred in fiscal year, net of tax (Note 6)	44	334	87	334
Pension and postretirement benefit plans reclassified into earnings:
Amortization of loss, net of tax (Note 6)	0	6	0	36
Other comprehensive income (loss)	(14,930)	12,717	(7,109)	16,772
Comprehensive income	$ 2,399	$ 33,613	$ 36,356	$ 64,700

CONDENSED CONSOLIDATED STATEME4

CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 174,700	$ 181,159
Accounts receivable, less allowance for doubtful accounts of $1,284 and $1,525	148,727	140,562
Contract assets	21,933	0
Inventories	117,739	112,557
Prepaid income taxes	2,732	3,087
Current portion of asbestos-related insurance receivables	5,682	5,682
Assets held for sale	381	896
Other current assets	13,535	10,580
Total current assets	485,429	454,523
Property, plant and equipment, net of accumulated depreciation of $300,416 and $289,909	184,478	179,611
Investments in unconsolidated joint ventures	19,411	18,324
Deferred income taxes	3,501	6,008
Goodwill	234,287	237,107
Other intangible assets, net of amortization	152,009	160,278
Asbestos-related insurance receivables	63,511	63,511
Other long-term assets	5,503	5,772
Total assets	1,148,129	1,125,134
Current liabilities
Accounts payable	37,299	36,116
Accrued employee benefits and compensation	26,081	39,394
Accrued income taxes payable	3,987	6,408
Current portion of capital lease obligations	600	579
Current portion of asbestos-related liabilities	5,682	5,682
Other accrued liabilities	25,095	25,629
Total current liabilities	98,744	113,808
Borrowings under credit facility	130,982	130,982
Non-current portion of capital lease obligations	5,404	5,873
Pension liability	8,720	8,720
Retiree health care and life insurance benefits	1,685	1,685
Asbestos-related liabilities	70,056	70,500
Non-current income tax	9,755	12,823
Deferred income taxes	13,879	10,706
Other long-term liabilities	4,119	3,464
Commitments and contingencies (Note 14)
Shareholders’ equity
Capital Stock - $1 par value; 50,000 authorized shares; 18,380 and 18,255 shares issued and outstanding	18,380	18,255
Additional paid-in capital	126,452	128,933
Retained earnings	732,217	684,540
Accumulated other comprehensive loss	(72,264)	(65,155)
Total shareholders' equity	804,785	766,573
Total liabilities and shareholders' equity	$ 1,148,129	$ 1,125,134

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 1,284	$ 1,525
Property, plant and equipment, net of accumulated depreciation	$ 300,416	$ 289,909
Capital Stock, par value (in dollars per share)	$ 1	$ 1
Capital Stock, authorized shares (shares)	50,000,000	50,000,000
Capital Stock, shares outstanding (shares)	18,380,000	18,255,000

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating Activities:
Net income	$ 43,465	$ 47,928
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	22,084	21,536
Equity compensation expense	5,814	5,327
Deferred income taxes	3,879	4,813
Equity in undistributed income of unconsolidated joint ventures	(2,811)	(1,976)
Dividends received from unconsolidated joint ventures	1,809	616
Pension and postretirement benefits	(796)	(794)
Realized (gain) loss from sale of property, plant and equipment	383	942
Bad debt expense	(190)	61
Proceeds from insurance related to operations	0	826
Changes in operating assets and liabilities, excluding effects of acquisitions:
Accounts receivable	(9,446)	(13,220)
Contract assets	(21,933)	0
Inventories	(6,489)	(6,464)
Pension and postretirement benefit contributions	(338)	(147)
Other current assets	(1,299)	(1,991)
Accounts payable and other accrued expenses	(13,835)	7,213
Other, net	3,287	1,703
Net cash provided by operating activities	22,818	64,489
Investing Activities:
Acquisition of business, net of cash received	0	(60,191)
Capital expenditures	(20,177)	(9,696)
Proceeds from insurance claims	0	922
Proceeds from the sale of property, plant and equipment, net	1,027	1,641
Net cash used in investing activities	(19,150)	(67,324)
Financing Activities:
Line of credit issuance costs	0	(1,169)
Repayment of debt principal and capital lease obligations	(291)	(50,178)
Repurchases of capital stock	(2,999)	0
Proceeds from the exercise of stock options, net	698	1,905
Payments of taxes related to net share settlement of equity awards	(6,427)	(2,617)
Proceeds from issuance of shares to employee stock purchase plan	558	422
Net cash used in financing activities	(8,461)	(51,637)
Effect of exchange rate fluctuations on cash	(1,666)	4,017
Net decrease in cash and cash equivalents	(6,459)	(50,455)
Cash and cash equivalents at beginning of period	181,159	227,767
Cash and cash equivalents at end of period	174,700	177,312
Supplemental Disclosures:
Interest, net of amounts capitalized	2,631	3,085
Income taxes	$ 14,040	$ 13,913

CONDENSED CONSOLIDATED STATEME7

CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Capital Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance, Beginning of Period at Dec. 31, 2016					$ (92,262)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 47,928
Other comprehensive income (loss)	16,772
Balance, End of Period at Jun. 30, 2017					(75,490)
Balance, Beginning of Period at Dec. 31, 2017	766,573	$ 18,255	$ 128,933	$ 684,540	(65,155)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	43,465	0	0	43,465	0
Other comprehensive income (loss)	(7,109)	0	0	0	(7,109)
Stock options exercised	698	18	680	0	0
Stock issued to directors	0	11	(11)	0	0
Shares issued for employees stock purchase plan	558	6	552	0	0
Shares issued for vested restricted stock units, net of cancellations for tax withholding	(6,427)	113	(6,540)	0	0
Value of capital stock repurchased	(2,999)	(23)	(2,976)	0	0
Cumulative-effect adjustment of revenue recognition ASC 606	4,212	0	0	4,212	0
Equity compensation expense	5,814	0	5,814	0	0
Balance, End of Period at Jun. 30, 2018	$ 804,785	$ 18,380	$ 126,452	$ 732,217	$ (72,264)

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation As used herein, the terms “Company,” “Rogers,” “we,” “us,” “our” and similar terms mean Rogers Corporation and its subsidiaries, unless the context indicates otherwise. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) for interim financial information. Accordingly, these statements do not include all of the information and footnotes required by GAAP for complete financial statements. In our opinion, the accompanying condensed consolidated financial statements include all normal recurring adjustments necessary for their fair presentation in accordance with GAAP. All significant intercompany transactions have been eliminated. On January 1, 2018, the Company adopted ASU 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Post-Retirement Benefit Cost . Upon adoption, the Company reclassified $0.4 million and $0.8 million in net periodic pension benefits from Selling, general and administrative expenses to Other income (expense), net for the three and six months ended June 30, 2017 , respectively. See Note 21, “Recent Accounting Standards” for further information. Interim results are not necessarily indicative of results for a full year. For further information regarding our accounting policies, refer to the audited consolidated financial statements and footnotes thereto included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2017 .

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The accounting guidance for fair value measurements establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value: • Level 1 – Quoted prices in active markets for identical assets or liabilities. • Level 2 – Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. • Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. From time to time we enter into various instruments that require fair value measurement, including foreign currency contracts, copper derivative contracts and interest rate swaps. Derivative instruments measured at fair value on a recurring basis, categorized by the level of inputs used in the valuation, consist of: Derivative Instruments at Fair Value as of June 30, 2018 (Dollars in thousands) Level 1 Level 2 Level 3 Total Foreign currency contracts $ — $ 118 $ — $ 118 Copper derivative contracts $ — $ 827 $ — $ 827 Interest rate swap $ — $ 1,439 $ — $ 1,439 Derivative Instruments at Fair Value as of December 31, 2017 (Dollars in thousands) Level 1 Level 2 Level 3 Total Foreign currency contracts $ — $ (396 ) $ — $ (396 ) Copper derivative contracts $ — $ 2,016 $ — $ 2,016 Interest rate swap $ — $ 41 $ — $ 41

Hedging Transactions and Deriva

Hedging Transactions and Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Hedging Transactions and Derivative Financial Instruments	Hedging Transactions and Derivative Financial Instruments We are exposed to certain risks related to our ongoing business operations. The primary risks being managed through our use of derivative instruments are foreign currency exchange rate risk and commodity pricing risk (primarily related to copper). During 2017, we entered into an interest rate swap to hedge interest rate risk. We do not use derivative financial instruments for trading or speculative purposes. The valuation of derivative contracts used to manage each of these risks is described below: • Foreign Currency - The fair value of any foreign currency option derivative is based upon valuation models applied to current market information such as strike price, spot rate, maturity date and volatility, and by reference to market values resulting from an over-the-counter market or obtaining market data for similar instruments with similar characteristics. • Commodity - The fair value of copper derivatives is computed using a combination of intrinsic and time value valuation models. The intrinsic valuation model reflects the difference between the strike price of the underlying copper derivative instrument and the current prevailing copper prices in an over-the-counter market at period end. The time value valuation model incorporates the constant changes in the price of the underlying copper derivative instrument, the time value of money, the underlying copper derivative instrument’s strike price and the remaining time to the underlying copper derivative instrument’s expiration date from the period end date. Overall, fair value is a function of five primary variables: price of the underlying instrument, time to expiration, strike price, interest rate, and volatility. • Interest Rates - The fair value of interest rate swap instruments is derived by comparing the present value of the interest rate forward curve against the present value of the swap rate, relative to the notional amount of the swap. The net value represents the estimated amount we would receive or pay to terminate the agreements. Settlement amounts for an “in the money” swap would be adjusted down to compensate the counterparty for cost of funds, and the adjustment is directly related to the counterparties’ credit ratings. The guidance for the accounting and disclosure of derivatives and hedging transactions requires companies to recognize all of their derivative instruments as either assets or liabilities at fair value in the statements of financial position. The accounting for changes in the fair value (i.e., gains or losses) of a derivative instrument depends on whether it has been designated and qualifies for hedge accounting treatment as defined under the applicable accounting guidance. For derivative instruments that are designated and qualify for hedge accounting treatment as cash flow hedges (i.e., hedging the exposure to variability in expected future cash flows that is attributable to a particular risk), the effective portion of the gain or loss on the derivative instrument is reported as a component of other comprehensive income (loss). This gain or loss is reclassified into earnings in the same line item of the condensed consolidated statements of operations associated with the forecasted transaction and in the same period or periods during which the hedged transaction affects earnings. As of June 30, 2018 , only our interest rate swap qualified for hedge accounting treatment as a cash flow hedge. For the six months ended June 30, 2018 and 2017 , the hedge was highly effective. Foreign Currency During the three months ended June 30, 2018 , we entered into Korean Won, Japanese Yen, Euro, Hungarian Forint and Chinese Renminbi forward contracts. We entered into these foreign currency forward contracts to mitigate certain global transactional exposures. These contracts do not qualify for hedge accounting treatment. As a result, any fair value adjustments required on these contracts are recorded in “Other income (expense), net” in our condensed consolidated statements of operations. As of June 30, 2018 the notional values of these foreign currency forward contracts were: Notional Values of Foreign Currency Derivatives KRW/USD ₩ 3,454,400,000 JPY/EUR ¥ 335,000,000 EUR/USD € 12,822,491 EUR/HUF € 1,132,697 USD/CNY $ 10,637,837 Commodity We currently have 25 outstanding contracts to hedge exposure related to the purchase of copper in our Power Electronics Solutions (PES) and Advanced Connectivity Solutions (ACS) operating segments. These contracts are held with financial institutions and are intended to offset rising copper prices. These contracts provide some coverage over the forecasted 2018 and 2019 monthly copper exposure and do not qualify for hedge accounting treatment. As a result, any fair value adjustments required on these contracts are recorded in “Other income (expense), net” in our condensed consolidated statements of operations in the period in which the adjustment occurs. The notional values of our copper contracts outstanding as of June 30, 2018 were: Volume of Copper Derivatives July 2018 - September 2018 153 metric tons per month October 2018 - December 2018 153 metric tons per month January 2019 - March 2019 189 metric tons per month April 2019 - June 2019 188 metric tons per month July 2019 - September 2019 145 metric tons per month Interest Rates In 2017, we entered into an interest rate swap to hedge the variable interest rate on $75.0 million of our $450.0 million revolving credit facility. This transaction has been designated as a cash flow hedge and qualifies for hedge accounting treatment. See Note 12, “Debt” for further discussion regarding the credit facility. Effects on Statements of Operations and of Comprehensive Income (Loss): (Dollars in thousands) The Effect of Current Derivative Instruments on the Financial Statements for the period ended June 30, 2018 Fair Values of Derivative Instruments as of June 30, 2018 Gain (Loss) Other Assets (Liabilities) Foreign Exchange Contracts Location Three Months Ended Six Months Ended Contracts not designated as hedging instruments Other income (expense), net $ (60 ) $ (124 ) $ 118 Copper Derivatives Contracts not designated as hedging instruments Other income (expense), net $ (363 ) $ (1,185 ) $ 827 Interest Rate Swap Contracts designated as hedging instruments Other comprehensive income (loss) $ 410 $ 1,399 $ 1,439 (Dollars in thousands) The Effect of Current Derivative Instruments on the Financial Statements for the period ended June 30, 2017 Fair Values of Derivative Instruments as of June 30, 2017 Gain (Loss) Other Assets (Liabilities) Foreign Exchange Contracts Location Three Months Ended Six Months Ended Contracts not designated as hedging instruments Other income (expense), net $ (312 ) $ (291 ) $ (312 ) Copper Derivatives Contracts not designated as hedging instruments Other income (expense), net $ 71 $ 205 $ 1,331 Interest Rate Swap Contracts designated as hedging instruments Other comprehensive income (loss) $ (335 ) $ (515 ) $ (622 )

Inventories

Inventories	6 Months Ended
	Jun. 30, 2018
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories are valued at the lower of cost or market. Inventories were as follows at the end of the periods noted below: (Dollars in thousands) June 30, 2018 December 31, 2017 Raw materials $ 51,370 $ 43,092 Work-in-process 29,150 28,133 Finished goods 37,219 41,332 Total inventories $ 117,739 $ 112,557

Acquisitions

Acquisitions	6 Months Ended
	Jun. 30, 2018
Business Combinations [Abstract]
Acquisitions	Acquisitions Diversified Silicone Products On January 6, 2017, we acquired the principal operating assets of Diversified Silicone Products, Inc. (DSP), pursuant to the terms of the Asset Purchase Agreement by and among the Company, DSP and the principal shareholders of DSP (the Purchase Agreement). Pursuant to the terms of the Purchase Agreement, we acquired certain assets and assumed certain liabilities of DSP for a total purchase price of approximately $60.2 million . We used borrowings of $30.0 million under our credit facility in addition to cash on hand to fund the acquisition. DSP is a custom silicone product development and manufacturing business and expands the portfolio of our Elastomeric Material Solutions (EMS) operating segment in cellular sponge and specialty extruded silicone profile technologies, while strengthening existing expertise in precision-calendered silicone and silicone formulating and compounding. The results of DSP have been included in our condensed consolidated financial statements only for the periods subsequent to the completion of our acquisition on January 6, 2017.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	6 Months Ended
	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss The changes in accumulated other comprehensive loss by component for the six months ended June 30, 2018 and 2017 were as follows: (Dollars and accompanying footnotes in thousands) Foreign currency translation adjustments Funded status of pension plans and other postretirement benefits (1) Unrealized gain (loss) on derivative instruments (2) Total Beginning Balance December 31, 2017 $ (17,983 ) $ (47,198 ) $ 26 $ (65,155 ) Other comprehensive income (loss) before reclassifications (8,293 ) — 1,097 (7,196 ) Amounts reclassified from accumulated other comprehensive loss — 87 — 87 Net current-period other comprehensive income (loss) (8,293 ) 87 1,097 (7,109 ) Ending Balance June 30, 2018 $ (26,276 ) $ (47,111 ) $ 1,123 $ (72,264 ) Beginning Balance December 31, 2016 $ (46,446 ) $ (45,816 ) $ — $ (92,262 ) Other comprehensive income (loss) before reclassifications 16,730 — (435 ) 16,295 Actuarial net gain incurred in the fiscal year — 334 — 334 Amounts reclassified from accumulated other comprehensive loss — 36 107 143 Net current-period other comprehensive income (loss) 16,730 370 (328 ) 16,772 Ending Balance June 30, 2017 $ (29,716 ) $ (45,446 ) $ (328 ) $ (75,490 ) (1) Net of taxes of $9,536 and $9,563 as of June 30, 2018 and December 31, 2017 , respectively. Net of taxes of $8,961 and $9,160 as of June 30, 2017 and December 31, 2016 , respectively. (2) Net of taxes of $316 and $15 as of June 30, 2018 and December 31, 2017 , respectively. Net of taxes of $187 and $0 as of June 30, 2017 and December 31, 2016 , respectively.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following table sets forth the computation of basic and diluted earnings per share for the periods indicated: (Dollars and shares in thousands, except per share amounts) Three Months Ended Six Months Ended June 30, 2018 June 30, 2017 June 30, 2018 June 30, 2017 Numerator: Net income $ 17,329 $ 20,896 $ 43,465 $ 47,928 Denominator: Weighted-average shares outstanding - basic 18,389 18,140 18,338 18,098 Effect of dilutive shares 271 407 297 362 Weighted-average shares outstanding - diluted 18,660 18,547 18,635 18,460 Basic earnings per share $ 0.94 $ 1.15 $ 2.37 $ 2.65 Diluted earnings per share $ 0.93 $ 1.13 $ 2.33 $ 2.60 Certain potential options to purchase shares may be excluded from the calculation of diluted weighted-average shares outstanding where their exercise price is greater than the average market price of our capital stock during the relevant reporting period. For the three months ended June 30, 2018 , 27,145 shares were excluded. For the three months ended June 30, 2017 , no shares were excluded.

Equity Compensation

Equity Compensation	6 Months Ended
	Jun. 30, 2018
Share-based Compensation [Abstract]
Equity Compensation	Compensation Performance-Based Restricted Stock Units As of June 30, 2018 , we had performance-based restricted stock units from 2016, 2017 and 2018 outstanding. These awards generally cliff vest at the end of a three year measurement period. However, employees whose employment terminates during the measurement period due to death, disability, or, in certain cases, retirement may receive a pro-rata payout based on the number of days they were employed during the measurement period. Participants are eligible to be awarded shares ranging from 0% to 200% of the original award amount, based on certain defined performance measures. The 2016, 2017 and 2018 awards have one measurement criteria: the three year total shareholder return (TSR) on the performance of our capital stock as compared to that of a specified group of peer companies. The TSR measurement criteria of the awards is considered a market condition. As such, the fair value of this measurement criteria was determined on the grant date using a Monte Carlo simulation valuation model. We recognize compensation expense on all of these awards on a straight-line basis over the vesting period with no changes for final projected payout of the awards. We account for forfeitures as they occur. Below were the assumptions used in the Monte Carlo calculation: June 30, 2018 June 30, 2017 Expected volatility 34.8% 33.6% Expected term (in years) 3.0 3.0 Risk-free interest rate 2.28% 1.38% Expected volatility – In determining expected volatility, we have considered a number of factors, including historical volatility. Expected term – We use the measurement period of the award to determine the expected term assumption for the Monte Carlo simulation valuation model. Risk-free interest rate – We use an implied “spot rate” yield on U.S. Treasury Constant Maturity rates as of the grant date for our assumption of the risk-free interest rate. Expected dividend yield – We do not currently pay dividends on our capital stock; therefore, a dividend yield of 0% was used in the Monte Carlo simulation valuation model. The following table summarizes the change in number of performance-based restricted stock units outstanding for the six months ended June 30, 2018 : Performance-Based Restricted Stock Units Awards outstanding at December 31, 2017 169,202 Awards granted 72,160 Stock issued (81,230 ) Awards forfeited (17,489 ) Awards outstanding at June 30, 2018 142,643 During the three and six months ended June 30, 2018 , we recognized compensation expense for performance-based restricted stock units of approximately $0.8 million and $1.8 million , respectively. During the three and six months ended June 30, 2017 , we recognized compensation expense for performance-based restricted stock units of approximately $1.6 million and $1.5 million , respectively. Time-Based Restricted Stock Units As of June 30, 2018, we had time-based restricted stock unit awards from 2014, 2015, 2016, 2017 and 2018 outstanding. The 2015, 2016, 2017 and 2018 grants all ratably vest on the first, second and third anniversaries of the original grant date. The remaining outstanding 2014 grants cliff vest on December 17, 2018, the fourth anniversary of the original grant date. Each restricted stock unit represents a right to receive one share of the Rogers’ capital stock at the end of the vesting period. The fair value of the award is determined by the market value of the underlying stock price at the grant date. We recognize compensation expense on all of these awards on a straight-line basis over the vesting period. We account for forfeitures as they occur. The following table summarizes the change in number of time-based restricted stock units outstanding for the six months ended June 30, 2018 : Time-Based Restricted Stock Units Awards outstanding at December 31, 2017 173,331 Awards granted 41,310 Stock issued (77,513 ) Awards forfeited (14,627 ) Awards outstanding at June 30, 2018 122,501 During the three and six months ended June 30, 2018 we recognized compensation expense for time-based restricted stock units of approximately $1.3 million and $2.9 million , respectively. During the three and six months ended June 30, 2017 we recognized compensation expense for time-based restricted stock units of approximately $1.7 million and $2.7 million , respectively. Deferred Stock Units We grant deferred stock units to non-management directors. These awards are fully vested on the date of grant and the related shares are generally issued on the 13-month anniversary of the grant date unless the individual elects to defer the receipt of those shares. Each deferred stock unit results in the issuance of one share of Rogers’ capital stock. The grant of deferred stock units is typically done annually during the second quarter of each year. The fair value of the award is determined by the market value of the underlying stock price at the grant date. The following table summarizes the change in number of deferred stock units outstanding during the six months ended June 30, 2018 : Deferred Stock Units Awards outstanding at December 31, 2017 9,250 Awards granted 8,400 Stock issued (8,400 ) Awards outstanding at June 30, 2018 9,250 During each of the three- and six-month periods ended June 30, 2018 and 2017 , we recognized compensation expense associated with the deferred stock units of $0.9 million . Stock Options Stock options have been granted under various equity compensation plans, and they generally became exercisable in one-third increments on the second, third and fourth anniversaries of the grant dates. The maximum contractual term for all options was normally ten years . We used the Black-Scholes option-pricing model to calculate the grant-date fair value of an option. We have no t granted any stock options since the first quarter of 2012. The following table summarizes the change in number of stock options outstanding for the six months ended June 30, 2018 : Options Outstanding Weighted- Average Exercise Price Per Share Weighted-Average Remaining Contractual Life in Years Aggregate Intrinsic Value Outstanding at December 31, 2017 33,283 $ 36.40 2.2 $ 4,177,655 Options exercised (17,683 ) $ 39.48 Options forfeited — $ — Options outstanding at June 30, 2018 15,600 $ 32.91 2.5 $ 1,225,308 Options exercisable at June 30, 2018 15,600 $ 32.91 2.5 $ 1,225,308 Options vested at June 30, 2018 15,600 $ 32.91 2.5 $ 1,225,308 During the six months ended June 30, 2018 , the total intrinsic value of options exercised (i.e., the difference between the market price at time of exercise and the price paid by the individual to exercise the options) was $2.0 million , and the total amount of cash received from the exercise of these options was $0.7 million . Employee Stock Purchase Plan We have an employee stock purchase plan (ESPP) that allows eligible employees to purchase, through payroll deductions, shares of our capital stock at a discount to fair market value. The ESPP has two six month offering periods each year, the first beginning in January and ending in June and the second beginning in July and ending in December. The ESPP contains a look-back feature that allows the employee to acquire shares of our capital stock at a 15% discount from the underlying market price at the beginning or end of the applicable period, whichever is lower. We recognize compensation expense on this plan ratably over the offering period based on the fair value of the anticipated number of shares that will be issued at the end of each offering period. Compensation expense is adjusted at the end of each offering period for the actual number of shares issued. Fair value is determined based on two factors: (i) the 15% discount on the underlying stock’s market value on the first day of the applicable offering period and (ii) the fair value of the look-back feature determined by using the Black-Scholes option-pricing model. We recognized approximately $0.1 million of compensation expense associated with the plan in each of the three-month periods ended June 30, 2018 and 2017 and approximately $0.2 million of compensation expense associated with each of the six-month periods ended June 30, 2018 and 2017 .

Pension Benefits and Other Post

Pension Benefits and Other Postretirement Benefit Plans	6 Months Ended
	Jun. 30, 2018
Defined Benefit Plan [Abstract]
Pension Benefit and Other Postretirement Benefit Plans	Pension Benefits and Other Postretirement Benefit Plans We have two qualified noncontributory defined benefit pension plans: 1) the Rogers Corporation Employee’s Pension Plan for unionized hourly employees (the Union Plan); and 2) the Rogers Corporation Defined Benefit Pension Plan for (i) all other U.S. employees hired before December 31, 2007 who are salaried employees or non-union hourly employees and (ii) employees of the acquired Arlon business (the Rogers Plan). The Company also maintains the Rogers Corporation Amended and Restated Pension Restoration Plan effective as of January 1, 2004 and the Rogers Corporation Amended and Restated Pension Restoration Plan effective as of January 1, 2005 (collectively, the Nonqualified Plans). The Nonqualified Plans serve to restore certain retirement benefits that might otherwise be lost due to limitations imposed by federal law on qualified pension plans, as well as to provide supplemental retirement benefits, for certain senior executives of the Company. In addition, we sponsor multiple fully insured or self-funded medical plans and life insurance plans for certain retirees. The measurement date for all plans is December 31 for each respective plan year. Pension Plan Proposed Termination The Company currently intends to terminate the Rogers Plan and has requested a determination letter from the Internal Revenue Service (IRS). The termination of the Rogers Plan remains subject to final approval by both management and the IRS. The Company plans to provide for lump sum distributions or annuity payments in connection with the termination of the Rogers Plan and we expect the settlement process to be completed in early 2019. The Company lacks sufficient information as of June 30, 2018 to determine the financial impact of the proposed plan termination. At this time, there are no plans to terminate the Union Plan. Components of Net Periodic (Benefit) Cost The components of net periodic (benefit) cost for the periods indicated were: Pension Benefits Retirement Health and Life Insurance Benefits (Dollars in thousands) Three Months Ended Six Months Ended Three Months Ended Six Months Ended June 30, June 30, June 30, June 30, Change in benefit obligation: 2018 2017 2018 2017 2018 2017 2018 2017 Service cost $ — $ — $ — $ — $ 17 $ 17 $ 38 $ 56 Interest cost 1,692 1,841 3,372 3,682 16 13 31 31 Expected return on plan assets (2,164 ) (2,309 ) (4,333 ) (4,618 ) — — — — Amortization of prior service credit — — — — (400 ) (407 ) (801 ) (780 ) Amortization of net loss (gain) 457 433 913 866 — (17 ) — (31 ) Net periodic (benefit) cost $ (15 ) $ (35 ) $ (48 ) $ (70 ) $ (367 ) $ (394 ) $ (732 ) $ (724 ) Employer Contributions There were no required contributions to our qualified defined benefit pension plans for the three and six months ended June 30, 2018 , and we are not required to make additional contributions to these plans for the remainder of 2018 . We paid $0.1 million of required contributions to our qualified defined benefit pension plans for the three and six months ended June 30, 2017 . No voluntary contributions were made to our qualified defined benefit pension plans for the three and six months ended June 30, 2018 and 2017 . We anticipate making an estimated payment of $25.0 million to the Rogers Plan during the third quarter of 2018 as part of the termination process. As there is no funding requirement for the non-qualified unfunded noncontributory defined benefit pension plan or the retiree health and life insurance benefit plans, benefit payments made during the year are funded directly by the Company.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Segment Information	Segment Information Our reporting structure is comprised of the following operating segments: ACS, EMS and PES. Our non-core businesses are reported in the Other operating segment. We believe this structure aligns our external reporting presentation with how we currently manage and view our business internally. On January 1, 2018, we adopted ASU 2014-09, Revenue from Contracts with Customers . See Note 19, “Revenue from Contracts with Customers” for further information about this adoption. The Company sells products to fabricators and distributors who then sell directly into various end markets. End markets within the ACS operating segment include wireless infrastructure, aerospace and defense, auto safety and connectivity, and consumer electronics. End markets within the EMS operating segment include general industrial, portable electronics, mass transit, and automotive. End markets within the PES operating segment include industrial, e-mobility, renewable energy, mass transit, and micro channel coolers. End markets in the Other operating segment include automotive and industrial. The following table presents a disaggregation of revenue from contracts with customers for the periods indicated; inter-segment sales have been eliminated from the net sales data: (Dollars in thousands) Advanced Connectivity Solutions Elastomeric Material Solutions Power Electronics Solutions Other Total Three Months Ended June 30, 2018 Net sales - recognized over time $ — $ 907 $ 53,052 $ 4,616 $ 58,575 Net sales - recognized at a point in time 76,376 78,309 595 820 156,100 Total net sales $ 76,376 $ 79,216 $ 53,647 $ 5,436 $ 214,675 Operating income $ 10,594 $ 8,421 $ 4,239 $ 1,970 $ 25,224 Three Months Ended June 30, 2017 (1) Net sales - recognized over time $ — $ 415 $ 43,409 $ 4,741 $ 48,565 Net sales - recognized at a point in time 74,340 77,170 496 853 152,859 Total net sales $ 74,340 $ 77,585 $ 43,905 $ 5,594 $ 201,424 Operating income $ 12,997 $ 13,934 $ 3,560 $ 1,823 $ 32,314 Six Months Ended June 30, 2018 Net sales - recognized over time $ — $ 1,941 $ 110,451 $ 9,265 $ 121,657 Net sales - recognized at a point in time 149,831 155,358 909 1,531 307,629 Total net sales $ 149,831 $ 157,299 $ 111,360 $ 10,796 $ 429,286 Operating income $ 18,496 $ 22,581 $ 11,260 $ 3,932 $ 56,269 Six Months Ended June 30, 2017 (1) Net sales - recognized over time $ — $ 1,082 $ 85,681 $ 9,838 $ 96,601 Net sales - recognized at a point in time 152,882 153,352 876 1,541 308,651 Total net sales $ 152,882 $ 154,434 $ 86,557 $ 11,379 $ 405,252 Operating income $ 32,495 $ 26,724 $ 8,404 $ 3,728 $ 71,351 (1) For comparison purposes, this table reflects the disaggregation of 2017 revenue in accordance with Accounting Standards Codification 606, Revenue from Contracts with Customers (ASC 606) . Information relating to our segment operations by geographic area for the three months ended June 30, 2018 and 2017 was as follows: (Dollars in thousands) Net Sales (1) Region/Country Advanced Connectivity Solutions Elastomeric Material Solutions Power Electronics Solutions Other Total June 30, 2018 United States 14,447 35,777 8,279 866 59,369 Other Americas 758 2,179 323 725 3,985 Total Americas 15,205 37,956 8,602 1,591 63,354 China 32,032 24,071 8,940 1,410 66,453 Other APAC 18,588 8,324 7,092 649 34,653 Total APAC 50,620 32,395 16,032 2,059 101,106 Germany 4,823 2,595 16,524 163 24,105 Other EMEA 5,728 6,270 12,489 1,623 26,110 Total EMEA 10,551 8,865 29,013 1,786 50,215 Total Net sales 76,376 79,216 53,647 5,436 214,675 June 30, 2017 United States 11,372 35,904 7,118 1,348 55,742 Other Americas 1,158 2,989 258 193 4,598 Total Americas 12,530 38,893 7,376 1,541 60,340 China 33,949 22,556 7,884 1,072 65,461 Other APAC 16,984 8,693 5,156 1,002 31,835 Total APAC 50,933 31,249 13,040 2,074 97,296 Germany 6,786 2,355 13,380 158 22,679 Other EMEA 4,091 5,088 10,109 1,821 21,109 Total EMEA 10,877 7,443 23,489 1,979 43,788 Total Net sales 74,340 77,585 43,905 5,594 201,424 (1) Net sales are allocated to countries based on the location of the customer. The table above includes countries with 10% or more of net sales for the periods indicated. Information relating to our segment operations by geographic area for the six months ended June 30, 2018 and 2017 was as follows: (Dollars in thousands) Net Sales (1) Region/Country Advanced Connectivity Solutions Elastomeric Material Solutions Power Electronics Solutions Other Total June 30, 2018 United States 26,725 73,469 16,857 2,123 119,174 Other Americas 1,584 3,980 681 555 6,800 Total Americas 28,309 77,449 17,538 2,678 125,974 China 65,539 44,865 18,362 2,727 131,493 Other APAC 33,926 17,484 13,543 1,442 66,395 Total APAC 99,465 62,349 31,905 4,169 197,888 Germany 11,073 5,337 31,234 332 47,976 Other EMEA 10,984 12,164 30,683 3,617 57,448 Total EMEA 22,057 17,501 61,917 3,949 105,424 Total Net sales 149,831 157,299 111,360 10,796 429,286 June 30, 2017 United States 24,595 74,000 15,708 2,563 116,866 Other Americas 1,725 5,461 561 377 8,124 Total Americas 26,320 79,461 16,269 2,940 124,990 China 71,378 39,468 14,251 2,414 127,511 Other APAC 32,911 18,635 10,275 1,917 63,738 Total APAC 104,289 58,103 24,526 4,331 191,249 Germany 12,862 4,648 25,315 341 43,166 Other EMEA 9,411 12,222 20,447 3,767 45,847 Total EMEA 22,273 16,870 45,762 4,108 89,013 Total Net sales 152,882 154,434 86,557 11,379 405,252 (1) Net sales are allocated to countries based on the location of the customer. The table above includes countries with 10% or more of net sales for the periods indicated.

Joint Ventures

Joint Ventures	6 Months Ended
	Jun. 30, 2018
Equity Method Investments and Joint Ventures [Abstract]
Joint Ventures	Joint Ventures As of June 30, 2018 , we had two joint ventures, each 50% owned, which were accounted for under the equity method of accounting. Joint Venture Location Operating Segment Fiscal Year-End Rogers INOAC Corporation (RIC) Japan Elastomeric Material Solutions October 31 Rogers INOAC Suzhou Corporation (RIS) China Elastomeric Material Solutions December 31 We recognized equity income related to the joint ventures of $1.8 million and $2.8 million for the three and six months ended June 30, 2018 , respectively. We recognized equity income related to the joint ventures of $1.0 million and $2.0 million for the three and six months ended June 30, 2017 , respectively. These amounts are included in the condensed consolidated statements of operations. The summarized financial information for the joint ventures for the periods indicated was as follows: Three Months Ended Six Months Ended (Dollars in thousands) June 30, 2018 June 30, 2017 June 30, 2018 June 30, 2017 Net sales $ 14,907 $ 12,846 $ 28,232 $ 24,270 Gross profit $ 5,608 $ 4,706 $ 11,081 $ 9,142 Net income $ 3,609 $ 1,932 $ 5,622 $ 3,952 Receivables from and payables to joint ventures arise during the normal course of business from transactions between us and the joint ventures. As of June 30, 2018 and December 31, 2017 , we had receivables of $3.0 million and $3.7 million , respectively, due from RIC, RIS, our affiliated partner in the joint ventures, as well as its subsidiaries. As of June 30, 2018 and December 31, 2017 , we owed payables of $1.9 million and $2.1 million , respectively, to RIC and RIS.

Debt

Debt	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Debt	Debt On February 17, 2017, we entered into a secured five year credit agreement with JPMorgan Chase Bank, N.A., as administrative agent, and the lenders party thereto (the Third Amended Credit Agreement), which increased the principal amount of our revolving credit facility to up to $450.0 million borrowing capacity, with sublimits for multicurrency borrowings, letters of credit and swing-line notes, and provided an additional $175.0 million accordion feature. Borrowings may be used to finance working capital needs, for letters of credit and for general corporate purposes in the ordinary course of business, including the financing of permitted acquisitions (as defined in the Third Amended Credit Agreement). Borrowings under the Third Amended Credit Agreement can be made as alternate base rate loans or euro-currency loans. Alternate base rate loans bear interest that includes a base reference rate plus a spread of 37.5 to 75.0 basis points, depending on our leverage ratio. The base reference rate is the greater of the prime rate; federal funds effective rate (or the overnight bank funding rate, if greater) plus 50 basis points; or adjusted 1-month LIBOR plus 100 basis points. Euro-currency loans bear interest based on adjusted LIBOR plus a spread of 137.5 to 175.0 basis points, depending on our leverage ratio. In addition to interest payable on the principal amount of indebtedness outstanding from time to time under the Third Amended Credit Agreement, we are required to pay a quarterly fee of 20 to 30 basis points (based upon our leverage ratio) of the unused amount of the lenders’ commitments under the Third Amended Credit Agreement. The Third Amended Credit Agreement contains customary representations, warranties, covenants, mandatory prepayments and events of default under which our payment obligations may be accelerated. If an event of default occurs, the lenders may, among other things, terminate their commitments and declare all outstanding borrowings to be immediately due and payable together with accrued interest and fees. The financial covenants include requirements to maintain (1) a leverage ratio of no more than 3.25 to 1.00, subject to an election to increase the maximum leverage ratio to 3.50 to 1.00 for one fiscal year in connection with a permitted acquisition, and (2) an interest coverage ratio of no less than 3.00 to 1.00. All obligations under the Third Amended Credit Agreement are guaranteed by each of our existing and future material domestic subsidiaries, as defined in the Third Amended Credit Agreement (the Guarantors). The obligations are also secured by a Third Amended and Restated Pledge and Security Agreement, dated as of February 17, 2017, entered into by us and the Guarantors which grants to the administrative agent, for the benefit of the lenders, a security interest, subject to certain exceptions, in substantially all of the non-real estate assets of the Guarantors. These assets include, but are not limited to, receivables, equipment, intellectual property, inventory, and stock in certain subsidiaries. All revolving loans are due on the maturity date, February 17, 2022. We are not required to make any quarterly principal payments under the Third Amended Credit Agreement, and as of June 30, 2018 we have $131.0 million in outstanding borrowings under our credit facility. At June 30, 2018 , we have $2.0 million of outstanding line of credit issuance costs that will be amortized over the life of the Third Amended Credit Agreement, which will terminate in February 2022. We recorded amortization expense of $0.1 million for each of the three-month periods ended June 30, 2018 and 2017 , and $0.3 million and $0.2 million for the six months ended June 30, 2018 and 2017 , respectively, related to these deferred costs. In March 2017, we entered into an interest rate swap to hedge the variable interest rate on $75.0 million of our $450.0 million revolving credit facility. See further discussion in Note 3, “Hedging Transactions and Derivative Financial Instruments.” Restriction on Payment of Dividends Our Third Amended Credit Agreement generally permits us to pay cash dividends to our shareholders, provided that (i) no default or event of default has occurred and is continuing or would result from the dividend payment and (ii) our leverage ratio does not exceed 2.75 to 1.00 . If our leverage ratio exceeds 2.75 to 1.00 , we may nonetheless make up to $20.0 million in restricted payments, including cash dividends, during the fiscal year, provided that no default or event of default has occurred and is continuing or would result from the payments. Our leverage ratio did not exceed 2.75 to 1.00 as of June 30, 2018 . Capital Leases We have a capital lease obligation related to our manufacturing facility in Eschenbach, Germany. Under the terms of the leasing agreement, we have an option to purchase the property upon the expiration of the lease in 2021 at a price which is the greater of (i) the then-current market value or (ii) the residual book value of the land including the buildings and installations thereon. The total obligation recorded for the lease as of June 30, 2018 is $5.3 million . Depreciation expense related to this capital lease was $0.1 million for each of the three-month periods ended June 30, 2018 and 2017 , and was $0.2 million for each of the six-month periods ended June 30, 2018 and 2017 . These expenses are included as depreciation expense in cost of sales on our condensed consolidated statements of operations. Accumulated depreciation at June 30, 2018 and December 31, 2017 was $3.1 million and $3.3 million , respectively. We also incurred interest expense on this capital lease of $0.1 million for each of the three-month periods ended June 30, 2018 and 2017 and $0.1 million for each of the six-month periods ended June 30, 2018 and 2017 . Interest expense related to the debt recorded on the capital lease is included in interest expense on the condensed consolidated statements of operations. In 2017 , we entered into two additional capital lease agreements for office related equipment in various worldwide locations. The total obligation recorded for the capital leases as of June 30, 2018 was $0.7 million . Depreciation expense related to the capital leases was $0.1 million for the three and six months ended June 30, 2018 . These expenses are included as depreciation expense in selling, general and administrative expenses on the condensed consolidated statements of operations. Accumulated depreciation as of June 30, 2018 was $0.2 million .

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended
	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Other Intangible Assets Goodwill The changes in the carrying amount of goodwill for the period ending June 30, 2018 , by operating segment, were as follows: (Dollars in thousands) Advanced Connectivity Solutions Elastomeric Material Solutions Power Electronics Solutions Other Total December 31, 2017 $ 51,693 $ 111,575 $ 71,615 $ 2,224 $ 237,107 Foreign currency translation adjustment — (707 ) (2,113 ) — (2,820 ) June 30, 2018 $ 51,693 $ 110,868 $ 69,502 $ 2,224 $ 234,287 Other Intangible Assets June 30, 2018 December 31, 2017 (Dollars in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer relationships $ 127,885 $ 25,815 $ 102,070 $ 128,907 $ 22,514 $ 106,393 Technology 72,374 35,175 37,199 73,891 33,491 40,400 Trademarks and trade names 10,180 2,649 7,531 10,213 2,157 8,056 Covenants not to compete 760 150 610 1,799 1,108 691 Total definite-lived other intangible assets 211,199 63,789 147,410 214,810 59,270 155,540 Indefinite-lived other intangible asset 4,599 — 4,599 4,738 — 4,738 Total other intangible assets $ 215,798 $ 63,789 $ 152,009 $ 219,548 $ 59,270 $ 160,278 Gross and net carrying amounts and accumulated amortization may differ from prior periods due to foreign exchange rate fluctuations. Amortization expense for the three and six months ended June 30, 2018 was approximately $3.8 million and $7.7 million , respectively. Amortization expense for the three and six months ended June 30, 2017 was approximately $3.8 million and $7.1 million , respectively. The estimated future amortization expense is $7.6 million for the remainder of 2018 and $15.0 million , $11.7 million , $11.0 million and $10.6 million for 2019, 2020, 2021 and 2022, respectively. The indefinite-lived other intangible asset was acquired as part of the acquisition of Curamik Electronics GmbH. This asset is assessed for impairment annually, and between annual assessments if an event occurs or circumstances change that indicate the carrying value may not be recoverable. The definite-lived other intangible assets are amortized using a fair value methodology that is based on the projected economic use of the related underlying asset. The weighted average remaining amortization period as of June 30, 2018 , by definite-lived other intangible asset class, is presented in the table below: Definite-Lived Other Intangible Asset Class Weighted Average Remaining Amortization Period Customer relationships 8.9 Technology 4.8 Trademarks and trade names 5.9 Covenants not to compete 1.7 Total definite-lived other intangible assets 7.7

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Descriptions of the principal environmental and legal proceedings in which we are engaged are set forth below: Voluntary Corrective Action Program Our location in Rogers, Connecticut is part of the Connecticut Voluntary Corrective Action Program (VCAP). As part of this program, we partnered with the Connecticut Department of Energy and Environmental Protection (CT DEEP) to determine the corrective actions to be taken at the site related to contamination issues. We evaluated this matter and completed internal due diligence work related to the site in the fourth quarter of 2015. Remediation activities on the site are ongoing and are recorded as reductions to the accrual as they are incurred. We have incurred aggregate remediation costs of $0.7 million through June 30, 2018 , and the accrual for future remediation efforts is $1.7 million . PCB Contamination We have been working with CT DEEP and the United States Environmental Protection Agency, Region I, in connection with certain polychlorinated biphenyl (PCB) contamination at our facility in Woodstock, Connecticut. The issue was originally discovered in the soil at the facility in the late 1990s, which has been remediated. Further contamination was later found in the groundwater beneath the property, which was addressed with the installation of a pump and treat system in 2011. The future costs related to the maintenance of the groundwater pump and treat system now in place at the site are expected to be minimal. We believe that the remaining remediation activity will continue for several more years and no time frame for completion can be estimated at the present time. PCB contamination at this facility was also found in the buildings and courtyards original to the site, in addition to surrounding areas, including an on-site pond. We have completed remediation activities for the buildings and courtyards. We currently have a reserve of $0.2 million for the pond remediation recorded in our condensed consolidated statements of financial position. We believe this reserve will be adequate to cover the remaining remediation work related to the pond contamination based on the information known at this time. However, if additional contamination is found, the cost of the remaining remediation may increase. Asbestos Litigation We, like many other industrial companies, have been named as a defendant in a number of lawsuits filed in courts across the country by persons alleging personal injury from exposure to products containing asbestos. We have never mined, milled, manufactured or marketed asbestos; rather, we made and provided to industrial users a limited number of products that contained encapsulated asbestos, but we stopped manufacturing these products in the late 1980s. Most of the claims filed against us involve numerous defendants, sometimes as many as several hundred. The following table summarizes the change in number of asbestos claims outstanding during the six months ended June 30, 2018 : Asbestos Claims Claims outstanding at December 31, 2017 687 New claims filed 126 Pending claims concluded (127 ) Claims outstanding at June 30, 2018 686 For the six months ended June 30, 2018 , 110 claims were dismissed and 17 claims were settled. Settlements totaled approximately $4.9 million for the six months ended June 30, 2018 . We recognize a liability for asbestos-related contingencies that are probable of occurrence and reasonably estimable. In connection with the recognition of liabilities for asbestos related matters, we record asbestos-related insurance receivables that are deemed probable. Our estimates of asbestos-related contingent liabilities and related insurance receivables are based on an independent actuarial analysis and an independent insurance usage analysis prepared annually by third parties. The actuarial analysis contains numerous assumptions, including general assumptions regarding the asbestos-related product liability litigation environment and company-specific assumptions regarding claims rates (including diseases alleged), dismissal rates, average settlement costs and average defense costs. The insurance usage analysis considers, among other things, applicable deductibles, retentions and policy limits, the solvency and historical payment experience of various insurance carriers, the likelihood of recovery as estimated by external legal counsel and existing insurance settlements. We review our asbestos-related forecasts annually in the fourth quarter of each year unless facts and circumstances materially change during the year, at which time we would analyze these forecasts. During 2017, we reviewed the projections of our current and future asbestos claims, and determined it was appropriate to extend the liability projection period to cover all current and future claims through 2058. We based our conclusion on our history and experience with the claims data, the diminished volatility and consistency of observable claims data, the period of time that has elapsed since we stopped manufacturing products that contained encapsulated asbestos and an expectation of a downward trend in claims due to the average age of our claimants, which is approaching the average life expectancy. As a result, we believe we are now able to make a reasonable estimate of the actuarially determined liability for current and future asbestos claims through 2058, the expected end of our asbestos liability exposure. As of December 31, 2017 , the balances of the asbestos-related claims and insurance receivables, which are projected to cover all current and future claims through 2058, were $76.2 million and $69.2 million , respectively. To date, the defense and settlement costs of our asbestos-related product liability litigation have been substantially covered by insurance. We have identified continuous coverage for primary, excess and umbrella insurance from the 1950s through the mid-1980s, except for a period in the early 1960s, with respect to which we have entered into an agreement for primary, but not excess or umbrella, coverage. In addition, we have entered into a cost sharing agreement with most of our primary, excess and umbrella insurance carriers to facilitate the ongoing administration and payment of claims by the carriers. The cost sharing agreement may be terminated by any party, but will continue until a party elects to terminate it. As of the filing date for this report, the agreement has not been terminated. During the first quarter of 2018 , we received notice that primary coverage for a period of eight years and excess coverage for a period of two years had been exhausted, and as a result, we incurred indemnity and defense costs of $0.2 million and $0.5 million for the three and six months ended June 30, 2018 , respectively. These costs reduced our existing asbestos-related liabilities to $75.7 million as of June 30, 2018 . We expect to exhaust individual primary, excess and umbrella coverages over time, and there is no assurance that such exhaustion will not accelerate due to additional claims, damages and settlements or that coverage will be available as expected. The amounts recorded for the asbestos-related liabilities and the related insurance receivables described above were based on facts known at the time and a number of assumptions. However, projecting future events, such as the number of new claims to be filed each year, the average cost of disposing of such claims, the length of time it takes to dispose of such claims, coverage issues among insurers and the continuing solvency of various insurance companies, as well as the numerous uncertainties surrounding asbestos litigation in the United States could cause the actual liability and insurance recoveries for us to be higher or lower than those projected or recorded. There can be no assurance that our accrued asbestos liabilities will approximate our actual asbestos-related settlement and defense costs, or that our accrued insurance recoveries will be realized. We believe that it is reasonably possible that we may incur additional charges for our asbestos liabilities and defense costs in the future, which could exceed existing reserves and insurance recovery, but we are unable to estimate the amount of such additional liabilities and costs. We will continue to vigorously defend ourselves and believe we have substantial unutilized insurance coverage to mitigate future costs related to this matter. General Litigation In addition to the above issues, the nature and scope of our business brings us in regular contact with the general public and a variety of businesses and government agencies. Such activities inherently subject us to the possibility of litigation, including environmental and product liability matters that are defended and handled in the ordinary course of business. We have established accruals for matters for which management considers a loss to be probable and reasonably estimable. It is the opinion of management that facts known at the present time do not indicate that such litigation, after taking into account insurance coverage and the aforementioned accruals, will have a material adverse impact on our results of operations, financial position or cash flows.

Share Repurchases

Share Repurchases	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Share Repurchases	Share Repurchases On August 6, 2015 , we initiated a share repurchase program (the Program) of up to $100.0 million of the Company’s capital stock. We initiated the Program to mitigate dilutive effects of stock option exercises and vesting of restricted stock units granted by the Company, in addition to enhancing shareholder value. The Program has no expiration date, and may be suspended or discontinued at any time without notice. As of June 30, 2018 , $49.0 million remained available for repurchase under the Program. We repurchased the following shares of capital stock during the three and six months ended June 30, 2018 : Three Months Ended Six Months Ended (Dollars in thousands) June 30, 2018 June 30, 2018 Shares of capital stock repurchased — 23,138 Value of capital stock repurchased $ — $ 2,999 All repurchases were made using cash from operations.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our effective income tax rate was 32.6% and 33.9% for the three months ended June 30, 2018 and 2017 , respectively. The decrease was primarily due to a lower U.S. effective tax rate, as a result of U.S. tax reform, and changes in pretax mix across jurisdictions with disparate tax rates, partially offset by an increase in current year accruals for uncertain tax positions. Our effective income tax rate was 23.2% and 33.0% for the six months ended June 30, 2018 and 2017 , respectively. The decrease was primarily due to a lower U.S. effective tax rate, as a result of U.S. tax reform, changes in pretax mix across jurisdictions with disparate tax rates, excess tax deductions on equity compensation, R&D credits and a release of reserves for uncertain tax positions, partially offset by an increase in current year accruals for uncertain tax positions. The total amount of unrecognized tax benefits as of June 30, 2018 was $12.4 million , of which $10.9 million would affect our effective tax rate if recognized. It is reasonably possible that approximately $3.6 million of our unrecognized tax benefits as of June 30, 2018 will reverse within the next twelve months. We recognize interest and penalties related to unrecognized tax benefits through income tax expense. As of June 30, 2018 , we had $0.7 million accrued for the payment of interest. We are subject to taxation in the U.S. and various state and foreign jurisdictions. With few exceptions, we are no longer subject to examinations by tax authorities for years prior to 2013.

Restructuring and Impairment Ch

Restructuring and Impairment Charges	6 Months Ended
	Jun. 30, 2018
Restructuring and Related Activities [Abstract]
Restructuring and Impairment Charges	Restructuring and Impairment Charges Global Headquarters Relocation In the second quarter of 2017 , we completed the physical relocation of our global headquarters from Rogers, Connecticut to Chandler, Arizona. We recorded $0.1 million and $1.1 million of expense related to this project in the three months ended June 30, 2018 and 2017 , respectively and $0.5 million and $1.8 million in the six months ended June 30, 2018 and 2017 , respectively. Severance activity related to the headquarters relocation is presented in the table below for the six months ended June 30, 2018 : (Dollars in thousands) Severance Related to Headquarters Relocation Balance at December 31, 2017 $ 183 Provisions 99 Payments (244 ) Balance at June 30, 2018 $ 38 The fair value of the total severance benefits to be paid (including payments already made) in connection with the relocation is $1.1 million , of which we expensed $0.0 million and $0.1 million in the three months ended June 30, 2018 and 2017 , respectively and $0.1 million and $0.3 million in the six months ended June 30, 2018 and 2017 , respectively. The total severance costs are being expensed ratably over the required service period for the affected employees. Facility Consolidation On April 24, 2018, we made the decision to relocate our Santa Fe Springs, California operations to the Company’s facilities in Carol Stream, Illinois and Bear, Delaware. We expect to incur restructuring expenses of approximately $2.0 million in connection with the closure and transfer of production capabilities to the Carol Stream, Illinois and Bear, Delaware facilities. These costs include approximately $0.8 million in severance and retention expenses and $1.2 million of costs related to the relocation of equipment. The Company estimates that approximately $1.5 million and $0.5 million of the costs will be incurred in fiscal years 2018 and 2019, respectively. Completion of the transfer, and start-up of production at the Carol Stream, Illinois and Bear, Delaware facilities, is expected to require capital expenditures of approximately $1.2 million to $1.4 million . We recorded $0.5 million of expense related to this project in the three and six months ended June 30, 2018 , respectively. Severance activity related to the facility consolidation is presented in the table below for the six months ended June 30, 2018 : (Dollars in thousands) Severance Related to Facility Consolidation Balance at December 31, 2017 $ — Provisions 316 Payments (14 ) Balance at June 30, 2018 $ 302 The fair value of the total severance benefits to be paid (including payments already made) in connection with the relocation is $0.8 million . This total is being expensed ratably over the required service period for the affected employees. We incurred $0.3 million of severance related expenses during the three and six months ended June 30, 2018 .

Assets Held for Sale

Assets Held for Sale	6 Months Ended
	Jun. 30, 2018
Assets Held-for-sale, Not Part of Disposal Group [Abstract]
Assets Held for Sale	Assets Held for Sale In the second quarter of 2017, we began actively marketing for sale unutilized property in Chandler, Arizona, consisting of a building and two adjacent parcels of land with an aggregate net book value of $0.9 million . In the second quarter of 2018 , we completed the sale of the building and one parcel of land and recognized a gain on sale of approximately $0.4 million in operating income. The remaining parcel of land being classified as held for sale has a net book value of $0.4 million .

Revenue from Contracts with Cus

Revenue from Contracts with Customers	6 Months Ended
	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer	Revenue from Contracts with Customers Revenue Recognition In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers , to achieve a consistent application of revenue recognition, resulting in a single revenue model to be applied by reporting companies under U.S. generally accepted accounting principles. Under the new model, recognition of revenue occurs when a customer obtains control of promised goods or services in an amount that reflects the consideration to which the providing entity expects to be entitled in exchange for those goods or services. In addition, the new standard requires that reporting companies disclose the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. We recognize revenue when all of the following criteria are met: (1) we have entered into a binding agreement, (2) the performance obligations have been identified, (3) the transaction price to the customer has been determined, (4) the transaction price has been allocated to the performance obligations in the contract, and (5) the performance obligations have been satisfied. The majority of our shipping terms permit us to recognize revenue at point of shipment. Some shipping terms require the goods to be through customs or be received by the customer before title passes. In those instances, revenue is not recognized until either the customer has received the goods or they have passed through customs, depending on the circumstances. Shipping and handling costs are treated as fulfillment costs. Sales tax or VAT are excluded from the measurement of the transaction price. The Company manufactures some products to customer specifications which are customized to such a degree that it is unlikely that another entity would purchase these products or that we could modify these products for another customer. These products are deemed to have no alternative use to the Company whereby we have an enforceable right to payment evidenced by contractual termination clauses. In accordance with ASC 606, for those circumstances we recognize revenue on an over-time basis. Revenue recognition does not occur until the product meets the definition of “no alternative use” and therefore, items that have not yet reached that point in the production process are not included in the population of items with over-time revenue recognition. As appropriate, we record estimated reductions to revenue for customer returns, allowances, and warranty claims. Provisions for such reductions are made at the time of sale and are typically derived from historical trends and other relevant information. Performance Obligations Manufactured goods are our primary performance obligations. Revenue related to our performance obligations is predominantly recognized at a point in time consistent with our shipping terms. For certain products that meet the criteria of no alternative use whereby the Company has the right to payment, we recognize revenue on an over-time basis. The selection of a method to measure progress toward completion of a contract requires judgment and is based on the nature of the products or services to be provided. We use the cost incurred method to measure the progress of our contracts with no alternative use products whereby the Company has the right to payment as we believe it is the best depiction of the transferring of value to the customer. Under the cost incurred method, the extent of progress toward completion is measured based on the ratio of costs incurred to date to the total estimated costs at completion of the contract. Contract costs include labor, materials and subcontractors costs, as well as an allocation of indirect costs. Revenues, including estimated fees or profits, are recorded as costs are incurred. Performance obligations are typically satisfied within three months of receipt of a customer order; therefore, a change in cost estimates will not have a material impact on the percentage of completion noted at the prior quarter end. Our typical payment terms with customers range from 30 days to 105 days. Product pricing is determined and negotiated on a standalone basis. Product pricing is determined without consideration for the pricing, margin, or other information specific to other products that the same customer or other parties related to that customer may also purchase, whether in the same or a different contract. Management allocates the transaction price to its performance obligations primarily based on stand-alone selling prices that may have been developed via specific customer quote for no alternative use products and non-standard products or standard price lists for standard products. The accounting for the estimate of variable consideration is consistent with our current practice. Contract modifications occur when there is a change to the products, price, or both. Contract modifications are treated as a separate contract if there are additions to promised goods and services that are distinct and if the price for that separate performance obligation reflects the stand-alone selling price for those goods or services. However, if the obligations in the contract modification are not distinct and are part of a single performance obligation that is only partially satisfied, the contract is not determined to be a separate contract and is accounted for as a revision to an existing contract. These modifications are accounted for prospectively when remaining promises are distinct from those previously transferred, or through a cumulative catch-up adjustment. Contract Balances The Company has contract assets primarily related to unbilled revenue for revenue recognized related to products that are deemed to have no alternative use whereby we have the right to payment. Revenue is recognized in advance of billing to the customer in these circumstances as billing is typically performed at the time of shipment to the customer. The unbilled revenue is included in the contract assets on the condensed consolidated statements of financial position. The Company did not have any contract liabilities as of June 30, 2018 . The following table presents contract assets by operating segment as of June 30, 2018 : June 30, 2018 (Dollars in thousands) Advanced Connectivity Solutions Elastomeric Material Solutions Power Electronics Solutions Other Total Contract Assets — 384 18,126 3,423 21,933 No impairment losses were recognized during the three and six months ended June 30, 2018 on any receivables or contract assets arising from our contracts with customers. Transition We adopted ASU 2014-09 in the first quarter of 2018 retrospectively with the cumulative effect of applying the standard recognized at the date of implementation and without restatement of comparative periods. This application of the new standard resulted in an increase to the January 1, 2018 balance of retained earnings of approximately $4.2 million , net of tax. The guidance was applied to all contracts that were not completed at the date of implementation. The primary reason for the impact of adoption is due to over-time revenue recognition. If the criteria for over-time recognition are not met, revenue is recognized at a point in time. In considering at what point in time control of the product or service has transferred to the customer, we consider qualitative factors such as: 1) present right to payment; 2) legal title to the asset; 3) physical possession; 4) risks and rewards of ownership; and, 5) customer acceptance. The impact of adoption using the modified retrospective method on the Company’s condensed consolidated financial statements is as follows: As of Condensed Consolidated Statements of Financial Position: December 31, 2017 January 1, 2018 (Dollars in thousands) Under ASC 605 Impact of Adoption Under ASC 606 Contract assets $ — $ 18,099 $ 18,099 Inventories 112,557 (12,307 ) 100,250 Deferred income taxes 10,706 1,580 12,286 Retained earnings 684,540 4,212 688,752 The following tables set forth the amount by which each financial statement line item is affected in the current reporting period by the application of ASC 606, as compared to the guidance that was in effect before its adoption. The impact of adoption on the condensed consolidated financial statements as of and for the three and six months ended June 30, 2018 is as follows: Condensed Consolidated Statements of Operations: Three Months Ended June 30, 2018 June 30, 2018 (In thousands, except per share amounts) Under ASC 605 Impact of Adoption Under ASC 606 Net sales $ 214,782 $ (107 ) $ 214,675 Cost of sales 138,076 (73 ) 138,003 Income tax expense 8,373 — 8,373 Net income 17,363 (34 ) 17,329 Basic earnings per share $ 0.94 $ — $ 0.94 Diluted earnings per share $ 0.93 $ — $ 0.93 Condensed Consolidated Statements of Operations: Six Months Ended June 30, 2018 June 30, 2018 (In thousands, except per share amounts) Under ASC 605 Impact of Adoption Under ASC 606 Net sales $ 425,452 $ 3,834 $ 429,286 Cost of sales 273,400 2,607 276,007 Income tax expense 12,811 333 13,144 Net income 42,571 894 43,465 Basic earnings per share $ 2.32 $ 0.05 $ 2.37 Diluted earnings per share $ 2.28 $ 0.05 $ 2.33 As of Condensed Consolidated Statements of Financial Position: June 30, 2018 June 30, 2018 (Dollars in thousands) Under ASC 605 Impact of Adoption Under ASC 606 Contract assets $ — $ 21,933 $ 21,933 Inventories 132,653 (14,914 ) 117,739 Deferred income taxes 1,588 1,913 3,501 Retained earnings 727,111 5,106 732,217 Condensed Consolidated Statements of Cash Flows: Six Months Ended June 30, 2018 June 30, 2018 (Dollars in thousands) Under ASC 605 Impact of Adoption Under ASC 606 Cash provided by operating activities: Net income $ 42,571 $ 894 $ 43,465 Deferred income taxes 3,546 333 3,879 Contract assets — (21,933 ) (21,933 ) Inventories (21,403 ) 14,914 (6,489 ) Other, net (2,505 ) 5,792 3,287 Net cash provided by operating activities 22,818 — 22,818 Practical Expedients The Company will recognize the incremental costs of obtaining a contract as an expense when incurred as the amortization period of the asset is expected to be one year or less. The Company will not adjust the promised amount of consideration for the effects of a significant financing component as we expect, at contract inception, that the period between when the transfer of goods to our customer occurs and when the customer fully pays for the goods will be one year or less. We do not disclose the Company’s unsatisfied performance obligations as they are part of contracts that have an original expected duration of one year or less.

Supplemental Financial Informat

Supplemental Financial Information	6 Months Ended
	Jun. 30, 2018
Supplemental Income Statement Elements [Abstract]
Supplemental Financial Information	Supplemental Financial Information The components of Other operating (income) expense, net are as follows: Three Months Ended Six Months Ended (Dollars in thousands) June 30, 2018 June 30, 2017 June 30, 2018 June 30, 2017 Gain from antitrust litigation settlement $ — $ — $ (3,591 ) $ — Gain on sale of long-lived assets $ (383 ) $ — $ (383 ) $ (942 ) In the first quarter of 2018 , we recorded a gain from the settlement of antitrust litigation in the amount of $3.6 million as a result of the settlement of a class action lawsuit, filed in 2005, which alleged that Dow Chemical Company and other urethane raw material suppliers unlawfully agreed to fix, raise, maintain or stabilize the prices of Polyether Polyol Products sold in the United States from January 1, 1999 through December 31, 2004 in violation of the federal antitrust laws. In the second quarter of 2018 , we completed the sale of a building and a parcel of land in Arizona that had been classified as held for sale as of June 30, 2017 and recognized a gain on sale of approximately $0.4 million . In the first quarter of 2017, we completed the sale of a parcel of land in Belgium that had been classified as held for sale as of December 31, 2016 and recognized a gain on sale of approximately $0.9 million .

Recent Accounting Standards

Recent Accounting Standards	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Recent Accounting Standards	Recent Accounting Standards In March 2018, the Financial Accounting Standards Board (FASB) issued ASU No. 2018-05, Income Taxes (Topic 740): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118 . This ASU adds guidance that answers questions regarding how certain income tax effects from the Tax Cuts and Jobs Act (the Act) should be applied to companies’ financial statements. The guidance also lists which financial statement disclosures are required under a measurement period approach. In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income . This ASU allows for reclassification of stranded tax effects resulting from the Act from accumulated other comprehensive income to retained earnings. This ASU is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The Company is currently evaluating the method and impact the adoption of ASU 2018-02 will have on the Company’s consolidated financial statements and disclosures. In January 2018, the FASB released guidance on the accounting for tax on the Global Intangible Low Tax Income (GILTI) provisions of the Act. The GILTI provisions impose a tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. The guidance indicates that either accounting for deferred taxes related to GILTI inclusions or to treat any taxes on GILTI inclusions as period costs are both acceptable methods subject to an accounting policy election. Effective in the first quarter of 2018, the Company has elected to treat any potential GILTI inclusions as a period cost. In December 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, we recorded provisional estimates for the deferred tax expense recorded in connection with the remeasurement of certain deferred tax assets and tax expense associated with the mandatory deemed repatriation of foreign earnings at December 31, 2017 . Management has continued to gather and analyze information associated with these provisional estimates and did not record any adjustments during the three and six months ended June 30, 2018 . Any subsequent adjustment to these amounts will be recorded to tax expense in the quarter of 2018 when the analysis is complete. In May 2017, the FASB issued ASU No. 2017-09, Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting. This ASU clarifies which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. ASU No. 2017-09 is effective for interim and annual reporting periods beginning after December 15, 2017. Adoption of this standard will be applied prospectively to awards modified on or after the adoption date. The impact of this new standard will depend on the extent and nature of future changes to the terms and conditions of the Company’s share-based payment awards. The Company adopted this standard on January 1, 2018, which did not have a material effect on the condensed consolidated financial statements. In March 2017, the FASB issued ASU No. 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Post-Retirement Benefit Cost . The changes to the standard require employers to report the service cost component in the same line item as other compensation costs arising from services rendered by employees during the reporting period. The other components of net periodic pension benefit costs will be presented in the statement of operations separately from the service cost and outside of a subtotal of operating income from operations. In addition, only the service cost component may be eligible for capitalization where applicable. ASU 2017-07 became effective for annual periods beginning after December 15, 2017. The Company adopted this standard on January 1, 2018. In conjunction with the adoption of this guidance, the Company reclassified $0.4 million and $0.8 million in net periodic pension benefits from Selling, general and administrative expenses to Other income (expense), net for the three and six months ended June 30, 2017 , respectively. In February 2016, the FASB issued ASU No. 2016-02, Leases , which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e., lessees and lessors). The new standard requires lessees to classify leases as either finance or operating leases and record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. An accounting policy election may be made to account for leases with a term of 12 months or less similar to existing guidance for operating leases today. ASU No. 2016-02 supersedes the existing guidance on accounting for leases. The standard is effective for interim and annual reporting periods for fiscal years beginning after December 15, 2018. Early adoption of this standard is permitted and it is to be adopted using a modified retrospective approach. The Company has established an inventory of existing leases and is in the process of evaluating the classification of each lease and quantifying the accounting impact in accordance with the new standard. The Company expects to adopt this accounting standard beginning in fiscal year 2019.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Acquisition On July 6, 2018, we acquired 100% of the membership interests of Griswold LLC (Griswold), a leading manufacturer of a wide range of high-performance engineered cellular elastomer and microcellular polyurethane products and solutions, for a cash-free, debt-free purchase price of $77.9 million plus an earn-out capped at $3.0 million based on certain of Griswold’s 2018 product sales. We used $82.5 million in borrowings under our existing credit facility to fund the transaction. Griswold, headquartered in Moosup, Connecticut, sells to customers across the automotive, transportation, medical, office products, printing and electronics industries. Due to the timing of the acquisition, disclosures relating to the acquisition, including the allocation of the purchase price, have been omitted because the initial accounting for the transaction was incomplete as of the filing date of this report.

Recent Accounting Standards (Po

Recent Accounting Standards (Policies)	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Recent Accounting Standards	Recent Accounting Standards In March 2018, the Financial Accounting Standards Board (FASB) issued ASU No. 2018-05, Income Taxes (Topic 740): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118 . This ASU adds guidance that answers questions regarding how certain income tax effects from the Tax Cuts and Jobs Act (the Act) should be applied to companies’ financial statements. The guidance also lists which financial statement disclosures are required under a measurement period approach. In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income . This ASU allows for reclassification of stranded tax effects resulting from the Act from accumulated other comprehensive income to retained earnings. This ASU is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The Company is currently evaluating the method and impact the adoption of ASU 2018-02 will have on the Company’s consolidated financial statements and disclosures. In January 2018, the FASB released guidance on the accounting for tax on the Global Intangible Low Tax Income (GILTI) provisions of the Act. The GILTI provisions impose a tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. The guidance indicates that either accounting for deferred taxes related to GILTI inclusions or to treat any taxes on GILTI inclusions as period costs are both acceptable methods subject to an accounting policy election. Effective in the first quarter of 2018, the Company has elected to treat any potential GILTI inclusions as a period cost. In December 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, we recorded provisional estimates for the deferred tax expense recorded in connection with the remeasurement of certain deferred tax assets and tax expense associated with the mandatory deemed repatriation of foreign earnings at December 31, 2017 . Management has continued to gather and analyze information associated with these provisional estimates and did not record any adjustments during the three and six months ended June 30, 2018 . Any subsequent adjustment to these amounts will be recorded to tax expense in the quarter of 2018 when the analysis is complete. In May 2017, the FASB issued ASU No. 2017-09, Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting. This ASU clarifies which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. ASU No. 2017-09 is effective for interim and annual reporting periods beginning after December 15, 2017. Adoption of this standard will be applied prospectively to awards modified on or after the adoption date. The impact of this new standard will depend on the extent and nature of future changes to the terms and conditions of the Company’s share-based payment awards. The Company adopted this standard on January 1, 2018, which did not have a material effect on the condensed consolidated financial statements. In March 2017, the FASB issued ASU No. 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Post-Retirement Benefit Cost . The changes to the standard require employers to report the service cost component in the same line item as other compensation costs arising from services rendered by employees during the reporting period. The other components of net periodic pension benefit costs will be presented in the statement of operations separately from the service cost and outside of a subtotal of operating income from operations. In addition, only the service cost component may be eligible for capitalization where applicable. ASU 2017-07 became effective for annual periods beginning after December 15, 2017. The Company adopted this standard on January 1, 2018. In conjunction with the adoption of this guidance, the Company reclassified $0.4 million and $0.8 million in net periodic pension benefits from Selling, general and administrative expenses to Other income (expense), net for the three and six months ended June 30, 2017 , respectively. In February 2016, the FASB issued ASU No. 2016-02, Leases , which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e., lessees and lessors). The new standard requires lessees to classify leases as either finance or operating leases and record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. An accounting policy election may be made to account for leases with a term of 12 months or less similar to existing guidance for operating leases today. ASU No. 2016-02 supersedes the existing guidance on accounting for leases. The standard is effective for interim and annual reporting periods for fiscal years beginning after December 15, 2018. Early adoption of this standard is permitted and it is to be adopted using a modified retrospective approach. The Company has established an inventory of existing leases and is in the process of evaluating the classification of each lease and quantifying the accounting impact in accordance with the new standard. The Company expects to adopt this accounting standard beginning in fiscal year 2019.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Assets Measured at Fair Value on a Recurring Basis, Categorized by the Level of Inputs Used in the Valuation	Derivative instruments measured at fair value on a recurring basis, categorized by the level of inputs used in the valuation, consist of: Derivative Instruments at Fair Value as of June 30, 2018 (Dollars in thousands) Level 1 Level 2 Level 3 Total Foreign currency contracts $ — $ 118 $ — $ 118 Copper derivative contracts $ — $ 827 $ — $ 827 Interest rate swap $ — $ 1,439 $ — $ 1,439 Derivative Instruments at Fair Value as of December 31, 2017 (Dollars in thousands) Level 1 Level 2 Level 3 Total Foreign currency contracts $ — $ (396 ) $ — $ (396 ) Copper derivative contracts $ — $ 2,016 $ — $ 2,016 Interest rate swap $ — $ 41 $ — $ 41

Hedging Transactions and Deri32

Hedging Transactions and Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Notional Amounts of Outstanding Derivative Positions	As of June 30, 2018 the notional values of these foreign currency forward contracts were: Notional Values of Foreign Currency Derivatives KRW/USD ₩ 3,454,400,000 JPY/EUR ¥ 335,000,000 EUR/USD € 12,822,491 EUR/HUF € 1,132,697 USD/CNY $ 10,637,837 The notional values of our copper contracts outstanding as of June 30, 2018 were: Volume of Copper Derivatives July 2018 - September 2018 153 metric tons per month October 2018 - December 2018 153 metric tons per month January 2019 - March 2019 189 metric tons per month April 2019 - June 2019 188 metric tons per month July 2019 - September 2019 145 metric tons per month
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance	Effects on Statements of Operations and of Comprehensive Income (Loss): (Dollars in thousands) The Effect of Current Derivative Instruments on the Financial Statements for the period ended June 30, 2018 Fair Values of Derivative Instruments as of June 30, 2018 Gain (Loss) Other Assets (Liabilities) Foreign Exchange Contracts Location Three Months Ended Six Months Ended Contracts not designated as hedging instruments Other income (expense), net $ (60 ) $ (124 ) $ 118 Copper Derivatives Contracts not designated as hedging instruments Other income (expense), net $ (363 ) $ (1,185 ) $ 827 Interest Rate Swap Contracts designated as hedging instruments Other comprehensive income (loss) $ 410 $ 1,399 $ 1,439 (Dollars in thousands) The Effect of Current Derivative Instruments on the Financial Statements for the period ended June 30, 2017 Fair Values of Derivative Instruments as of June 30, 2017 Gain (Loss) Other Assets (Liabilities) Foreign Exchange Contracts Location Three Months Ended Six Months Ended Contracts not designated as hedging instruments Other income (expense), net $ (312 ) $ (291 ) $ (312 ) Copper Derivatives Contracts not designated as hedging instruments Other income (expense), net $ 71 $ 205 $ 1,331 Interest Rate Swap Contracts designated as hedging instruments Other comprehensive income (loss) $ (335 ) $ (515 ) $ (622 )

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Jun. 30, 2018
Inventory Disclosure [Abstract]
Inventories	Inventories were as follows at the end of the periods noted below: (Dollars in thousands) June 30, 2018 December 31, 2017 Raw materials $ 51,370 $ 43,092 Work-in-process 29,150 28,133 Finished goods 37,219 41,332 Total inventories $ 117,739 $ 112,557

Accumulated Other Comprehensi34

Accumulated Other Comprehensive Loss (Tables)	6 Months Ended
	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Balances Related to Each Component of Accumulated Other Comprehensive Income (Loss)	The changes in accumulated other comprehensive loss by component for the six months ended June 30, 2018 and 2017 were as follows: (Dollars and accompanying footnotes in thousands) Foreign currency translation adjustments Funded status of pension plans and other postretirement benefits (1) Unrealized gain (loss) on derivative instruments (2) Total Beginning Balance December 31, 2017 $ (17,983 ) $ (47,198 ) $ 26 $ (65,155 ) Other comprehensive income (loss) before reclassifications (8,293 ) — 1,097 (7,196 ) Amounts reclassified from accumulated other comprehensive loss — 87 — 87 Net current-period other comprehensive income (loss) (8,293 ) 87 1,097 (7,109 ) Ending Balance June 30, 2018 $ (26,276 ) $ (47,111 ) $ 1,123 $ (72,264 ) Beginning Balance December 31, 2016 $ (46,446 ) $ (45,816 ) $ — $ (92,262 ) Other comprehensive income (loss) before reclassifications 16,730 — (435 ) 16,295 Actuarial net gain incurred in the fiscal year — 334 — 334 Amounts reclassified from accumulated other comprehensive loss — 36 107 143 Net current-period other comprehensive income (loss) 16,730 370 (328 ) 16,772 Ending Balance June 30, 2017 $ (29,716 ) $ (45,446 ) $ (328 ) $ (75,490 ) (1) Net of taxes of $9,536 and $9,563 as of June 30, 2018 and December 31, 2017 , respectively. Net of taxes of $8,961 and $9,160 as of June 30, 2017 and December 31, 2016 , respectively. (2) Net of taxes of $316 and $15 as of June 30, 2018 and December 31, 2017 , respectively. Net of taxes of $187 and $0 as of June 30, 2017 and December 31, 2016 , respectively.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings Per Share	The following table sets forth the computation of basic and diluted earnings per share for the periods indicated: (Dollars and shares in thousands, except per share amounts) Three Months Ended Six Months Ended June 30, 2018 June 30, 2017 June 30, 2018 June 30, 2017 Numerator: Net income $ 17,329 $ 20,896 $ 43,465 $ 47,928 Denominator: Weighted-average shares outstanding - basic 18,389 18,140 18,338 18,098 Effect of dilutive shares 271 407 297 362 Weighted-average shares outstanding - diluted 18,660 18,547 18,635 18,460 Basic earnings per share $ 0.94 $ 1.15 $ 2.37 $ 2.65 Diluted earnings per share $ 0.93 $ 1.13 $ 2.33 $ 2.60

Equity Compensation (Tables)

Equity Compensation (Tables)	6 Months Ended
	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Assumptions Used in Calculation of Fair Value	Below were the assumptions used in the Monte Carlo calculation: June 30, 2018 June 30, 2017 Expected volatility 34.8% 33.6% Expected term (in years) 3.0 3.0 Risk-free interest rate 2.28% 1.38%
Summary of Activity Under Stock Option Plans	The following table summarizes the change in number of stock options outstanding for the six months ended June 30, 2018 : Options Outstanding Weighted- Average Exercise Price Per Share Weighted-Average Remaining Contractual Life in Years Aggregate Intrinsic Value Outstanding at December 31, 2017 33,283 $ 36.40 2.2 $ 4,177,655 Options exercised (17,683 ) $ 39.48 Options forfeited — $ — Options outstanding at June 30, 2018 15,600 $ 32.91 2.5 $ 1,225,308 Options exercisable at June 30, 2018 15,600 $ 32.91 2.5 $ 1,225,308 Options vested at June 30, 2018 15,600 $ 32.91 2.5 $ 1,225,308
Time Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Activities	The following table summarizes the change in number of time-based restricted stock units outstanding for the six months ended June 30, 2018 : Time-Based Restricted Stock Units Awards outstanding at December 31, 2017 173,331 Awards granted 41,310 Stock issued (77,513 ) Awards forfeited (14,627 ) Awards outstanding at June 30, 2018 122,501
Performance-Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Activities	The following table summarizes the change in number of performance-based restricted stock units outstanding for the six months ended June 30, 2018 : Performance-Based Restricted Stock Units Awards outstanding at December 31, 2017 169,202 Awards granted 72,160 Stock issued (81,230 ) Awards forfeited (17,489 ) Awards outstanding at June 30, 2018 142,643
Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Activities	The following table summarizes the change in number of deferred stock units outstanding during the six months ended June 30, 2018 : Deferred Stock Units Awards outstanding at December 31, 2017 9,250 Awards granted 8,400 Stock issued (8,400 ) Awards outstanding at June 30, 2018 9,250

Pension Benefits and Other Po37

Pension Benefits and Other Postretirement Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2018
Defined Benefit Plan [Abstract]
Components of net periodic benefit cost	The components of net periodic (benefit) cost for the periods indicated were: Pension Benefits Retirement Health and Life Insurance Benefits (Dollars in thousands) Three Months Ended Six Months Ended Three Months Ended Six Months Ended June 30, June 30, June 30, June 30, Change in benefit obligation: 2018 2017 2018 2017 2018 2017 2018 2017 Service cost $ — $ — $ — $ — $ 17 $ 17 $ 38 $ 56 Interest cost 1,692 1,841 3,372 3,682 16 13 31 31 Expected return on plan assets (2,164 ) (2,309 ) (4,333 ) (4,618 ) — — — — Amortization of prior service credit — — — — (400 ) (407 ) (801 ) (780 ) Amortization of net loss (gain) 457 433 913 866 — (17 ) — (31 ) Net periodic (benefit) cost $ (15 ) $ (35 ) $ (48 ) $ (70 ) $ (367 ) $ (394 ) $ (732 ) $ (724 )

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Reportable Segment Information	The following table presents a disaggregation of revenue from contracts with customers for the periods indicated; inter-segment sales have been eliminated from the net sales data: (Dollars in thousands) Advanced Connectivity Solutions Elastomeric Material Solutions Power Electronics Solutions Other Total Three Months Ended June 30, 2018 Net sales - recognized over time $ — $ 907 $ 53,052 $ 4,616 $ 58,575 Net sales - recognized at a point in time 76,376 78,309 595 820 156,100 Total net sales $ 76,376 $ 79,216 $ 53,647 $ 5,436 $ 214,675 Operating income $ 10,594 $ 8,421 $ 4,239 $ 1,970 $ 25,224 Three Months Ended June 30, 2017 (1) Net sales - recognized over time $ — $ 415 $ 43,409 $ 4,741 $ 48,565 Net sales - recognized at a point in time 74,340 77,170 496 853 152,859 Total net sales $ 74,340 $ 77,585 $ 43,905 $ 5,594 $ 201,424 Operating income $ 12,997 $ 13,934 $ 3,560 $ 1,823 $ 32,314 Six Months Ended June 30, 2018 Net sales - recognized over time $ — $ 1,941 $ 110,451 $ 9,265 $ 121,657 Net sales - recognized at a point in time 149,831 155,358 909 1,531 307,629 Total net sales $ 149,831 $ 157,299 $ 111,360 $ 10,796 $ 429,286 Operating income $ 18,496 $ 22,581 $ 11,260 $ 3,932 $ 56,269 Six Months Ended June 30, 2017 (1) Net sales - recognized over time $ — $ 1,082 $ 85,681 $ 9,838 $ 96,601 Net sales - recognized at a point in time 152,882 153,352 876 1,541 308,651 Total net sales $ 152,882 $ 154,434 $ 86,557 $ 11,379 $ 405,252 Operating income $ 32,495 $ 26,724 $ 8,404 $ 3,728 $ 71,351 (1) For comparison purposes, this table reflects the disaggregation of 2017 revenue in accordance with Accounting Standards Codification 606, Revenue from Contracts with Customers (ASC 606) . Information relating to our segment operations by geographic area for the three months ended June 30, 2018 and 2017 was as follows: (Dollars in thousands) Net Sales (1) Region/Country Advanced Connectivity Solutions Elastomeric Material Solutions Power Electronics Solutions Other Total June 30, 2018 United States 14,447 35,777 8,279 866 59,369 Other Americas 758 2,179 323 725 3,985 Total Americas 15,205 37,956 8,602 1,591 63,354 China 32,032 24,071 8,940 1,410 66,453 Other APAC 18,588 8,324 7,092 649 34,653 Total APAC 50,620 32,395 16,032 2,059 101,106 Germany 4,823 2,595 16,524 163 24,105 Other EMEA 5,728 6,270 12,489 1,623 26,110 Total EMEA 10,551 8,865 29,013 1,786 50,215 Total Net sales 76,376 79,216 53,647 5,436 214,675 June 30, 2017 United States 11,372 35,904 7,118 1,348 55,742 Other Americas 1,158 2,989 258 193 4,598 Total Americas 12,530 38,893 7,376 1,541 60,340 China 33,949 22,556 7,884 1,072 65,461 Other APAC 16,984 8,693 5,156 1,002 31,835 Total APAC 50,933 31,249 13,040 2,074 97,296 Germany 6,786 2,355 13,380 158 22,679 Other EMEA 4,091 5,088 10,109 1,821 21,109 Total EMEA 10,877 7,443 23,489 1,979 43,788 Total Net sales 74,340 77,585 43,905 5,594 201,424 (1) Net sales are allocated to countries based on the location of the customer. The table above includes countries with 10% or more of net sales for the periods indicated. Information relating to our segment operations by geographic area for the six months ended June 30, 2018 and 2017 was as follows: (Dollars in thousands) Net Sales (1) Region/Country Advanced Connectivity Solutions Elastomeric Material Solutions Power Electronics Solutions Other Total June 30, 2018 United States 26,725 73,469 16,857 2,123 119,174 Other Americas 1,584 3,980 681 555 6,800 Total Americas 28,309 77,449 17,538 2,678 125,974 China 65,539 44,865 18,362 2,727 131,493 Other APAC 33,926 17,484 13,543 1,442 66,395 Total APAC 99,465 62,349 31,905 4,169 197,888 Germany 11,073 5,337 31,234 332 47,976 Other EMEA 10,984 12,164 30,683 3,617 57,448 Total EMEA 22,057 17,501 61,917 3,949 105,424 Total Net sales 149,831 157,299 111,360 10,796 429,286 June 30, 2017 United States 24,595 74,000 15,708 2,563 116,866 Other Americas 1,725 5,461 561 377 8,124 Total Americas 26,320 79,461 16,269 2,940 124,990 China 71,378 39,468 14,251 2,414 127,511 Other APAC 32,911 18,635 10,275 1,917 63,738 Total APAC 104,289 58,103 24,526 4,331 191,249 Germany 12,862 4,648 25,315 341 43,166 Other EMEA 9,411 12,222 20,447 3,767 45,847 Total EMEA 22,273 16,870 45,762 4,108 89,013 Total Net sales 152,882 154,434 86,557 11,379 405,252 (1) Net sales are allocated to countries based on the location of the customer. The table above includes countries with 10% or more of net sales for the periods indicated.

Joint Ventures (Tables)

Joint Ventures (Tables)	6 Months Ended
	Jun. 30, 2018
Equity Method Investments and Joint Ventures [Abstract]
Joint Ventures Accounted for Under Equity Method of Accounting	As of June 30, 2018 , we had two joint ventures, each 50% owned, which were accounted for under the equity method of accounting. Joint Venture Location Operating Segment Fiscal Year-End Rogers INOAC Corporation (RIC) Japan Elastomeric Material Solutions October 31 Rogers INOAC Suzhou Corporation (RIS) China Elastomeric Material Solutions December 31
Summarized Information for Joint Ventures	The summarized financial information for the joint ventures for the periods indicated was as follows: Three Months Ended Six Months Ended (Dollars in thousands) June 30, 2018 June 30, 2017 June 30, 2018 June 30, 2017 Net sales $ 14,907 $ 12,846 $ 28,232 $ 24,270 Gross profit $ 5,608 $ 4,706 $ 11,081 $ 9,142 Net income $ 3,609 $ 1,932 $ 5,622 $ 3,952

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The changes in the carrying amount of goodwill for the period ending June 30, 2018 , by operating segment, were as follows: (Dollars in thousands) Advanced Connectivity Solutions Elastomeric Material Solutions Power Electronics Solutions Other Total December 31, 2017 $ 51,693 $ 111,575 $ 71,615 $ 2,224 $ 237,107 Foreign currency translation adjustment — (707 ) (2,113 ) — (2,820 ) June 30, 2018 $ 51,693 $ 110,868 $ 69,502 $ 2,224 $ 234,287
Intangible Assets	Other Intangible Assets June 30, 2018 December 31, 2017 (Dollars in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer relationships $ 127,885 $ 25,815 $ 102,070 $ 128,907 $ 22,514 $ 106,393 Technology 72,374 35,175 37,199 73,891 33,491 40,400 Trademarks and trade names 10,180 2,649 7,531 10,213 2,157 8,056 Covenants not to compete 760 150 610 1,799 1,108 691 Total definite-lived other intangible assets 211,199 63,789 147,410 214,810 59,270 155,540 Indefinite-lived other intangible asset 4,599 — 4,599 4,738 — 4,738 Total other intangible assets $ 215,798 $ 63,789 $ 152,009 $ 219,548 $ 59,270 $ 160,278
Weighted Average Amortization Period, by Intangible Asset Class	The weighted average remaining amortization period as of June 30, 2018 , by definite-lived other intangible asset class, is presented in the table below: Definite-Lived Other Intangible Asset Class Weighted Average Remaining Amortization Period Customer relationships 8.9 Technology 4.8 Trademarks and trade names 5.9 Covenants not to compete 1.7 Total definite-lived other intangible assets 7.7

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense	The following table summarizes the change in number of asbestos claims outstanding during the six months ended June 30, 2018 : Asbestos Claims Claims outstanding at December 31, 2017 687 New claims filed 126 Pending claims concluded (127 ) Claims outstanding at June 30, 2018 686

Share Repurchases (Tables)

Share Repurchases (Tables)	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Schedule of Stock Repurchased	We repurchased the following shares of capital stock during the three and six months ended June 30, 2018 : Three Months Ended Six Months Ended (Dollars in thousands) June 30, 2018 June 30, 2018 Shares of capital stock repurchased — 23,138 Value of capital stock repurchased $ — $ 2,999

Restructuring and Impairment 43

Restructuring and Impairment Charges (Tables)	6 Months Ended
	Jun. 30, 2018
Restructuring and Related Activities [Abstract]
Restructuring and Related Costs	Severance activity related to the facility consolidation is presented in the table below for the six months ended June 30, 2018 : (Dollars in thousands) Severance Related to Facility Consolidation Balance at December 31, 2017 $ — Provisions 316 Payments (14 ) Balance at June 30, 2018 $ 302 Severance activity related to the headquarters relocation is presented in the table below for the six months ended June 30, 2018 : (Dollars in thousands) Severance Related to Headquarters Relocation Balance at December 31, 2017 $ 183 Provisions 99 Payments (244 ) Balance at June 30, 2018 $ 38

Revenue from Contracts with C44

Revenue from Contracts with Customers (Tables)	6 Months Ended
	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Contract with Customer, Asset and Liability	The following table presents contract assets by operating segment as of June 30, 2018 : June 30, 2018 (Dollars in thousands) Advanced Connectivity Solutions Elastomeric Material Solutions Power Electronics Solutions Other Total Contract Assets — 384 18,126 3,423 21,933
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The impact of adoption using the modified retrospective method on the Company’s condensed consolidated financial statements is as follows: As of Condensed Consolidated Statements of Financial Position: December 31, 2017 January 1, 2018 (Dollars in thousands) Under ASC 605 Impact of Adoption Under ASC 606 Contract assets $ — $ 18,099 $ 18,099 Inventories 112,557 (12,307 ) 100,250 Deferred income taxes 10,706 1,580 12,286 Retained earnings 684,540 4,212 688,752 The following tables set forth the amount by which each financial statement line item is affected in the current reporting period by the application of ASC 606, as compared to the guidance that was in effect before its adoption. The impact of adoption on the condensed consolidated financial statements as of and for the three and six months ended June 30, 2018 is as follows: Condensed Consolidated Statements of Operations: Three Months Ended June 30, 2018 June 30, 2018 (In thousands, except per share amounts) Under ASC 605 Impact of Adoption Under ASC 606 Net sales $ 214,782 $ (107 ) $ 214,675 Cost of sales 138,076 (73 ) 138,003 Income tax expense 8,373 — 8,373 Net income 17,363 (34 ) 17,329 Basic earnings per share $ 0.94 $ — $ 0.94 Diluted earnings per share $ 0.93 $ — $ 0.93 Condensed Consolidated Statements of Operations: Six Months Ended June 30, 2018 June 30, 2018 (In thousands, except per share amounts) Under ASC 605 Impact of Adoption Under ASC 606 Net sales $ 425,452 $ 3,834 $ 429,286 Cost of sales 273,400 2,607 276,007 Income tax expense 12,811 333 13,144 Net income 42,571 894 43,465 Basic earnings per share $ 2.32 $ 0.05 $ 2.37 Diluted earnings per share $ 2.28 $ 0.05 $ 2.33 As of Condensed Consolidated Statements of Financial Position: June 30, 2018 June 30, 2018 (Dollars in thousands) Under ASC 605 Impact of Adoption Under ASC 606 Contract assets $ — $ 21,933 $ 21,933 Inventories 132,653 (14,914 ) 117,739 Deferred income taxes 1,588 1,913 3,501 Retained earnings 727,111 5,106 732,217 Condensed Consolidated Statements of Cash Flows: Six Months Ended June 30, 2018 June 30, 2018 (Dollars in thousands) Under ASC 605 Impact of Adoption Under ASC 606 Cash provided by operating activities: Net income $ 42,571 $ 894 $ 43,465 Deferred income taxes 3,546 333 3,879 Contract assets — (21,933 ) (21,933 ) Inventories (21,403 ) 14,914 (6,489 ) Other, net (2,505 ) 5,792 3,287 Net cash provided by operating activities 22,818 — 22,818

Supplemental Financial Inform45

Supplemental Financial Information (Tables)	6 Months Ended
	Jun. 30, 2018
Supplemental Income Statement Elements [Abstract]
Schedule Of Income Statement Supplemental Disclosures	The components of Other operating (income) expense, net are as follows: Three Months Ended Six Months Ended (Dollars in thousands) June 30, 2018 June 30, 2017 June 30, 2018 June 30, 2017 Gain from antitrust litigation settlement $ — $ — $ (3,591 ) $ — Gain on sale of long-lived assets $ (383 ) $ — $ (383 ) $ (942 )

Basis of Presentation - Narrati

Basis of Presentation - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Gain (loss) on disposition of assets	$ 383	$ 0	$ (942)
Selling, general and administrative expenses	42,540	40,012		$ 83,137	$ 74,580
Other operating (income) expense, net		0		3,974	942
Other income (expense), net	$ (34)	260		$ 32	1,379
Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Selling, general and administrative expenses		$ (400)			(800)
Other income (expense), net					$ 400

Fair Value Measurements (Variou

Fair Value Measurements (Various Instruments That Require Fair Value Measurement) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Foreign currency contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	$ 118	$ (396)
Foreign currency contracts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	0	0
Foreign currency contracts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	118	(396)
Foreign currency contracts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	0	0
Copper derivative contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	827	2,016
Copper derivative contracts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	0	0
Copper derivative contracts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	827	2,016
Copper derivative contracts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	0	0
Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	1,439	41
Interest rate swap | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	0	0
Interest rate swap | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives		41
Interest rate swap | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	$ 0	$ 0

Hedging Transactions and Deri48

Hedging Transactions and Derivative Financial Instruments (Additional Information) (Details) $ in Millions	Jun. 30, 2018Contract	Jun. 30, 2017USD ($)	Feb. 17, 2017USD ($)
Bank Term Loan
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of derivative contracts related to minimizing risk associated with potential rise in copper prices (contract) | Contract	25
Third Amended Credit Agreement | Revolving Credit Facility
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Maximum borrowing capacity			$ 450
Interest rate swap | Third Amended Credit Agreement | Revolving Credit Facility
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged balance on debt instrument		$ 75

Hedging Transactions and Deri49

Hedging Transactions and Derivative Financial Instruments (Notional Values of Derivative Instruments) (Details)	Jun. 30, 2018JPY (¥)T	Jun. 30, 2018EUR (€)T	Jun. 30, 2018USD ($)T	Jun. 30, 2018KRW (₩)T
Contracts not designated as hedging instruments | KRW/USD | Foreign Exchange Forward
Derivative [Line Items]
Notional amount | ₩				₩ 3,454,400,000
Contracts not designated as hedging instruments | JPY/EUR | Foreign Exchange Forward
Derivative [Line Items]
Notional amount | ¥	¥ 335,000,000
Contracts not designated as hedging instruments | EUR/USD | Foreign Exchange Forward
Derivative [Line Items]
Notional amount | €		€ 12,822,491
Contracts not designated as hedging instruments | EUR/HUF | Foreign Exchange Forward
Derivative [Line Items]
Notional amount | €		€ 1,132,697
Contracts not designated as hedging instruments | USD/CNY | Foreign Exchange Forward
Derivative [Line Items]
Notional amount | $			$ 10,637,837
Contracts designated as hedging instruments | October 2018 - December 2018
Derivative [Line Items]
Volume of Copper Derivatives	153	153	153	153
Contracts designated as hedging instruments | January 2019 - March 2019
Derivative [Line Items]
Volume of Copper Derivatives	153	153	153	153
Contracts designated as hedging instruments | April 2019 - June 2019
Derivative [Line Items]
Volume of Copper Derivatives	16,289	16,289	16,289	16,289
Contracts designated as hedging instruments | July 2019 - September 2019
Derivative [Line Items]
Volume of Copper Derivatives	188	188	188	188
Contracts designated as hedging instruments | July 2019 - September 2019
Derivative [Line Items]
Volume of Copper Derivatives	145	145	145	145

Hedging Transactions and Deri50

Hedging Transactions and Derivative Financial Instruments (Effect and Fair Value of Derivative Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2017
Contracts not designated as hedging instruments | Other income (expense), net | Foreign Exchange Contracts
Derivative [Line Items]
Effect of current derivative instruments	$ (60)	$ (312)	$ (291)
Fair Values of Derivative Instruments	118	(312)	(312)
Contracts not designated as hedging instruments | Other income (expense), net | Copper Derivatives
Derivative [Line Items]
Effect of current derivative instruments	(363)	71	205
Fair Values of Derivative Instruments	827	1,331	1,331
Contracts designated as hedging instruments | Other comprehensive income (loss) | Interest rate swap
Derivative [Line Items]
Effect of current derivative instruments	410	(335)	(515)
Fair Values of Derivative Instruments	$ 1,439	$ (622)	$ (622)

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 51,370	$ 43,092
Work-in-process	29,150	28,133
Finished goods	37,219	41,332
Total inventories	$ 117,739	$ 112,557

Acquisitions - Additional Infor

Acquisitions - Additional Information (Details) - Diversified Silicone Products, Inc. $ in Millions	Jan. 06, 2017USD ($)
Business Acquisition [Line Items]
Consideration transferred	$ 60.2
Revolving Credit Facility
Business Acquisition [Line Items]
Proceeds from line of credit	$ 30

Accumulated Other Comprehensi53

Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, Beginning of Period				$ 766,573
Other comprehensive income (loss) before reclassifications				(7,196)	$ 16,295
Actuarial net gain incurred in the fiscal year					334
Amounts reclassified from accumulated other comprehensive (income) loss				87	143
Other comprehensive income (loss)		$ (14,930)	$ 12,717	(7,109)	16,772
Balance, End of Period		804,785		804,785
AOCI, Pension and other postretirement benefit plans, tax		9,536	8,961	9,536	8,961	$ 9,563	$ 9,160
AOCI, Cumulative changes in net gain (loss) from cash flow hedges, tax		316	(187)	316	(187)	$ (15)	$ 0
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, Beginning of Period				(17,983)	(46,446)
Other comprehensive income (loss) before reclassifications				(8,293)	16,730
Actuarial net gain incurred in the fiscal year					0
Amounts reclassified from accumulated other comprehensive (income) loss				0	0
Other comprehensive income (loss)				(8,293)	16,730
Balance, End of Period		(26,276)	(29,716)	(26,276)	(29,716)
Funded status of pension plans and other postretirement benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, Beginning of Period				(47,198)	(45,816)
Other comprehensive income (loss) before reclassifications				0	0
Actuarial net gain incurred in the fiscal year					334
Amounts reclassified from accumulated other comprehensive (income) loss				87	36
Other comprehensive income (loss)	[1]			87	370
Balance, End of Period	[1]	(47,111)	(45,446)	(47,111)	(45,446)
Unrealized gain (loss) on derivative instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, Beginning of Period				26	0
Other comprehensive income (loss) before reclassifications				1,097	(435)
Actuarial net gain incurred in the fiscal year					0
Amounts reclassified from accumulated other comprehensive (income) loss				0	107
Other comprehensive income (loss)	[2]			1,097	(328)
Balance, End of Period	[2]	1,123	(328)	1,123	(328)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, Beginning of Period				(65,155)	(92,262)
Other comprehensive income (loss)				(7,109)
Balance, End of Period		$ (72,264)	$ (75,490)	$ (72,264)	$ (75,490)
[1]	Net of taxes of $9,536 and $9,563 as of June 30, 2018 and December 31, 2017, respectively. Net of taxes of $8,961 and $9,160 as of June 30, 2017 and December 31, 2016, respectively.
[2]	Net of taxes of $316 and $15 as of June 30, 2018 and December 31, 2017, respectively. Net of taxes of $187 and $0 as of June 30, 2017 and December 31, 2016, respectively.

Earnings Per Share (Computation

Earnings Per Share (Computation of Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net income	$ 17,329	$ 20,896	$ 43,465	$ 47,928
Denominator:
Weighted-average shares outstanding - basic (shares)	18,389,000	18,140,000	18,338,000	18,098,000
Effect of dilutive shares (shares)	271,000	407,000	297,000	362,000
Weighted-average shares outstanding - diluted (shares)	18,660,000	18,547,000	18,635,000	18,460,000
Basic earnings per share (in dollars per share)	$ 0.94	$ 1.15	$ 2.37	$ 2.65
Diluted earnings per share (in dollars per share)	$ 0.93	$ 1.13	$ 2.33	$ 2.60
Anti-dilutive shares excluded (shares)	27,145	0

Equity Compensation (Additional

Equity Compensation (Additional Information) (Details)	3 Months Ended		6 Months Ended		12 Months Ended	63 Months Ended
	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)offering_periodsshares	Jun. 30, 2017USD ($)	Dec. 31, 2017	Jun. 30, 2017shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from the exercise of stock options, net			$ 698,000	$ 1,905,000
Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense (income)	$ 900,000	$ 900,000	$ 900,000	900,000
Stock vested (shares) | shares			8,400
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, contractual term (years)			10 years
Stock options, grants in period, gross | shares						0
Options exercised, total intrinsic value			$ 700,000
Proceeds from the exercise of stock options, net			$ 2,000,000
Performance-Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock award program, measurement period (years)			3 years
Expected dividend yield (percent)			0.00%
Compensation expense (income)	800,000	1,600,000	$ 1,800,000	1,500,000
Stock vested (shares) | shares			81,230
Performance-Based Restricted Stock | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock award program, awarded shares as a percentage of the original award amount (percent)			0.00%
Performance-Based Restricted Stock | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock award program, awarded shares as a percentage of the original award amount (percent)			200.00%
Time Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense (income)	1,300,000	1,700,000	$ 2,900,000	2,700,000
Stock vested (shares) | shares			77,513
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense (income)	$ 200,000	$ 100,000	$ 100,000	$ 0
Employee stock purchase plan, number of offering (offering period) | offering_periods			2
Employee stock purchase plan, offering period (months)			6 months
Employee stock purchase plan, purchase price discount (percent)					15.00%

Equity Compensation (Monte Carl

Equity Compensation (Monte Carlo Calculation Assumptions) (Details) - Performance-Based Restricted Stock	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility (percent)	34.80%	33.60%
Expected term (years)	3 years	3 years
Risk-free interest rate (percent)	2.28%	1.38%

Equity Compensation (Performanc

Equity Compensation (Performance Based Restricted Stock Awards) (Details) - Performance-Based Restricted Stock	6 Months Ended
	Jun. 30, 2018shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Non-vested awards outstanding beginning balance (shares)	169,202
Awards granted (shares)	72,160
Stock issued (shares)	(81,230)
Awards forfeited (shares)	(17,489)
Non-vested awards outstanding ending balance (shares)	142,643

Equity Compensation (Time Based

Equity Compensation (Time Based Restricted Stock Awards) (Details) - Time Based Restricted Stock	6 Months Ended
	Jun. 30, 2018shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Non-vested awards outstanding beginning balance (shares)	173,331
Awards granted (shares)	41,310
Stock issued (shares)	(77,513)
Awards forfeited (shares)	(14,627)
Non-vested awards outstanding ending balance (shares)	122,501

Equity Compensation (Deferred S

Equity Compensation (Deferred Stock Units) (Details) - Deferred Stock Units	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)shares	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)shares	Jun. 30, 2017USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion ratio			1
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Non-vested awards outstanding beginning balance (shares)			9,250
Awards granted (shares)			8,400
Stock issued (shares)			(8,400)
Non-vested awards outstanding ending balance (shares)	9,250		9,250
Compensation expense (income) | $	$ 900,000	$ 900,000	$ 900,000	$ 900,000

Equity Compensation (Summary of

Equity Compensation (Summary of Activity Under Stock Option Plans) (Details) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Options Outstanding
Options outstanding at beginning of period (shares)		33,283
Options exercised (shares)	(17,683)
Options forfeited (shares)	0
Options outstanding at end of period (shares)	15,600	15,600	33,283
Options exercisable at end of period (shares)	15,600	15,600
Options vested at end of period (shares)	15,600	15,600
Weighted- Average Exercise Price Per Share
Options outstanding at beginning of period (in USD per share)		$ 36.40
Options exercised (in USD per share)	$ 39.48
Options forfeited (dollars per share)	0
Options outstanding at end of period (in USD per share)	32.91	32.91	$ 36.40
Options exercisable at end of peirod (in USD per share)	32.91	32.91
Options vested at end of period (in USD per share)	$ 32.91	$ 32.91
Weighted-Average Remaining Contractual Life in Years
Weighted-Average Remaining Contractual Life in Year, Options outstanding		2 years 6 months	2 years 2 months
Options exercisable, Weighted-Average Remaining Contractual Life in Years (years)		2 years 6 months
Options vested, Weighted-Average Remaining Contractual Life in Years (years)		2 years 6 months
Aggregate Intrinsic Value
Options outstanding, Aggregate Intrinsic Value	$ 1,225,308	$ 1,225,308	$ 4,177,655
Options exercisable, Aggregate Intrinsic Value	1,225,308	1,225,308
Options vested, Aggregate Intrinsic Value	$ 1,225,308	$ 1,225,308

Pension Benefits and Other Po61

Pension Benefits and Other Postretirement Benefit Plans (Additional Information) (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)plan	Jun. 30, 2017USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Number of qualified noncontributory defined benefit plans | plan		2
Anticipated payment for defined benefit pensions		$ 338	$ 147
Bear Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Required employer contribution	$ 100

Pension Benefits and Other Po62

Pension Benefits and Other Postretirement Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	1,692	1,841	3,372	3,682
Expected return on plan assets	(2,164)	(2,309)	(4,333)	(4,618)
Amortization of prior service credit	0	0	0	0
Amortization of net loss (gain)	457	433	913	866
Net periodic (benefit) cost	(15)	(35)	(48)	(70)
Retirement Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	17	17	38	56
Interest cost	16	13	31	31
Expected return on plan assets	0	0	0	0
Amortization of prior service credit	(400)	(407)	(801)	(780)
Amortization of net loss (gain)	0	(17)	0	(31)
Net periodic (benefit) cost	$ (367)	$ (394)	$ (732)	$ (724)

Segment Information (Income by

Segment Information (Income by Reportable Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Net sales	$ 214,675	$ 201,424	$ 429,286	$ 405,252
Operating income	25,224	32,314	56,269	71,351
Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	76,376	74,340	149,831	152,882
Operating income	10,594	12,997	18,496	32,495
Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	79,216	77,585	157,299	154,434
Operating income	8,421	13,934	22,581	26,724
Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	53,647	43,905	111,360	86,557
Operating income	4,239	3,560	11,260	8,404
Other
Segment Reporting Information [Line Items]
Net sales	5,436	5,594	10,796	11,379
Operating income	1,970	1,823	3,932	3,728
Recognized over time
Segment Reporting Information [Line Items]
Net sales	58,575	48,565	121,657	96,601
Recognized over time | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	0	0	0	0
Recognized over time | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	907	415	1,941	1,082
Recognized over time | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	53,052	43,409	110,451	85,681
Recognized over time | Other
Segment Reporting Information [Line Items]
Net sales	4,616	4,741	9,265	9,838
Recognized at a point in time
Segment Reporting Information [Line Items]
Net sales	156,100	152,859	307,629	308,651
Recognized at a point in time | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	76,376	74,340	149,831	152,882
Recognized at a point in time | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	78,309	77,170	155,358	153,352
Recognized at a point in time | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	595	496	909	876
Recognized at a point in time | Other
Segment Reporting Information [Line Items]
Net sales	820	853	1,531	1,541
United States
Segment Reporting Information [Line Items]
Net sales	59,369	55,742	119,174	116,866
United States | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	14,447	11,372	26,725	24,595
United States | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	35,777	35,904	73,469	74,000
United States | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	8,279	7,118	16,857	15,708
United States | Other
Segment Reporting Information [Line Items]
Net sales	866	1,348	2,123	2,563
Other Americas
Segment Reporting Information [Line Items]
Net sales	3,985	4,598	6,800	8,124
Other Americas | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	758	1,158	1,584	1,725
Other Americas | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	2,179	2,989	3,980	5,461
Other Americas | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	323	258	681	561
Other Americas | Other
Segment Reporting Information [Line Items]
Net sales	725	193	555	377
Total Americas
Segment Reporting Information [Line Items]
Net sales	63,354	60,340	125,974	124,990
Total Americas | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	15,205	12,530	28,309	26,320
Total Americas | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	37,956	38,893	77,449	79,461
Total Americas | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	8,602	7,376	17,538	16,269
Total Americas | Other
Segment Reporting Information [Line Items]
Net sales	1,591	1,541	2,678	2,940
China
Segment Reporting Information [Line Items]
Net sales	66,453	65,461	131,493	127,511
China | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	32,032	33,949	65,539	71,378
China | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	24,071	22,556	44,865	39,468
China | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	8,940	7,884	18,362	14,251
China | Other
Segment Reporting Information [Line Items]
Net sales	1,410	1,072	2,727	2,414
Other APAC
Segment Reporting Information [Line Items]
Net sales	34,653	31,835	66,395	63,738
Other APAC | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	18,588	16,984	33,926	32,911
Other APAC | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	8,324	8,693	17,484	18,635
Other APAC | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	7,092	5,156	13,543	10,275
Other APAC | Other
Segment Reporting Information [Line Items]
Net sales	649	1,002	1,442	1,917
Total APAC
Segment Reporting Information [Line Items]
Net sales	101,106	97,296	197,888	191,249
Total APAC | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	50,620	50,933	99,465	104,289
Total APAC | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	32,395	31,249	62,349	58,103
Total APAC | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	16,032	13,040	31,905	24,526
Total APAC | Other
Segment Reporting Information [Line Items]
Net sales	2,059	2,074	4,169	4,331
Germany
Segment Reporting Information [Line Items]
Net sales	24,105	22,679	47,976	43,166
Germany | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	4,823	6,786	11,073	12,862
Germany | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	2,595	2,355	5,337	4,648
Germany | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	16,524	13,380	31,234	25,315
Germany | Other
Segment Reporting Information [Line Items]
Net sales	163	158	332	341
Other EMEA
Segment Reporting Information [Line Items]
Net sales	26,110	21,109	57,448	45,847
Other EMEA | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	5,728	4,091	10,984	9,411
Other EMEA | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	6,270	5,088	12,164	12,222
Other EMEA | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	12,489	10,109	30,683	20,447
Other EMEA | Other
Segment Reporting Information [Line Items]
Net sales	1,623	1,821	3,617	3,767
Total EMEA
Segment Reporting Information [Line Items]
Net sales	50,215	43,788	105,424	89,013
Total EMEA | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	10,551	10,877	22,057	22,273
Total EMEA | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	8,865	7,443	17,501	16,870
Total EMEA | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	29,013	23,489	61,917	45,762
Total EMEA | Other
Segment Reporting Information [Line Items]
Net sales	$ 1,786	$ 1,979	$ 3,949	$ 4,108

Joint Ventures (Additional Info

Joint Ventures (Additional Information) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)joint_venture	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)joint_venture	Jun. 30, 2017USD ($)	Dec. 31, 2017USD ($)
Schedule of Equity Method Investments [Line Items]
Number of joint ventures that are 50% owned (entity) | joint_venture	2		2
Equity income related to joint ventures	$ 1,804	$ 966	$ 2,811	$ 1,976
Due from joint ventures, current	$ 3,000		$ 3,000		$ 3,700
Rogers INOAC Corporation (RIC)
Schedule of Equity Method Investments [Line Items]
Ownership interest in joint venture (percent)	50.00%		50.00%
Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Due to related parties, current	$ 1,900		$ 1,900		$ 2,100

Joint Ventures (Accounted for U

Joint Ventures (Accounted for Under Equity Method of Accounting) (Details)	6 Months Ended
	Jun. 30, 2018
Schedule of Equity Method Investments [Line Items]
Fiscal Year-End	--12-31
Rogers INOAC Corporation (RIC) | Japan | High Performance Foams
Schedule of Equity Method Investments [Line Items]
Fiscal Year-End	--10-31
Rogers INOAC Suzhou Corporation (RIS) | China | High Performance Foams
Schedule of Equity Method Investments [Line Items]
Fiscal Year-End	--12-31

Joint Ventures (Summarized Info

Joint Ventures (Summarized Information for Joint Ventures) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Equity Method Investments and Joint Ventures [Abstract]
Net sales	$ 14,907	$ 12,846	$ 28,232	$ 24,270
Gross profit	5,608	4,706	11,081	9,142
Net income	$ 3,609	$ 1,932	$ 5,622	$ 3,952

Debt (Additional Information) (

Debt (Additional Information) (Details)	Feb. 17, 2017USD ($)	Jun. 18, 2015	Jun. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Dec. 31, 2017USD ($)capital_lease_agreement
Debt Instrument [Line Items]
Outstanding line of credit issuance costs			$ 2,000,000	$ 2,000,000
Amortization expense			$ 100,000	$ 300,000	$ 200,000
Debt instrument, leverage ratio, maximum			2.75	2.75
Capital lease obligation			$ 700,000	$ 700,000
Amortization expense related to the capital lease			100,000
Capital lease accumulated depreciation			200,000	200,000
Interest expense on capital lease			100,000	100,000
Number of capital lease agreements | capital_lease_agreement						2
Maximum
Debt Instrument [Line Items]
Dividends				20,000,000
Credit Agreement
Debt Instrument [Line Items]
Variable rate lower range basis spread		37.50%
Variable rate higher range basis spread		75.00%
Line of credit, base reference rate description		The base reference rate is the greater of the prime rate; federal funds effective rate (or the overnight bank funding rate, if greater) plus 50 basis points; or adjusted 1-month LIBOR plus 100 basis points.
Amended Credit Facility | Federal Funds Effective Swap Rate
Debt Instrument [Line Items]
Variable rate lower range basis spread		0.50%
Amended Credit Facility | LIBOR
Debt Instrument [Line Items]
Variable rate higher range basis spread		1.00%
Third Amended Credit Agreement
Debt Instrument [Line Items]
Leverage ratio	3.25
One-time leverage ratio maximum option	3.50
ICR covenant limit	3
Eurocurrency loans | Credit Agreement
Debt Instrument [Line Items]
Line of credit, LIBOR rate, minimum spread		137.50%
Line of credit, LIBOR rate, maximum spread		175.00%
Revolving Credit Facility | Third Amended Credit Agreement
Debt Instrument [Line Items]
Debt instrument, term	5 years
Maximum borrowing capacity	$ 450,000,000
Additional borrowing capacity	$ 175,000,000
Outstanding borrowings			131,000,000	$ 131,000,000
Revolving Credit Facility | Third Amended Credit Agreement | Minimum
Debt Instrument [Line Items]
Unused capacity, commitment fee percentage				20.00%
Revolving Credit Facility | Third Amended Credit Agreement | Maximum
Debt Instrument [Line Items]
Unused capacity, commitment fee percentage				30.00%
Interest rate swap | Revolving Credit Facility | Third Amended Credit Agreement
Debt Instrument [Line Items]
Hedged balance on debt instrument					$ 75,000,000
Germany
Debt Instrument [Line Items]
Capital lease, expiration date				44,561
Capital lease obligation			5,300,000	$ 5,300,000
Amortization expense related to the capital lease			100,000	200,000
Capital lease accumulated depreciation			$ 3,100,000	$ 3,100,000		$ 3,300,000

Goodwill and Intangible Asset68

Goodwill and Intangible Assets (Changes in Carrying Amount of Goodwill by Segment) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)
Goodwill [Roll Forward]
December 31, 2017	$ 237,107
Foreign currency translation adjustment	(2,820)
June 30, 2018	234,287
Advanced Connectivity Solutions
Goodwill [Roll Forward]
December 31, 2017	51,693
Foreign currency translation adjustment	0
June 30, 2018	51,693
Elastomeric Material Solutions
Goodwill [Roll Forward]
December 31, 2017	111,575
Foreign currency translation adjustment	(707)
June 30, 2018	110,868
Power Electronics Solutions
Goodwill [Roll Forward]
December 31, 2017	71,615
Foreign currency translation adjustment	(2,113)
June 30, 2018	69,502
Other
Goodwill [Roll Forward]
December 31, 2017	2,224
Foreign currency translation adjustment	0
June 30, 2018	$ 2,224

Goodwill and Intangible Asset69

Goodwill and Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 211,199	$ 214,810
Accumulated Amortization	63,789	59,270
Total intangible Assets, Gross Carrying Amount	215,798	219,548
Net Carrying Amount	147,410	155,540
Indefinite-lived other intangible asset	4,599	4,738
Total intangible assets, Net Carrying Amount	152,009	160,278
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	127,885	128,907
Accumulated Amortization	25,815	22,514
Net Carrying Amount	102,070	106,393
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	72,374	73,891
Accumulated Amortization	35,175	33,491
Net Carrying Amount	37,199	40,400
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,180	10,213
Accumulated Amortization	2,649	2,157
Net Carrying Amount	7,531	8,056
Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	760	1,799
Accumulated Amortization	150	1,108
Net Carrying Amount	$ 610	$ 691

Goodwill and Intangible Asset70

Goodwill and Intangible Assets (Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 3.8	$ 3.8	$ 7.7	$ 7.1
Annual Future Amortization Expense
Anticipated future amortization expense for 2018	7.6		7.6
Anticipated future amortization expense for 2019	15		15
Anticipated future amortization expense for 2020	11.7		11.7
Anticipated future amortization expense for 2021	11		11
Anticipated future amortization expense for 2022	$ 10.6		$ 10.6

Goodwill and Intangible Asset71

Goodwill and Intangible Assets (Weighted Average Amortization Period by Intangible Asset Class) (Details)	6 Months Ended
	Jun. 30, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period	7 years 8 months 12 days
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period	8 years 11 months
Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period	4 years 9 months 18 days
Trademarks and trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period	5 years 11 months
Covenants not to compete
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period	1 year 8 months

Commitments and Contingencies72

Commitments and Contingencies (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018USD ($)	Jun. 30, 2018USD ($)claims	Dec. 31, 2017USD ($)
Loss Contingencies [Line Items]
Number of claims dismissed | claims		110
Number of claims settled (claim) | claims		17
Claims settlements amount		$ 4.9
Asbestos-related claims	$ 75.7	$ 75.7	$ 76.2
Recorded third-party environmental recoveries receivable			$ 69.2
Primary coverage period		8 years
Excess coverage period		2 years
Indemnity and defense costs	0.2	$ 0.5
Connecticut Voluntary Corrective Action Program
Loss Contingencies [Line Items]
Environmental remediation expense		0.7
Estimated total cleanup costs, accrual	1.7	1.7
PCB Contamination Proceedings
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	$ 0.2	$ 0.2

Commitments and Contingencies73

Commitments and Contingencies (Schedule of Loss Contingencies) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018USD ($)claims
Liability for Asbestos and Environmental Claims [Roll Forward]
Claims outstanding at December 31, 2017	687
New claims filed	126
Pending claims concluded	(127)
Claims outstanding at June 30, 2018	686
Number of claims dismissed	110
Number of claims settled (claim)	17
Claims settlements amount | $	$ 4.9

Commitments and Contingencies74

Commitments and Contingencies (Schedule of Total Estimated Liability for Asbestos) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Asbestos-related claims	$ 75.7	$ 76.2

Share Repurchases (Details)

Share Repurchases (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Aug. 06, 2015
Equity [Abstract]
Authorized stock repurchase amount			$ 100,000,000
Remaining authorized stock repurchase amount	$ 49,000,000	$ 49,000,000
Shares of capital stock repurchased	0	23,000
Value of capital stock repurchased	$ 0	$ 2,999,000

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Effective tax rate (percent)	32.60%	33.90%	23.20%	33.00%
Unrecognized tax benefits	$ 12.4		$ 12.4
Unrecognized tax benefits that would decrease the effective tax rate if recognized	10.9		10.9
Unrecognized tax benefits that could be recognized within 12 months	3.6		3.6
Unrecognized tax benefits, penalties accrued	$ 0.7		$ 0.7

Restructuring and Impairment 77

Restructuring and Impairment Charges - Narrative (Details) - USD ($) $ in Millions	Apr. 24, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 2
Restructuring costs	1.2
Severance and retention expenses	$ 0.8
Arizona
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 0.1	$ 1.1	$ 0.5	$ 1.8
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0.3		0.3
Restructuring charges, fair value		1.1
Restructuring costs		0	$ 0.1	$ 0.1	$ 0.3
Facility Consolidation
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 0.5
Forecast
Restructuring Cost and Reserve [Line Items]
Expected cost to be paid						$ 1.5	$ 0.5
Minimum | Forecast
Restructuring Cost and Reserve [Line Items]
Estimated capital expenditures						1.2
Maximum | Forecast
Restructuring Cost and Reserve [Line Items]
Estimated capital expenditures						$ 1.4

Restructuring and Impairment 78

Restructuring and Impairment Charges - Schedule of Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring Reserve [Roll Forward]
Provisions	$ 541	$ 1,079	$ 963	$ 1,805
Employee Severance
Restructuring Reserve [Roll Forward]
Beginning balance			183
Provisions			99
Payments			(244)
Ending balance	38		38
Facility Consolidation
Restructuring Reserve [Roll Forward]
Beginning balance			0
Provisions			316
Payments			(14)
Ending balance	$ 302		$ 302

Assets Held for Sale - Narrativ

Assets Held for Sale - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Assets held for sale	$ 381			$ 381		$ 896
Gain (loss) on disposition of assets	383	$ 0	$ (942)
Gain on sale of property				383	$ 942
United States
Property, Plant and Equipment [Line Items]
Assets held for sale		$ 900			$ 900
Arizona
Property, Plant and Equipment [Line Items]
Assets held for sale	400			$ 400
Gain (loss) on disposition of assets	$ 400

Revenue from Contracts with C80

Revenue from Contracts with Customers - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 732,217		$ 684,540
Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 732,217	$ 688,752
Minimum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Remaining performance obligation, expected timing of satisfaction, period	30 days
Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Remaining performance obligation, expected timing of satisfaction, period	105 days

Revenue from Contracts with C81

Revenue from Contracts with Customers - Contract Assets and Liabilities (Details) $ in Thousands	Jun. 30, 2018USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract Assets	$ 21,933
Advanced Connectivity Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract Assets	0
Elastomeric Material Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract Assets	384
Power Electronics Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract Assets	18,126
Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract Assets	$ 3,423

Revenue from Contracts with C82

Revenue from Contracts with Customers - Impact of Adoption of New Accounting Principle (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Condensed Consolidated Statements of Financial Position:
Inventory	$ 117,739		$ 117,739			$ 112,557
Retained earnings	732,217		732,217			684,540
Condensed Consolidated Statement of Income
Net sales	214,675	$ 201,424	429,286	$ 405,252
Cost of sales	138,003	120,878	276,007	244,356
Income tax expense	8,373	10,697	13,144	23,583
Net income	$ 17,329	$ 20,896	$ 43,465	$ 47,928
Basic earnings per share (in dollars per share)	$ 0.94	$ 1.15	$ 2.37	$ 2.65
Diluted earnings per share (in dollars per share)	$ 0.93	$ 1.13	$ 2.33	$ 2.60
Condensed Consolidated Statement of Cash Flows:
Deferred income taxes			$ 3,879	$ 4,813
Contract assets			(21,933)	0
Inventories			(6,489)	(6,464)
Other, net			3,287	1,703
Net cash provided by operating activities			22,818	$ 64,489
Accounting Standards Update 2014-09
Condensed Consolidated Statements of Financial Position:
Contract assets	$ 21,933		21,933		$ 18,099
Inventory	117,739		117,739		100,250
Deferred income taxes	3,501		3,501		12,286
Retained earnings	732,217		732,217		688,752
Under ASC 605
Condensed Consolidated Statement of Income
Net sales	214,782		425,452
Cost of sales	138,076		273,400
Income tax expense	8,373		12,811
Net income	$ 17,363		$ 42,571
Basic earnings per share (in dollars per share)	$ 0.94		$ 2.32
Diluted earnings per share (in dollars per share)	$ 0.93		$ 2.28
Condensed Consolidated Statement of Cash Flows:
Deferred income taxes			$ 3,546
Contract assets			0
Inventories			(21,403)
Other, net			(2,505)
Net cash provided by operating activities			22,818
Under ASC 605 | Accounting Standards Update 2014-09
Condensed Consolidated Statements of Financial Position:
Contract assets	$ 0		0			0
Inventory	132,653		132,653			112,557
Deferred income taxes	1,588		1,588			10,706
Retained earnings	727,111		727,111			$ 684,540
Impact of Adoption
Condensed Consolidated Statement of Income
Net sales	(107)		3,834
Cost of sales	(73)		2,607
Income tax expense	0		333
Net income	$ (34)		$ 894
Basic earnings per share (in dollars per share)	$ 0		$ 0.05
Diluted earnings per share (in dollars per share)	$ 0		$ 0.05
Condensed Consolidated Statement of Cash Flows:
Deferred income taxes			$ 333
Contract assets			(21,933)
Inventories			14,914
Other, net			5,792
Net cash provided by operating activities			0
Impact of Adoption | Accounting Standards Update 2014-09
Condensed Consolidated Statements of Financial Position:
Contract assets	$ 21,933		21,933		18,099
Inventory	(14,914)		(14,914)		(12,307)
Deferred income taxes	1,913		1,913		1,580
Retained earnings	$ 5,106		$ 5,106		$ 4,212

Supplemental Financial Inform83

Supplemental Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018
Long Lived Assets Held-for-sale [Line Items]
Gain from antitrust litigation settlement	$ 0			$ (3,591)
Gain (loss) on disposition of assets	383	$ 0	$ (942)
Arizona
Long Lived Assets Held-for-sale [Line Items]
Gain (loss) on disposition of assets	$ 400
Belgium
Long Lived Assets Held-for-sale [Line Items]
Gain (loss) on disposition of assets			$ 942

Recent Accounting Pronouncement

Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Selling, general and administrative expenses	$ 42,540	$ 40,012	$ 83,137	$ 74,580
Other income (expense), net	$ (34)	260	$ 32	1,379
Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Selling, general and administrative expenses		$ (400)		(800)
Other income (expense), net				$ 400

Subsequent Events - Narrative (

Subsequent Events - Narrative (Details) - Griswold - Subsequent Event $ in Millions	Jul. 06, 2018USD ($)
Subsequent Event [Line Items]
Business acquisition, percentage of voting interests acquired	100.00%
Consideration transferred	$ 77.9
Earn out payment	3
Revolving Credit Facility
Subsequent Event [Line Items]
Outstanding borrowings	$ 82.5