Rogers (ROG) 10-Q31 Oct 192019 Q3 Quarterly reportFinancial data

Company Profile

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2019	Oct. 25, 2019
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Entity File Number	1-4347
Entity Registrant Name	ROGERS CORP
Entity Incorporation, State or Country Code	MA
Entity Tax Identification Number	06-0513860
Entity Address, Address Line One	2225 W. Chandler Blvd.
Entity Address, City or Town	Chandler
Entity Address, State or Province	AZ
Entity Address, Postal Zip Code	85224-6155
City Area Code	480
Local Phone Number	917-6000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		18,572,454
Entity Central Index Key	0000084748
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Amendment Flag	false
New York Stock Exchange
Entity Information [Line Items]
Title of 12(b) Security	Common Stock,
Entity Trading Symbol	ROG
Security Exchange Name	NYSE

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net sales	$ 221,842	$ 226,863	$ 704,492	$ 656,149
Cost of sales	142,975	147,733	454,403	423,741
Gross margin	78,867	79,130	250,089	232,408
Selling, general and administrative expenses	40,448	39,943	127,349	123,080
Research and development expenses	7,830	7,630	23,282	24,514
Restructuring and impairment charges	580	1,052	2,485	2,015
Other operating (income) expense, net	124	863	1,075	(3,111)
Operating income	29,885	29,642	95,898	85,910
Equity income in unconsolidated joint ventures	1,498	1,642	4,077	4,453
Other income (expense), net	(918)	(680)	(915)	(647)
Interest expense, net	(1,747)	(2,000)	(5,723)	(4,503)
Income before income tax expense	28,718	28,604	93,337	85,213
Income tax expense	5,331	8,870	17,258	22,014
Net income	$ 23,387	$ 19,734	$ 76,079	$ 63,199
Basic earnings per share (in dollars per share)	$ 1.26	$ 1.07	$ 4.10	$ 3.44
Diluted earnings per share (in dollars per share)	$ 1.25	$ 1.06	$ 4.07	$ 3.39
Shares used in computing:
Basic earnings per share (in shares)	18,581	18,403	18,569	18,360
Diluted earnings per share (in shares)	18,724	18,678	18,715	18,649

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 23,387	$ 19,734	$ 76,079	$ 63,199
Foreign currency translation adjustment	(10,187)	(1,608)	(12,262)	(9,901)
Derivative instrument designated as cash flow hedge:
Change in unrealized gain (loss) before reclassifications, net of tax (Note 4)	(158)	263	(1,362)	1,416
Unrealized (gain) reclassified into earnings, net of tax (Note 4)	(32)	(52)	(188)	(108)
Pension and other postretirement benefits:
Amortization of loss, net of tax (Note 4)	172	44	485	131
Other comprehensive income (loss)	(10,205)	(1,353)	(13,327)	(8,462)
Comprehensive income	$ 13,182	$ 18,381	$ 62,752	$ 54,737

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 140,747	$ 167,738
Accounts receivable, less allowance for doubtful accounts of $1,353 and $1,354	138,532	144,623
Contract assets	24,070	22,728
Inventories	137,908	132,637
Prepaid income taxes	3,761	3,093
Asbestos-related insurance receivables, current portion	4,138	4,138
Other current assets	9,336	10,829
Total current assets	458,492	485,786
Property, plant and equipment, net of accumulated depreciation of $333,882 and $317,414	252,393	242,759
Investments in unconsolidated joint ventures	15,033	18,667
Deferred income taxes	12,166	8,236
Goodwill	260,552	264,885
Other intangible assets, net of amortization	162,939	177,008
Pension assets	20,236	19,273
Asbestos-related insurance receivables, non-current portion	60,247	59,685
Other long-term assets	7,660	3,045
Total assets	1,249,718	1,279,344
Current liabilities
Accounts payable	38,608	40,321
Accrued employee benefits and compensation	31,722	30,491
Accrued income taxes payable	9,642	7,032
Asbestos-related liabilities, current portion	5,547	5,547
Other accrued liabilities	19,670	23,789
Total current liabilities	105,189	107,180
Borrowings under revolving credit facility	130,482	228,482
Pension and other postretirement benefits liabilities	1,739	1,739
Asbestos-related liabilities, non-current portion	65,104	64,799
Non-current income tax	9,296	8,418
Deferred income taxes	8,556	10,806
Other long-term liabilities	14,718	9,596
Commitments and contingencies (Note 13)
Shareholders’ equity
Capital stock - $1 par value; 50,000 authorized shares; 18,572 and 18,395 shares issued and outstanding	18,572	18,395
Additional paid-in capital	135,761	132,360
Retained earnings	852,462	776,403
Accumulated other comprehensive loss	(92,161)	(78,834)
Total shareholders' equity	914,634	848,324
Total liabilities and shareholders' equity	$ 1,249,718	$ 1,279,344

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 1,353	$ 1,354
Accumulated depreciation	$ 333,882	$ 317,414
Capital Stock, par value (in dollars per share)	$ 1	$ 1
Capital Stock, authorized shares (shares)	50,000,000	50,000,000
Capital Stock, shares issued (shares)	18,572,000	18,395,000
Capital Stock, shares outstanding (shares)	18,572,000	18,395,000

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating Activities:
Net income	$ 76,079	$ 63,199
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	37,176	35,320
Equity compensation expense	9,294	8,536
Deferred income taxes	(5,565)	(17)
Equity in undistributed income of unconsolidated joint ventures	(4,077)	(4,453)
Dividends received from unconsolidated joint ventures	5,375	4,431
Pension and other postretirement benefits	(503)	(1,193)
Asbestos-related charges	67	0
Loss (gain) on sale or disposal of property, plant and equipment	278	(161)
Impairment charges	1,537	477
Provision (benefit) for doubtful accounts	16	(264)
Changes in assets and liabilities:
Accounts receivable	3,668	(14,012)
Contract assets	(1,342)	(20,260)
Inventories	(7,788)	(11,840)
Pension and postretirement benefit contributions	(16)	(25,347)
Other current assets	641	146
Accounts payable and other accrued expenses	(2,552)	(4,354)
Other, net	3,384	3,216
Net cash provided by operating activities	115,672	33,424
Investing Activities:
Acquisition of business, net of cash received	0	(78,571)
Isola asset acquisition	0	(43,434)
Capital expenditures	(38,827)	(36,557)
Proceeds from the sale of property, plant and equipment, net	9	1,027
Return of capital from unconsolidated joint ventures	2,625	0
Net cash used in investing activities	(36,193)	(157,535)
Financing Activities:
Proceeds from borrowings under revolving credit facility	0	102,500
Repayment of debt principal and finance lease obligations	(98,294)	(1,046)
Payments of taxes related to net share settlement of equity awards	(7,309)	(6,492)
Proceeds from the exercise of stock options, net	344	734
Proceeds from issuance of shares to employee stock purchase plan	1,249	1,082
Share repurchases	0	(2,999)
Net cash (used in) provided by financing activities	(104,010)	93,779
Effect of exchange rate fluctuations on cash	(2,460)	(1,271)
Net decrease in cash and cash equivalents	(26,991)	(31,603)
Cash and cash equivalents at beginning of period	167,738	181,159
Cash and cash equivalents at end of period	140,747	149,556
Supplemental Disclosures:
Accrued capital additions	1,999	2,099
Interest, net of amounts capitalized	6,449	4,662
Income taxes	$ 16,018	$ 23,357

CONDENSED CONSOLIDATED STATEM_6

CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Capital Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Balance, beginning of period at Dec. 31, 2017		$ 18,255	$ 128,933	$ 684,540	$ (65,155)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for vested restricted stock units, net of cancellations for tax withholding		115	(6,607)
Stock options exercised		19	715
Shares issued for employee stock purchase plan		12	1,070
Shares issued to directors		12	(12)
Shares repurchased	$ (3,000)	(23)	(2,976)
Equity compensation expense			8,536
Net income	63,199			63,199
Other comprehensive income (loss)	(8,462)				(8,462)
Balance, end of period at Sep. 30, 2018	826,383	18,390	129,659	751,951	(73,617)
Balance, beginning of period at Jun. 30, 2018		18,380	126,452	732,217	(72,264)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for vested restricted stock units, net of cancellations for tax withholding		2	(67)
Stock options exercised		1	35
Shares issued for employee stock purchase plan		6	518
Shares issued to directors		1	(1)
Shares repurchased		0	0
Equity compensation expense			2,722
Net income	19,734			19,734
Other comprehensive income (loss)	(1,353)				(1,353)
Balance, end of period at Sep. 30, 2018	826,383	18,390	129,659	751,951	(73,617)
Balance, beginning of period at Dec. 31, 2018	848,324	18,395	132,360	776,403	(78,834)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for vested restricted stock units, net of cancellations for tax withholding		139	(7,448)
Stock options exercised		11	333
Shares issued for employee stock purchase plan		15	1,234
Shares issued to directors		12	(12)
Shares repurchased		0	0
Equity compensation expense			9,294
Net income	76,079			76,079
Other comprehensive income (loss)	(13,327)				(13,327)
Balance, end of period at Sep. 30, 2019	914,634	18,572	135,761	852,462	(92,161)
Balance, beginning of period at Jun. 30, 2019		18,559	131,836	829,075	(81,956)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for vested restricted stock units, net of cancellations for tax withholding		2	113
Stock options exercised		1	16
Shares issued for employee stock purchase plan		8	647
Shares issued to directors		2	(2)
Shares repurchased		0	0
Equity compensation expense			3,151
Net income	23,387			23,387
Other comprehensive income (loss)	(10,205)				(10,205)
Balance, end of period at Sep. 30, 2019	$ 914,634	$ 18,572	$ 135,761	$ 852,462	$ (92,161)

Basis of Presentation

Basis of Presentation	9 Months Ended
Basis of Presentation	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Note 1 – 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. 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 year ended December 31, 2018 .

Fair Value Measurements

Fair Value Measurements	9 Months Ended
Fair Value Measurements	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 2 – 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, include: Derivative Instruments at Fair Value as of September 30, 2019 (Dollars in thousands) Level 1 Level 2 Level 3 Total Foreign currency contracts $ — $ 189 $ — $ 189 Copper derivative contracts $ — $ 518 $ — $ 518 Interest rate swap $ — $ (1,524 ) $ — $ (1,524 ) Derivative Instruments at Fair Value as of December 31, 2018 (Dollars in thousands) Level 1 Level 2 Level 3 Total Foreign currency contracts $ — $ 522 $ — $ 522 Copper derivative contracts $ — $ 583 $ — $ 583 Interest rate swap $ — $ 461 $ — $ 461 For further discussion on our derivative contracts, refer to “ Note 3 – Hedging Transactions and Derivative Financial Instruments .”

Hedging Transactions and Deriva

Hedging Transactions and Derivative Financial Instruments	9 Months Ended
Hedging Transactions and Derivative Financial Instruments	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Hedging Transactions and Derivative Financial Instruments	Note 3 – 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, which are collectively a function of five primary variables: price of the underlying instrument, time to expiration, strike price, interest rate and volatility. 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 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. • 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 September 30, 2019 and 2018 , only our interest rate swap qualified for hedge accounting treatment as a cash flow hedge, and the hedge was highly effective. Foreign Currency During the three months ended September 30, 2019 , we entered into Chinese Renminbi, Euro, Korean Won, and Japanese Yuan 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 in the period in which the adjustment occurred. As of September 30, 2019 , the notional values of the remaining foreign currency forward contracts were: Notional Values of Foreign Currency Derivatives USD/CNY $ 6,506,000 KRW/USD ₩ 5,979,000,000 Commodity As of September 30, 2019 , we had 27 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 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 occurred. As of September 30, 2019 , the volume of our copper contracts outstanding was as follows: Volume of Copper Derivatives October 2019 - December 2019 195 metric tons per month January 2020 - March 2020 202 metric tons per month April 2020 - June 2020 202 metric tons per month July 2020 - September 2020 201 metric tons per month October 2020 - December 2020 201 metric tons per month Interest Rates 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. This transaction has been designated as a cash flow hedge and qualifies for hedge accounting treatment. For additional information regarding our revolving credit facility, refer to “ Note 10 – Debt .” Effects on Financial Statements (Dollars in thousands) The Effect of Current Derivative Instruments on the Financial Statements for the Period Ended September 30, 2019 Fair Values of Derivative Instruments as of September 30, 2019 Gain (Loss) Other Assets/ (Other Liabilities) (1) Location Three Months Ended Nine Months Ended Foreign Currency Contracts Contracts not designated as hedging instruments Other income (expense), net $ 181 $ (406 ) $ 189 Copper Derivative Contracts Contracts not designated as hedging instruments Other income (expense), net $ (543 ) $ (1,008 ) $ 518 Interest Rate Swap Contract designated as hedging instrument Other comprehensive income (loss) $ (240 ) $ (1,985 ) $ (1,524 ) (Dollars in thousands) The Effect of Current Derivative Instruments on the Financial Statements for the Period Ended September 30, 2018 Fair Values of Derivative Instruments as of September 30, 2018 Gain (Loss) Other Assets/(Other Liabilities) (1) Location Three Months Ended Nine Months Ended Foreign Currency Contracts Contracts not designated as hedging instruments Other income (expense), net $ 29 $ (95 ) $ 342 Copper Derivative Contracts Contracts not designated as hedging instruments Other income (expense), net $ (453 ) $ (1,637 ) $ 631 Interest Rate Swap Contract designated as hedging instrument Other comprehensive income (loss) $ 270 $ 1,669 $ 1,710 (1) All balances were recorded in the “Other current assets” or “Other accrued liabilities” line items in the consolidated statements of financial position, except the 2019 interest rate swap balance, which was recorded in the “Other long-term liabilities” line item in the condensed consolidated statements of financial position.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	9 Months Ended
Accumulated Other Comprehensive Loss	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Loss	Note 4 – Accumulated Other Comprehensive Loss The changes in accumulated other comprehensive loss by component for the nine months ended September 30, 2019 and 2018 were as follows: (Dollars and accompanying footnotes in thousands) Foreign Currency Translation Adjustments Pension and Other Postretirement Benefits (1) Derivative Instrument Designated as Cash Flow Hedge (2) Total Balance as of December 31, 2018 $ (30,488 ) $ (48,700 ) $ 354 $ (78,834 ) Other comprehensive income (loss) before reclassifications (12,262 ) — (1,362 ) (13,624 ) Amounts reclassified from accumulated other comprehensive loss — 485 (188 ) 297 Net current-period other comprehensive income (loss) (12,262 ) 485 (1,550 ) (13,327 ) Balance as of September 30, 2019 $ (42,750 ) $ (48,215 ) $ (1,196 ) $ (92,161 ) Balance as of December 31, 2017 $ (17,983 ) $ (47,198 ) $ 26 $ (65,155 ) Other comprehensive income (loss) before reclassifications (9,901 ) — 1,416 (8,485 ) Amounts reclassified from accumulated other comprehensive loss — 131 (108 ) 23 Net current-period other comprehensive income (loss) (9,901 ) 131 1,308 (8,462 ) Balance as of September 30, 2018 $ (27,884 ) $ (47,067 ) $ 1,334 $ (73,617 ) (1) Net of tax benefits of $9,851 and $9,984 as of September 30, 2019 and December 31, 2018 , respectively. Net of tax benefits of $9,523 and $9,563 as of September 30, 2018 and December 31, 2017 , respectively. (2) Net of tax benefits (expenses) of $329 and ($106) as of September 30, 2019 and December 31, 2018 , respectively. Net of tax expenses of ($375) and ($15) as of September 30, 2018 and December 31, 2017 , respectively.

Acquisitions

Acquisitions	9 Months Ended
Acquisitions	Sep. 30, 2019
Business Combinations [Abstract]
Acquisitions	Note 5 – Acquisitions Griswold LLC On July 6, 2018, we acquired 100% of the membership interests in Griswold LLC (Griswold) for an aggregate purchase price of $78.0 million , net of cash acquired. Pro Forma Financial Information The following unaudited pro forma financial information presents the combined results of operations of Rogers and Griswold as if the Griswold acquisition had occurred on January 1, 2017. The unaudited pro forma financial information is not intended to represent or be indicative of our consolidated results of operations that would have been reported had the Griswold acquisition been completed as of January 1, 2017, and should not be taken as indicative of our future consolidated results of operations. Three Months Ended Nine Months Ended (Dollars in thousands) September 30, 2018 September 30, 2018 Net sales $ 226,863 $ 670,936 Net income 20,765 63,201

Inventories

Inventories	9 Months Ended
Inventories	Sep. 30, 2019
Inventory Disclosure [Abstract]
Inventories	Note 6 – Inventories Inventories are valued at the lower of cost or net realizable value. Inventories consisted of the following: (Dollars in thousands) September 30, 2019 December 31, 2018 Raw materials $ 67,150 $ 59,321 Work-in-process 32,247 30,086 Finished goods 38,511 43,230 Total inventories $ 137,908 $ 132,637

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	9 Months Ended
Goodwill and Other Intangible Assets	Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Note 7 – Goodwill and Other Intangible Assets Goodwill The changes in the carrying amount of goodwill from December 31, 2018 to September 30, 2019 by operating segment, were as follows: (Dollars in thousands) Advanced Connectivity Solutions Elastomeric Material Solutions Power Electronics Solutions Other Total December 31, 2018 $ 51,693 $ 142,589 $ 68,379 $ 2,224 $ 264,885 Foreign currency translation adjustment — (1,073 ) (3,260 ) — (4,333 ) September 30, 2019 $ 51,693 $ 141,516 $ 65,119 $ 2,224 $ 260,552 Other Intangible Assets The gross carrying amount, accumulated amortization and net carrying amount of other intangible assets as of September 30, 2019 and December 31, 2018 by classification type, were as follows: September 30, 2019 December 31, 2018 (Dollars in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer relationships $ 148,800 $ 36,413 $ 112,387 $ 149,753 $ 30,078 $ 119,675 Technology 80,163 42,736 37,427 81,535 38,624 42,911 Trademarks and trade names 11,970 4,053 7,917 12,019 3,213 8,806 Covenants not to compete 1,340 441 899 1,340 249 1,091 Total definite-lived other intangible assets 242,273 83,643 158,630 244,647 72,164 172,483 Indefinite-lived other intangible asset 4,309 — 4,309 4,525 — 4,525 Total other intangible assets $ 246,582 $ 83,643 $ 162,939 $ 249,172 $ 72,164 $ 177,008 In the table above, gross carrying amounts and accumulated amortization may differ from prior periods due to foreign exchange rate fluctuations. Amortization expense for the three and nine months ended September 30, 2019 was approximately $4.4 million and $13.3 million , respectively. Amortization expense for the three and nine months ended September 30, 2018 was approximately $4.4 million and $12.1 million , respectively. The estimated future amortization expense is $4.4 million for the remainder of 2019 and $14.5 million , $13.8 million , $13.3 million and $12.7 million for 2020, 2021, 2022 and 2023, respectively. The weighted average amortization period as of September 30, 2019 , 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 7.4 years Technology 4.2 years Trademarks and trade names 4.9 years Covenants not to compete 1.7 years Total definite-lived other intangible assets 6.4 years

Earnings Per Share

Earnings Per Share	9 Months Ended
Earnings Per Share	Sep. 30, 2019
Earnings Per Share [Abstract]
Earnings Per Share	Note 8 – Earnings Per Share Basic earnings per share is based on the weighted average number of common shares outstanding. Diluted earnings per share is based on the weighted average number of common shares outstanding and all dilutive potential common shares outstanding. The following table sets forth the computation of basic and diluted earnings per share for the periods indicated: (In thousands, except per share amounts) Three Months Ended Nine Months Ended September 30, 2019 September 30, 2018 September 30, 2019 September 30, 2018 Numerator: Net income $ 23,387 $ 19,734 $ 76,079 $ 63,199 Denominator: Weighted-average shares outstanding - basic 18,581 18,403 18,569 18,360 Effect of dilutive shares 143 275 146 289 Weighted-average shares outstanding - diluted 18,724 18,678 18,715 18,649 Basic earnings per share $ 1.26 $ 1.07 $ 4.10 $ 3.44 Diluted earnings per share $ 1.25 $ 1.06 $ 4.07 $ 3.39 Dilutive shares are calculated using the treasury stock method and primarily include unvested restricted stock units. Anti-dilutive shares are excluded from the calculation of diluted shares and diluted earnings per share. For the three months ended September 30, 2019 and 2018 , 3,173 shares and 37,700 shares were excluded, respectively.

Capital Stock and Equity Compen

Capital Stock and Equity Compensation	9 Months Ended
Capital Stock and Equity Compensation	Sep. 30, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]
Capital Stock and Equity Compensation	Note 9 – Capital Stock and Equity Compensation Equity Compensation Performance-Based Restricted Stock Units As of September 30, 2019 , we had performance-based restricted stock units from 2019, 2018 and 2017 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 outstanding awards have one measurement criterion: the three year total shareholder return (TSR) on our capital stock as compared to that of a specified group of peer companies. The TSR measurement criterion of the awards is considered a market condition. As such, the fair value of this measurement criterion 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 are the assumptions used in the Monte Carlo calculation on the respective grant dates for awards granted in 2019 and 2018: June 3, 2019 February 7, 2019 September 17, 2018 February 8, 2018 Expected volatility 39.7% 36.7% 36.6% 34.8% Expected term (in years) 2.6 2.9 3.0 3.0 Risk-free interest rate 1.78% 2.43% 2.85% 2.28% Expected volatility – In determining expected volatility, we have considered a number of factors, including historical volatility. Expected term – We use the vesting 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 nine months ended September 30, 2019 : Performance-Based Awards outstanding as of December 31, 2018 142,434 Awards granted 112,160 Stock issued (131,650 ) Awards forfeited (11,549 ) Awards outstanding as of September 30, 2019 111,395 We recognized $1.5 million and $3.5 million of compensation expense for performance-based restricted stock units during the three and nine months ended September 30, 2019 , respectively. We recognized $1.3 million and $3.1 million of compensation expense for performance-based restricted stock units during the three and nine months ended September 30, 2018 , respectively. Time-Based Restricted Stock Units As of September 30, 2019 , we had time-based restricted stock unit awards from 2019, 2018 and 2017 outstanding. The outstanding awards all ratably vest on the first, second and third anniversaries of the original grant date. 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 subsequent to the last grant anniversary date. Each time-based restricted stock unit represents a right to receive one share of 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. A summary of activity of the outstanding time-based restricted stock units for the nine months ended September 30, 2019 is presented below: Time-Based Awards outstanding as of December 31, 2018 117,476 Awards granted 61,455 Stock issued (65,887 ) Awards forfeited (7,815 ) Awards outstanding as of September 30, 2019 105,229 We recognized $1.5 million and $4.4 million of compensation expense for time-based restricted stock units during the three and nine months ended September 30, 2019 , respectively. We recognized $1.4 million and $4.2 million of compensation expense for time-based restricted stock units during the three and nine months ended September 30, 2018 , 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 nine months ended September 30, 2019 : Deferred Stock Units Awards outstanding as of December 31, 2018 8,400 Awards granted 5,950 Stock issued (7,200 ) Awards outstanding as of September 30, 2019 7,150 We recognized no compensation expense related to deferred stock units during the three months ended September 30, 2019 and 2018 , respectively. We recognized $1.1 million and $0.9 million of compensation expense related to deferred stock units during the nine months ended September 30, 2019 and 2018 , respectively. Stock Options Stock options have been granted under various equity compensation plans. The maximum contractual term for all options is normally 10 years . All outstanding options are fully vested and exercisable. We have no t granted any stock options since the first quarter of 2012. During the nine months ended September 30, 2019 , 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 $1.6 million , and the total amount of cash received from the exercise of these options was $0.3 million . A summary of the activity under our stock option plans for the nine months ended September 30, 2019 is presented below: Options Outstanding Weighted- Average Exercise Price Per Share Weighted-Average Remaining Contractual Life in Years Aggregate Intrinsic Value Options outstanding, vested and exercisable as of December 31, 2018 10,950 $ 31.99 2.0 $ 734,469 Options exercised (10,650 ) $ 32.21 Options expired (300 ) $ 23.86 Options outstanding, vested and exercisable as of September 30, 2019 — $ — 0.0 $ — 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 model. We recognized an immaterial amount of equity compensation expense associated with the ESPP during each of the three- and nine-month periods ended September 30, 2019 and 2018 .

Debt

Debt	9 Months Ended
Debt	Sep. 30, 2019
Debt Disclosure [Abstract]
Debt	Note 10 – Debt In 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). In 2018, we borrowed $82.5 million under our revolving credit facility to fund the acquisition of Griswold and an additional $20.0 million to fund the Rogers Corporation Defined Benefit Pension Plan (Merged Plan) as part of the proposed plan termination process. 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 at 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. 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. Based on our leverage ratio as of September 30, 2019 , the spread was 137.5 basis points. We incurred interest expense on our outstanding debt of $1.8 million and $1.8 million during the three months ended September 30, 2019 and 2018 , respectively, and $6.1 million and $3.8 million during the nine months ended September 30, 2019 and 2018 , respectively. 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. We incurred immaterial unused commitment fees in each of the three- and nine-month periods ended September 30, 2019 and 2018 . 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 September 30, 2019 we had $130.5 million in outstanding borrowings under our revolving credit facility. However, we made discretionary principal payments totaling $98.0 million on our revolving credit facility during the nine months ended September 30, 2019 . As of September 30, 2019 , we had $1.3 million of outstanding line of credit issuance costs that will be amortized over the life of the Third Amended Credit Agreement. We recognized an immaterial amount of amortization expense for each of the three- and nine-month periods ended September 30, 2019 and 2018 , 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. For further information regarding the interest rate swap, refer to “ 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 September 30, 2019 .

Leases

Leases	9 Months Ended
Leases	Sep. 30, 2019
Leases [Abstract]
Leases	Note 11 - Leases We have a finance lease obligation related to our manufacturing facility in Eschenbach, Germany. Under the terms of the lease 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. Our finance lease obligation related to this facility was $4.5 million and $5.0 million as of September 30, 2019 and December 31, 2018 , respectively. The finance lease right-of-use asset balance for this facility was $6.2 million and $6.7 million as of September 30, 2019 and December 31, 2018 , respectively. All other finance lease obligations and finance lease right-of-use assets were cumulatively immaterial as of September 30, 2019 and December 31, 2018 . Accumulated amortization related to our finance lease right-of-use assets was $3.6 million and $3.5 million as of September 30, 2019 and December 31, 2018 , respectively. Amortization expense related to our finance lease right-of-use assets, which is primarily included in the “Cost of sales” line item of the condensed consolidated statements of operations, was immaterial for each of the three- and nine-month periods ended September 30, 2019 and 2018 . Interest expense related to our finance lease obligations, which is included in the “Interest expense, net” line item of the condensed consolidated statements of operations, was immaterial for each of the three- and nine-month periods ended September 30, 2019 and 2018 . Payments made on the principal portion of our finance lease obligations were immaterial for each of the three-and nine-month periods ended September 30, 2019 and 2018 . We have operating leases primarily related to building space and vehicles. Renewal options are included in the lease term to the extent we are reasonably certain to exercise the option. The exercise of lease renewal options is at our sole discretion. We account for lease components separately from non-lease components. The incremental borrowing rate represents our ability to borrow on a collateralized basis over a similar lease term. The following table includes our expenses and payments for operating leases for the three and nine months ended September 30, 2019 : (Dollars in thousands) Three Months Ended Nine Months Ended September 30, 2019 September 30, 2019 Operating leases expense 843 2,336 Short-term leases expense 68 150 Payments on operating lease obligations 719 2,243 As of September 30, 2019 and December 31, 2018 , our assets and liabilities balances related to finance and operating leases were as follows: (Dollars in thousands) Location in Statements of Financial Position September 30, 2019 December 31, 2018 Finance lease right-of-use assets Property, plant and equipment, net $ 6,186 $ 6,750 Operating lease right-of-use assets Other long-term assets $ 5,461 $ — Finance lease obligations, current portion Other accrued liabilities $ 404 $ 420 Finance lease obligations, non-current portion Other long-term liabilities $ 4,119 $ 4,629 Total finance lease obligations $ 4,523 $ 5,049 Operating lease obligations, current portion Other accrued liabilities $ 2,449 $ — Operating lease obligations, non-current portion Other long-term liabilities $ 3,031 $ — Total operating lease obligations $ 5,480 $ — Net Future Minimum Lease Payments The following table includes future minimum lease payments under finance and operating leases together with the present value of the net future minimum lease payments as of September 30, 2019 : (Dollars in thousands) Finance Operating Leases Leases Signed Less: Leases Not Yet Commenced Leases 2019 $ 143 $ 696 $ — $ 696 2020 500 2,630 — 2,630 2021 4,072 1,546 — 1,546 2022 — 802 — 802 2023 — 229 — 229 Thereafter — 31 — 31 Total Lease Payments 4,715 5,934 — 5,934 Less: Interest (192 ) (454 ) — (454 ) Present Value of Net Future Minimum Lease Payments $ 4,523 $ 5,480 $ — $ 5,480 The following table includes information regarding the lease term and discount rates utilized in the calculation of the present value of net future minimum lease payments: Finance Leases Operating Leases Weighted Average Remaining Lease Term 2.0 years 2.6 years Weighted Average Discount Rate 3.00% 6.08% Transition We adopted Accounting Standards Codification (ASC) 842, Leases , in the first quarter of 2019 using the optional transition method, which applies the new lease requirements through a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption without restatement of comparative periods. The guidance was applied to all leases that were not completed at the date of implementation. The adoption primarily affected our condensed consolidated statements of financial position through the recognition of $6.2 million of operating lease right-of-use assets and $6.2 million of operating lease obligations, as well as an immaterial impact to retained earnings, as of January 1, 2019. We recognized an immaterial amount of operating lease right-of-use assets and an immaterial amount of operating lease obligations during the three months ended September 30, 2019 . We recognized an additional $0.8 million of operating lease right-of-use assets and $0.8 million operating lease obligations during the nine months ended September 30, 2019 . The total operating lease right-of use assets and operating lease obligations recognized was $7.0 million and $7.0 million , respectively. Practical Expedients We have elected to recognize lease payments in the condensed consolidated statements of operations on a straight-line basis over the term of the lease for short-term leases. We also elected the package of practical expedients that allows us to carry forward the historical lease classification and accounting for indirect costs for any existing leases.
Leases	Note 11 - Leases We have a finance lease obligation related to our manufacturing facility in Eschenbach, Germany. Under the terms of the lease 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. Our finance lease obligation related to this facility was $4.5 million and $5.0 million as of September 30, 2019 and December 31, 2018 , respectively. The finance lease right-of-use asset balance for this facility was $6.2 million and $6.7 million as of September 30, 2019 and December 31, 2018 , respectively. All other finance lease obligations and finance lease right-of-use assets were cumulatively immaterial as of September 30, 2019 and December 31, 2018 . Accumulated amortization related to our finance lease right-of-use assets was $3.6 million and $3.5 million as of September 30, 2019 and December 31, 2018 , respectively. Amortization expense related to our finance lease right-of-use assets, which is primarily included in the “Cost of sales” line item of the condensed consolidated statements of operations, was immaterial for each of the three- and nine-month periods ended September 30, 2019 and 2018 . Interest expense related to our finance lease obligations, which is included in the “Interest expense, net” line item of the condensed consolidated statements of operations, was immaterial for each of the three- and nine-month periods ended September 30, 2019 and 2018 . Payments made on the principal portion of our finance lease obligations were immaterial for each of the three-and nine-month periods ended September 30, 2019 and 2018 . We have operating leases primarily related to building space and vehicles. Renewal options are included in the lease term to the extent we are reasonably certain to exercise the option. The exercise of lease renewal options is at our sole discretion. We account for lease components separately from non-lease components. The incremental borrowing rate represents our ability to borrow on a collateralized basis over a similar lease term. The following table includes our expenses and payments for operating leases for the three and nine months ended September 30, 2019 : (Dollars in thousands) Three Months Ended Nine Months Ended September 30, 2019 September 30, 2019 Operating leases expense 843 2,336 Short-term leases expense 68 150 Payments on operating lease obligations 719 2,243 As of September 30, 2019 and December 31, 2018 , our assets and liabilities balances related to finance and operating leases were as follows: (Dollars in thousands) Location in Statements of Financial Position September 30, 2019 December 31, 2018 Finance lease right-of-use assets Property, plant and equipment, net $ 6,186 $ 6,750 Operating lease right-of-use assets Other long-term assets $ 5,461 $ — Finance lease obligations, current portion Other accrued liabilities $ 404 $ 420 Finance lease obligations, non-current portion Other long-term liabilities $ 4,119 $ 4,629 Total finance lease obligations $ 4,523 $ 5,049 Operating lease obligations, current portion Other accrued liabilities $ 2,449 $ — Operating lease obligations, non-current portion Other long-term liabilities $ 3,031 $ — Total operating lease obligations $ 5,480 $ — Net Future Minimum Lease Payments The following table includes future minimum lease payments under finance and operating leases together with the present value of the net future minimum lease payments as of September 30, 2019 : (Dollars in thousands) Finance Operating Leases Leases Signed Less: Leases Not Yet Commenced Leases 2019 $ 143 $ 696 $ — $ 696 2020 500 2,630 — 2,630 2021 4,072 1,546 — 1,546 2022 — 802 — 802 2023 — 229 — 229 Thereafter — 31 — 31 Total Lease Payments 4,715 5,934 — 5,934 Less: Interest (192 ) (454 ) — (454 ) Present Value of Net Future Minimum Lease Payments $ 4,523 $ 5,480 $ — $ 5,480 The following table includes information regarding the lease term and discount rates utilized in the calculation of the present value of net future minimum lease payments: Finance Leases Operating Leases Weighted Average Remaining Lease Term 2.0 years 2.6 years Weighted Average Discount Rate 3.00% 6.08% Transition We adopted Accounting Standards Codification (ASC) 842, Leases , in the first quarter of 2019 using the optional transition method, which applies the new lease requirements through a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption without restatement of comparative periods. The guidance was applied to all leases that were not completed at the date of implementation. The adoption primarily affected our condensed consolidated statements of financial position through the recognition of $6.2 million of operating lease right-of-use assets and $6.2 million of operating lease obligations, as well as an immaterial impact to retained earnings, as of January 1, 2019. We recognized an immaterial amount of operating lease right-of-use assets and an immaterial amount of operating lease obligations during the three months ended September 30, 2019 . We recognized an additional $0.8 million of operating lease right-of-use assets and $0.8 million operating lease obligations during the nine months ended September 30, 2019 . The total operating lease right-of use assets and operating lease obligations recognized was $7.0 million and $7.0 million , respectively. Practical Expedients We have elected to recognize lease payments in the condensed consolidated statements of operations on a straight-line basis over the term of the lease for short-term leases. We also elected the package of practical expedients that allows us to carry forward the historical lease classification and accounting for indirect costs for any existing leases.

Pension Benefits and Other Post

Pension Benefits and Other Postretirement Benefit Plans	9 Months Ended
Pension Benefits and Other Postretirement Benefit Plans	Sep. 30, 2019
Defined Benefit Plan [Abstract]
Pension Benefit and Other Postretirement Benefit Plans	Note 12 – Pension Benefits and Other Postretirement Benefit Plans As of September 30, 2019 , we had two qualified noncontributory defined benefit pension plans: 1) the Rogers Corporation Employees’ Pension Plan (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 Merged 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 st for each respective plan year. We are required, as an employer, to: (a) recognize in our consolidated statements of financial position an asset for a plan’s overfunded status or a liability for a plan’s underfunded status; (b) measure a plan’s assets and our obligations that determine our funded status as of the end of the year; and (c) recognize changes in the funded status of a defined benefit postretirement plan in the year in which the changes occur and report these changes in accumulated other comprehensive loss. In addition, actuarial gains and losses that are not immediately recognized as net periodic pension cost are recognized as a component of accumulated other comprehensive loss and amortized into net periodic pension cost in future periods. Pension Plan Proposed Termination During the second quarter of 2019, following receipt of a determination letter from the Internal Revenue Service (IRS), the Company amended the Merged Plan to (a) terminate the Merged Plan (subject to discretionary approval by the Company’s Chief Executive Officer) and (b) add a lump sum distribution option in connection with the termination of the Merged Plan, if approved. The Company subsequently provided participants of the Merged Plan an option to elect either a lump sum distribution or an annuity. As of September 30, 2019, the Merged Plan was fully funded on a GAAP basis, the Company intended to terminate the Merged Plan (subject to final approval), and there were no plans to terminate the Union Plan. On October 17, 2019, the Company’s Chief Executive Officer approved the termination of the Merged Plan. The Company purchased a group annuity contract with an insurance company for all participants who did not elect a lump sum distribution, for approximately $124 million , with a cash settlement date of October 24, 2019. The insurance company will be responsible for administering and paying pension benefit payments effective January 1, 2020. The lump sum distributions, which totaled approximately $39 million , were paid out commencing on October 21, 2019, with the majority of payments completed as of October 30, 2019. The Company estimates it will make an additional $1 million of monthly pension benefit payments subsequent to the annuity purchase date during a transition period ending December 31, 2019. The Merged Plan has sufficient assets to satisfy all transaction obligations. The Company further anticipates that it will have approximately $7 million to $11 million of assets remaining in the Merged Plan after settlement of all of its obligations. In addition, the Company expects to record a total non-cash pre-tax settlement charge in connection with the termination of the Merged Plan of approximately $52 million to $56 million during the fourth quarter of 2019. This settlement charge includes the immediate recognition into expense of the related unrecognized losses within “Accumulated other comprehensive loss” on the consolidated statements of financial position as of the plan termination date. The settlement charge will be recognized in “Other income (expense), net” on the consolidated statements of operations. 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 Nine Months Ended Three Months Ended Nine Months Ended September 30, September 30, September 30, September 30, 2019 2018 2019 2018 2019 2018 2019 2018 Service cost $ — $ — $ — $ — $ 12 $ 17 $ 48 $ 55 Interest cost 1,790 1,692 5,359 5,064 14 16 44 47 Expected return of plan assets (2,187 ) (2,164 ) (6,571 ) (6,497 ) — — — — Amortization of prior service credit — — — — (252 ) (400 ) (758 ) (1,201 ) Amortization of net loss 476 457 1,386 1,370 — — — — Net periodic cost (benefit) $ 79 $ (15 ) $ 174 $ (63 ) $ (226 ) $ (367 ) $ (666 ) $ (1,099 ) Employer Contributions There were no required contributions to our qualified defined benefit pension plans for the three- or nine-month periods ended September 30, 2019 and 2018 , and we are not required to make additional contributions to these plans for the remainder of 2019 . No voluntary contributions were made to our qualified defined benefit pension plans for each of the three- and nine-month periods ended September 30, 2019 and we made a $25.0 million voluntary contribution to the Merged Plan during the three- and nine-month periods ended September 30, 2018 . As there is no funding requirement for the Nonqualified Plans or the Retiree Health and Life Insurance benefit plans, we fund the amount of benefit payments made during the year, which were immaterial for each of the three- and nine-month periods ended September 30, 2019 and 2018 .

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 13 – Commitments and Contingencies We are currently engaged in the following environmental and legal proceedings: 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 incurred an immaterial amount of aggregate remediation costs through September 30, 2019 , and the accrual for future remediation efforts is $1.6 million . Asbestos Overview 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 nine months ended September 30, 2019 : Asbestos Claims Claims outstanding as of December 31, 2018 745 New claims filed 228 Pending claims concluded (1) (147 ) Claims outstanding as of September 30, 2019 826 (1) For the nine months ended September 30, 2019 , 123 claims were dismissed and 24 claims were settled. Settlements totaled approximately $2.2 million for the nine months ended September 30, 2019 . Impact on Financial Statements 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. The liability projection period covers all current and future claims through 2058, which represents the expected end of our asbestos liability exposure with no further ongoing claims expected beyond that date. This conclusion was based 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 expected downward trend in claims due to the average age of our claimants, which is approaching the average life expectancy. To date, the defense and settlement costs of our asbestos-related product liability litigation have been substantially covered by insurance. Although we have exhausted coverage under some of our insurance policies, we believe that we have applicable primary, excess and/or umbrella coverage for claims arising with respect to most of the years during which we manufactured and marketed asbestos-containing products. 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 covered 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, and no carrier had informed us it intended to terminate the agreement. We expect to continue 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. We are responsible for uninsured defense, indemnity and settlement costs, and we incurred an immaterial amount of expenses for each of the three- and nine-month periods ended September 30, 2019 and 2018 , respectively, related primarily to such costs. The amounts recorded for the asbestos-related liability and the related insurance receivables are 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. As of September 30, 2019 and December 31, 2018 , our projected asbestos-related claims and insurance receivables were as follows: (Dollars in millions) September 30, 2019 December 31, 2018 Asbestos-related claims $ 70.7 $ 70.3 Asbestos-related insurance receivables $ 64.4 $ 63.8 General 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 will have a material adverse impact on our results of operations, financial position or cash flows.

Income Taxes

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Note 14 – Income Taxes Our effective income tax rate was 18.6% and 31.0% for the three months ended September 30, 2019 and 2018 , respectively. The decrease from the third quarter of 2018 was primarily due to the beneficial impact of the international tax provisions from U.S. tax reform as a result of administrative guidance issued during the second half of 2018, changes in valuation allowance related to R&D credits, changes in pretax mix across jurisdictions with disparate tax rates and a lower tax impact on unremitted foreign earnings and profits, partially offset by an increase in taxes on foreign distributions. Our effective income tax rate was 18.5% and 25.8% for the nine months ended September 30, 2019 and 2018 , respectively. The decrease from the first nine months of 2018 was primarily due to the beneficial impact of the international tax provisions from U.S. tax reform as a result of administrative guidance issued during the second half of 2018, changes in valuation allowances related to R&D credits and a lower tax impact on unremitted foreign earnings and profits. The total amount of unrecognized tax benefits as of September 30, 2019 was $9.2 million , of which $8.9 million would affect our effective tax rate if recognized. We recognize interest and penalties related to unrecognized tax benefits through income tax expense. As of September 30, 2019 , we had $0.6 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 2014.

Segment Information

Segment Information	9 Months Ended
Segment Information	Sep. 30, 2019
Segment Reporting [Abstract]
Segment Information	Note 15 – Segment Information Our reporting structure is comprised of the following strategic operating segments: ACS, EMS and PES. The remaining operations, which represent 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 Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers . For additional information regarding the impacts of this accounting guidance, refer to “ Note 16 – Revenue from Contracts with Customers .” We sell products to fabricators and distributors who then sell directly into various end markets. End markets within our ACS operating segment include wireless infrastructure, aerospace and defense, automotive, connected devices, wired infrastructure and consumer electronics. End markets within our EMS operating segment include portable electronics, mass transit, automotive, consumer and general industrial. End markets within our PES operating segment include e-mobility, industrial, renewable energy, mass transit, and micro channel coolers. End markets in our Other operating segment include automotive and industrial. The following table presents a disaggregation of revenue from contracts with customers and other pertinent financial information, 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 September 30, 2019 Net sales - recognized over time $ — $ 3,429 $ 42,906 $ 4,504 $ 50,839 Net sales - recognized at a point in time 78,983 91,511 225 284 171,003 Total net sales $ 78,983 $ 94,940 $ 43,131 $ 4,788 $ 221,842 Operating income $ 13,778 $ 17,995 $ (3,358 ) $ 1,470 $ 29,885 Three Months Ended September 30, 2018 Net sales - recognized over time $ — $ 1,790 $ 54,797 $ 3,067 $ 59,654 Net sales - recognized at a point in time 71,854 93,998 425 932 167,209 Total net sales $ 71,854 $ 95,788 $ 55,222 $ 3,999 $ 226,863 Operating income $ 8,451 $ 15,924 $ 4,067 $ 1,200 $ 29,642 Nine Months Ended September 30, 2019 Net sales - recognized over time $ — $ 9,400 $ 153,827 $ 13,421 $ 176,648 Net sales - recognized at a point in time 251,982 272,196 780 2,886 527,844 Total net sales $ 251,982 $ 281,596 $ 154,607 $ 16,307 $ 704,492 Operating income $ 45,301 $ 46,752 $ (976 ) $ 4,821 $ 95,898 Nine Months Ended September 30, 2018 Net sales - recognized over time $ — $ 3,731 $ 165,248 $ 12,332 $ 181,311 Net sales - recognized at a point in time 221,685 249,356 1,334 2,463 474,838 Total net sales $ 221,685 $ 253,087 $ 166,582 $ 14,795 $ 656,149 Operating income $ 26,946 $ 38,505 $ 15,328 $ 5,131 $ 85,910 Information relating to our segment operations by geographic area for the three months ended September 30, 2019 and 2018 was as follows: (Dollars in thousands) Net Sales (1) Region/Country Advanced Connectivity Solutions Elastomeric Material Solutions Power Electronics Solutions Other Total September 30, 2019 United States $ 17,671 $ 41,232 $ 8,115 $ 1,237 $ 68,255 Other Americas 807 2,452 11 271 3,541 Total Americas 18,478 43,684 8,126 1,508 71,796 China 37,398 26,461 7,642 908 72,409 Other APAC 13,813 14,385 6,269 675 35,142 Total APAC 51,211 40,846 13,911 1,583 107,551 Germany 4,251 3,868 10,528 171 18,818 Other EMEA 5,043 6,542 10,566 1,526 23,677 Total EMEA 9,294 10,410 21,094 1,697 42,495 Total net sales $ 78,983 $ 94,940 $ 43,131 $ 4,788 $ 221,842 September 30, 2018 United States $ 12,889 $ 37,691 $ 10,738 $ 1,029 $ 62,347 Other Americas 674 8,196 145 138 9,153 Total Americas 13,563 45,887 10,883 1,167 71,500 China 34,798 30,849 10,432 811 76,890 Other APAC 14,962 11,807 6,348 666 33,783 Total APAC 49,760 42,656 16,780 1,477 110,673 Germany 3,515 2,019 15,464 159 21,157 Other EMEA 5,016 5,226 12,095 1,196 23,533 Total EMEA 8,531 7,245 27,559 1,355 44,690 Total net sales $ 71,854 $ 95,788 $ 55,222 $ 3,999 $ 226,863 (1) Net sales are allocated to countries based on the location of the customer. The table above lists individual countries with 10% or more of net sales for the periods indicated. Information relating to our segment operations by geographic area for the nine months ended September 30, 2019 and 2018 was as follows: (Dollars in thousands) Net Sales (1) Region/Country Advanced Connectivity Solutions Elastomeric Material Solutions Power Electronics Solutions Other Total September 30, 2019 United States $ 47,014 $ 126,067 $ 23,800 $ 3,606 $ 200,487 Other Americas 2,598 6,725 260 668 10,251 Total Americas 49,612 132,792 24,060 4,274 210,738 China 129,220 72,726 29,989 4,374 236,309 Other APAC 44,980 44,407 18,232 2,244 109,863 Total APAC 174,200 117,133 48,221 6,618 346,172 Germany 12,674 10,775 46,780 447 70,676 Other EMEA 15,496 20,896 35,546 4,968 76,906 Total EMEA 28,170 31,671 82,326 5,415 147,582 Total net sales $ 251,982 $ 281,596 $ 154,607 $ 16,307 $ 704,492 September 30, 2018 United States $ 39,615 $ 111,160 $ 27,595 $ 3,151 $ 181,521 Other Americas 2,257 12,176 826 694 15,953 Total Americas 41,872 123,336 28,421 3,845 197,474 China 100,337 75,714 28,794 3,539 208,384 Other APAC 48,888 29,291 19,891 2,108 100,178 Total APAC 149,225 105,005 48,685 5,647 308,562 Germany 14,588 7,356 46,697 491 69,132 Other EMEA 16,000 17,390 42,779 4,812 80,981 Total EMEA 30,588 24,746 89,476 5,303 150,113 Total net sales $ 221,685 $ 253,087 $ 166,582 $ 14,795 $ 656,149 (1) Net sales are allocated to countries based on the location of the customer. The table above lists individual countries with 10% or more of net sales for the periods indicated.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	9 Months Ended
Revenue from Contracts with Customers	Sep. 30, 2019
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer	Note 16 – Revenue from Contracts with Customers 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 September 30, 2019 or December 31, 2018 . The following table presents contract assets by operating segment as of September 30, 2019 and December 31, 2018 : (Dollars in thousands) September 30, 2019 December 31, 2018 Advanced Connectivity Solutions $ — $ — Elastomeric Material Solutions 1,347 943 Power Electronics Solutions 20,965 19,738 Other 1,758 2,047 Total contract assets $ 24,070 $ 22,728 No impairment losses were recognized for each of the three- and nine-month periods ended September 30, 2019 and 2018 on any receivables or contract assets arising from our contracts with customers.

Restructuring and Impairment Ch

Restructuring and Impairment Charges	9 Months Ended
Restructuring and Impairment Charges	Sep. 30, 2019
Restructuring and Related Activities [Abstract]
Restructuring and Impairment Charges	Note 17 – Restructuring and Impairment Charges In 2018, we made the decision to consolidate our Santa Fe Springs, California operations into the Company’s facilities in Carol Stream, Illinois and Bear, Delaware. We recorded no expense for the three months ended September 30, 2019 , and $0.9 million of expense for the nine months ended September 30, 2019 , related to the facility consolidation. We recorded $0.5 million and $1.0 million of expense related to this project in the three and nine months ended September 30, 2018 , respectively. The fair value of the total severance benefits paid in connection with the facility consolidation was $0.5 million . The total severance costs were expensed ratably over the required service period for the affected employees. All severance expenses were recorded as of December 31, 2018, and the final severance payments were made in the first quarter of 2019. The following table presents severance activity related to the facility consolidation for the nine months ended September 30, 2019 : (Dollars in thousands) Severance Related to Facility Consolidation Balance as of December 31, 2018 $ 523 Provisions — Payments (523 ) Balance as of September 30, 2019 $ — We recognized $0.6 million and $1.5 million in impairment charges for the three and nine months ended September 30, 2019 , respectively, primarily related to certain assets in connection with the Isola USA Corp. (Isola) asset acquisition.

Supplemental Financial Informat

Supplemental Financial Information	9 Months Ended
Supplemental Financial Information	Sep. 30, 2019
Supplemental Income Statement Elements [Abstract]
Supplemental Financial Information	Note 18 – Supplemental Financial Information The components of “Other operating (income) expense, net” are as follows: Three Months Ended Nine Months Ended (Dollars in thousands) September 30, 2019 September 30, 2018 September 30, 2019 September 30, 2018 Gain from antitrust litigation settlement $ — $ — $ — $ (3,591 ) Loss (gain) on sale of property, plant and equipment 2 222 278 (161 ) Lease income (57 ) (237 ) (932 ) (237 ) Depreciation on leased assets 179 878 1,729 878 Total other operating (income) expense, net $ 124 $ 863 $ 1,075 $ (3,111 ) 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. With respect to other operating (income) expense, net, in connection with the transitional leaseback of a portion of the facility and certain machinery and equipment acquired from Isola in August 2018. We recognized lease income and related depreciation on leased assets of approximately $0.1 million and $0.2 million , respectively, in the three months ended September 30, 2019 , and approximately $0.2 million and $0.9 million , respectively, in the three months ended September 30, 2018 . We recognized lease income and related depreciation on leased assets of approximately $0.9 million and $1.7 million , respectively, in the nine months ended September 30, 2019 , and approximately $0.2 million and $0.9 million , respectively, in the nine months ended September 30, 2018 .

Recent Accounting Standards

Recent Accounting Standards	9 Months Ended
Recent Accounting Standards	Sep. 30, 2019
Accounting Policies [Abstract]
Recent Accounting Standards	Note 19 – Recent Accounting Standards Recently Issued Standards In August 2018, the Financial Accounting Standards Board (FASB) issued ASU 2018-14, Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans , which modifies the disclosure requirements for employers that sponsor defined benefit plans or other postretirement plans. This ASU is effective for our fiscal year ending December 31, 2020, with early adoption permitted. ASU 2018-14 is required to be applied on a retrospective basis to all periods presented. The Company is currently evaluating the potential impact of adopting this guidance on our consolidated financial statements. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement . This ASU modifies the disclosure requirements for fair value measurements by removing the requirement to disclose the amount and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy and the policy for timing of such transfers. This ASU expands the disclosure requirements for Level 3 fair value measurements, primarily focused on changes in unrealized gains and losses included in other comprehensive income (loss). This ASU is effective for our fiscal year ending December 31, 2020 and for the interim periods within that year. Early adoption is permitted. ASU 2018-13 is generally required to be applied retrospectively to all periods presented upon their effective date with the exception of certain amendments, that should be applied prospectively to the most recent interim or annual period presented in the year of adoption. The Company is currently evaluating the potential impact of adopting this guidance on our consolidated financial statements. Recently Adopted Standards Reflected in Our 2019 Financial Statements In October 2018, the FASB issued ASU 2018-16, Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes , which permits the use of the OIS rate based on the SOFR as a U.S. benchmark interest rate for hedge accounting purposes. The amendments in this update were effective for the Company on January 1, 2019 and the Company will apply the amendments in this update to qualifying new or redesignated hedging relationships. In August 2018, the FASB issued ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract , which aligns the requirements for capitalizing costs incurred in the implementation of a hosting arrangement that is a service contract with the requirements for capitalizing costs incurred to develop or obtain internal use software. The Company adopted this ASU on January 1, 2019 on a prospective basis and it did not have a material impact on our condensed consolidated financial statements. In February 2018, the FASB issued ASU 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 U.S. Tax Reform from accumulated other comprehensive loss to retained earnings but it does not require this reclassification. The Company adopted this ASU on January 1, 2019 and elected to not reclassify the stranded tax effects resulting from U.S. Tax Reform. As a result of that election, the adoption of ASU 2018-02 did not have an impact on the Company’s consolidated financial statements and disclosures. In February 2016, the FASB issued ASU 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 2016-02 supersedes the existing guidance on accounting for leases. In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842): Targeted Improvements , which allowed for an optional transition method for the adoption of Topic 842. The two permitted transition methods are now the modified retrospective approach, which applies the new lease requirements at the beginning of the earliest period presented, and the optional transition method, which applies the new lease requirements through a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Company adopted this standard on January 1, 2019 using the optional transition method. The Company elected to use the practical expedients that allow us to carry forward the historical lease classification. For additional information regarding the impact of the adoption of this standard, refer to “ Note 11 - Leases .”

Share Repurchases

Share Repurchases	9 Months Ended
Share Repurchases	Sep. 30, 2019
Equity [Abstract]
Share Repurchases	Note 20 – Share Repurchases In 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 potentially dilutive effects of stock options and shares of restricted stock 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. No share repurchases were made during the three and nine months ended September 30, 2019 and during the three months ended September 30, 2018 . During the nine months ended September 30, 2018 , we repurchased 23,138 shares of our capital stock for $3.0 million . As of September 30, 2019 , $49.0 million remained of our $100.0 million share repurchase program.

Recent Accounting Standards (Po

Recent Accounting Standards (Policies)	9 Months Ended
Recent Accounting Standards (Policies)	Sep. 30, 2019
Accounting Policies [Abstract]
Recently Issued Standards and Recently Adopted Standards Reflected in Our 2019 Financial Statements	Recently Issued Standards In August 2018, the Financial Accounting Standards Board (FASB) issued ASU 2018-14, Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans , which modifies the disclosure requirements for employers that sponsor defined benefit plans or other postretirement plans. This ASU is effective for our fiscal year ending December 31, 2020, with early adoption permitted. ASU 2018-14 is required to be applied on a retrospective basis to all periods presented. The Company is currently evaluating the potential impact of adopting this guidance on our consolidated financial statements. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement . This ASU modifies the disclosure requirements for fair value measurements by removing the requirement to disclose the amount and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy and the policy for timing of such transfers. This ASU expands the disclosure requirements for Level 3 fair value measurements, primarily focused on changes in unrealized gains and losses included in other comprehensive income (loss). This ASU is effective for our fiscal year ending December 31, 2020 and for the interim periods within that year. Early adoption is permitted. ASU 2018-13 is generally required to be applied retrospectively to all periods presented upon their effective date with the exception of certain amendments, that should be applied prospectively to the most recent interim or annual period presented in the year of adoption. The Company is currently evaluating the potential impact of adopting this guidance on our consolidated financial statements. Recently Adopted Standards Reflected in Our 2019 Financial Statements In October 2018, the FASB issued ASU 2018-16, Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes , which permits the use of the OIS rate based on the SOFR as a U.S. benchmark interest rate for hedge accounting purposes. The amendments in this update were effective for the Company on January 1, 2019 and the Company will apply the amendments in this update to qualifying new or redesignated hedging relationships. In August 2018, the FASB issued ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract , which aligns the requirements for capitalizing costs incurred in the implementation of a hosting arrangement that is a service contract with the requirements for capitalizing costs incurred to develop or obtain internal use software. The Company adopted this ASU on January 1, 2019 on a prospective basis and it did not have a material impact on our condensed consolidated financial statements. In February 2018, the FASB issued ASU 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 U.S. Tax Reform from accumulated other comprehensive loss to retained earnings but it does not require this reclassification. The Company adopted this ASU on January 1, 2019 and elected to not reclassify the stranded tax effects resulting from U.S. Tax Reform. As a result of that election, the adoption of ASU 2018-02 did not have an impact on the Company’s consolidated financial statements and disclosures. In February 2016, the FASB issued ASU 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 2016-02 supersedes the existing guidance on accounting for leases. In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842): Targeted Improvements , which allowed for an optional transition method for the adoption of Topic 842. The two permitted transition methods are now the modified retrospective approach, which applies the new lease requirements at the beginning of the earliest period presented, and the optional transition method, which applies the new lease requirements through a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Company adopted this standard on January 1, 2019 using the optional transition method. The Company elected to use the practical expedients that allow us to carry forward the historical lease classification. For additional information regarding the impact of the adoption of this standard, refer to “ Note 11 - Leases .”

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
Fair Value Measurements (Tables)	Sep. 30, 2019
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, include: Derivative Instruments at Fair Value as of September 30, 2019 (Dollars in thousands) Level 1 Level 2 Level 3 Total Foreign currency contracts $ — $ 189 $ — $ 189 Copper derivative contracts $ — $ 518 $ — $ 518 Interest rate swap $ — $ (1,524 ) $ — $ (1,524 ) Derivative Instruments at Fair Value as of December 31, 2018 (Dollars in thousands) Level 1 Level 2 Level 3 Total Foreign currency contracts $ — $ 522 $ — $ 522 Copper derivative contracts $ — $ 583 $ — $ 583 Interest rate swap $ — $ 461 $ — $ 461

Hedging Transactions and Deri_2

Hedging Transactions and Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Notional Amounts of Outstanding Derivative Positions	As of September 30, 2019 , the notional values of the remaining foreign currency forward contracts were: Notional Values of Foreign Currency Derivatives USD/CNY $ 6,506,000 KRW/USD ₩ 5,979,000,000 September 30, 2019 , the volume of our copper contracts outstanding was as follows: Volume of Copper Derivatives October 2019 - December 2019 195 metric tons per month January 2020 - March 2020 202 metric tons per month April 2020 - June 2020 202 metric tons per month July 2020 - September 2020 201 metric tons per month October 2020 - December 2020 201 metric tons per month
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance	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. This transaction has been designated as a cash flow hedge and qualifies for hedge accounting treatment. For additional information regarding our revolving credit facility, refer to “ Note 10 – Debt .” Effects on Financial Statements (Dollars in thousands) The Effect of Current Derivative Instruments on the Financial Statements for the Period Ended September 30, 2019 Fair Values of Derivative Instruments as of September 30, 2019 Gain (Loss) Other Assets/ (Other Liabilities) (1) Location Three Months Ended Nine Months Ended Foreign Currency Contracts Contracts not designated as hedging instruments Other income (expense), net $ 181 $ (406 ) $ 189 Copper Derivative Contracts Contracts not designated as hedging instruments Other income (expense), net $ (543 ) $ (1,008 ) $ 518 Interest Rate Swap Contract designated as hedging instrument Other comprehensive income (loss) $ (240 ) $ (1,985 ) $ (1,524 ) (Dollars in thousands) The Effect of Current Derivative Instruments on the Financial Statements for the Period Ended September 30, 2018 Fair Values of Derivative Instruments as of September 30, 2018 Gain (Loss) Other Assets/(Other Liabilities) (1) Location Three Months Ended Nine Months Ended Foreign Currency Contracts Contracts not designated as hedging instruments Other income (expense), net $ 29 $ (95 ) $ 342 Copper Derivative Contracts Contracts not designated as hedging instruments Other income (expense), net $ (453 ) $ (1,637 ) $ 631 Interest Rate Swap Contract designated as hedging instrument Other comprehensive income (loss) $ 270 $ 1,669 $ 1,710 (1) All balances were recorded in the “Other current assets” or “Other accrued liabilities” line items in the consolidated statements of financial position, except the 2019 interest rate swap balance, which was recorded in the “Other long-term liabilities” line item in the condensed consolidated statements of financial position.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
Accumulated Other Comprehensive Loss (Tables)	Sep. 30, 2019
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 nine months ended September 30, 2019 and 2018 were as follows: (Dollars and accompanying footnotes in thousands) Foreign Currency Translation Adjustments Pension and Other Postretirement Benefits (1) Derivative Instrument Designated as Cash Flow Hedge (2) Total Balance as of December 31, 2018 $ (30,488 ) $ (48,700 ) $ 354 $ (78,834 ) Other comprehensive income (loss) before reclassifications (12,262 ) — (1,362 ) (13,624 ) Amounts reclassified from accumulated other comprehensive loss — 485 (188 ) 297 Net current-period other comprehensive income (loss) (12,262 ) 485 (1,550 ) (13,327 ) Balance as of September 30, 2019 $ (42,750 ) $ (48,215 ) $ (1,196 ) $ (92,161 ) Balance as of December 31, 2017 $ (17,983 ) $ (47,198 ) $ 26 $ (65,155 ) Other comprehensive income (loss) before reclassifications (9,901 ) — 1,416 (8,485 ) Amounts reclassified from accumulated other comprehensive loss — 131 (108 ) 23 Net current-period other comprehensive income (loss) (9,901 ) 131 1,308 (8,462 ) Balance as of September 30, 2018 $ (27,884 ) $ (47,067 ) $ 1,334 $ (73,617 ) (1) Net of tax benefits of $9,851 and $9,984 as of September 30, 2019 and December 31, 2018 , respectively. Net of tax benefits of $9,523 and $9,563 as of September 30, 2018 and December 31, 2017 , respectively. (2) Net of tax benefits (expenses) of $329 and ($106) as of September 30, 2019 and December 31, 2018 , respectively. Net of tax expenses of ($375) and ($15) as of September 30, 2018 and December 31, 2017 , respectively.

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
Acquisitions (Tables)	Sep. 30, 2019
Business Combinations [Abstract]
Business acquisition, pro forma information	The following unaudited pro forma financial information presents the combined results of operations of Rogers and Griswold as if the Griswold acquisition had occurred on January 1, 2017. The unaudited pro forma financial information is not intended to represent or be indicative of our consolidated results of operations that would have been reported had the Griswold acquisition been completed as of January 1, 2017, and should not be taken as indicative of our future consolidated results of operations. Three Months Ended Nine Months Ended (Dollars in thousands) September 30, 2018 September 30, 2018 Net sales $ 226,863 $ 670,936 Net income 20,765 63,201

Inventories (Tables)

Inventories (Tables)	9 Months Ended
Inventories (Tables)	Sep. 30, 2019
Inventory Disclosure [Abstract]
Inventories	Inventories consisted of the following: (Dollars in thousands) September 30, 2019 December 31, 2018 Raw materials $ 67,150 $ 59,321 Work-in-process 32,247 30,086 Finished goods 38,511 43,230 Total inventories $ 137,908 $ 132,637

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
Goodwill and Other Intangible Assets (Tables)	Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The changes in the carrying amount of goodwill from December 31, 2018 to September 30, 2019 by operating segment, were as follows: (Dollars in thousands) Advanced Connectivity Solutions Elastomeric Material Solutions Power Electronics Solutions Other Total December 31, 2018 $ 51,693 $ 142,589 $ 68,379 $ 2,224 $ 264,885 Foreign currency translation adjustment — (1,073 ) (3,260 ) — (4,333 ) September 30, 2019 $ 51,693 $ 141,516 $ 65,119 $ 2,224 $ 260,552
Schedule of Intangible Assets	The gross carrying amount, accumulated amortization and net carrying amount of other intangible assets as of September 30, 2019 and December 31, 2018 by classification type, were as follows: September 30, 2019 December 31, 2018 (Dollars in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer relationships $ 148,800 $ 36,413 $ 112,387 $ 149,753 $ 30,078 $ 119,675 Technology 80,163 42,736 37,427 81,535 38,624 42,911 Trademarks and trade names 11,970 4,053 7,917 12,019 3,213 8,806 Covenants not to compete 1,340 441 899 1,340 249 1,091 Total definite-lived other intangible assets 242,273 83,643 158,630 244,647 72,164 172,483 Indefinite-lived other intangible asset 4,309 — 4,309 4,525 — 4,525 Total other intangible assets $ 246,582 $ 83,643 $ 162,939 $ 249,172 $ 72,164 $ 177,008
Schedule of Weighted Average Amortization Period, by Intangible Asset Class	The weighted average amortization period as of September 30, 2019 , 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 7.4 years Technology 4.2 years Trademarks and trade names 4.9 years Covenants not to compete 1.7 years Total definite-lived other intangible assets 6.4 years

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
Earnings Per Share (Tables)	Sep. 30, 2019
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: (In thousands, except per share amounts) Three Months Ended Nine Months Ended September 30, 2019 September 30, 2018 September 30, 2019 September 30, 2018 Numerator: Net income $ 23,387 $ 19,734 $ 76,079 $ 63,199 Denominator: Weighted-average shares outstanding - basic 18,581 18,403 18,569 18,360 Effect of dilutive shares 143 275 146 289 Weighted-average shares outstanding - diluted 18,724 18,678 18,715 18,649 Basic earnings per share $ 1.26 $ 1.07 $ 4.10 $ 3.44 Diluted earnings per share $ 1.25 $ 1.06 $ 4.07 $ 3.39

Capital Stock and Equity Comp_2

Capital Stock and Equity Compensation (Tables)	9 Months Ended
Capital Stock and Equity Compensation (Tables)	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Assumptions Used in Calculation of Fair Value	Below are the assumptions used in the Monte Carlo calculation on the respective grant dates for awards granted in 2019 and 2018: June 3, 2019 February 7, 2019 September 17, 2018 February 8, 2018 Expected volatility 39.7% 36.7% 36.6% 34.8% Expected term (in years) 2.6 2.9 3.0 3.0 Risk-free interest rate 1.78% 2.43% 2.85% 2.28%
Summary of Activity Under Stock Option Plans	A summary of the activity under our stock option plans for the nine months ended September 30, 2019 is presented below: Options Outstanding Weighted- Average Exercise Price Per Share Weighted-Average Remaining Contractual Life in Years Aggregate Intrinsic Value Options outstanding, vested and exercisable as of December 31, 2018 10,950 $ 31.99 2.0 $ 734,469 Options exercised (10,650 ) $ 32.21 Options expired (300 ) $ 23.86 Options outstanding, vested and exercisable as of September 30, 2019 — $ — 0.0 $ —
Performance-Based Restricted 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 performance-based restricted stock units outstanding for the nine months ended September 30, 2019 : Performance-Based Awards outstanding as of December 31, 2018 142,434 Awards granted 112,160 Stock issued (131,650 ) Awards forfeited (11,549 ) Awards outstanding as of September 30, 2019 111,395
Time-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Activities	A summary of activity of the outstanding time-based restricted stock units for the nine months ended September 30, 2019 is presented below: Time-Based Awards outstanding as of December 31, 2018 117,476 Awards granted 61,455 Stock issued (65,887 ) Awards forfeited (7,815 ) Awards outstanding as of September 30, 2019 105,229
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 nine months ended September 30, 2019 : Deferred Stock Units Awards outstanding as of December 31, 2018 8,400 Awards granted 5,950 Stock issued (7,200 ) Awards outstanding as of September 30, 2019 7,150

Leases (Tables)

Leases (Tables)	9 Months Ended
Leases (Tables)	Sep. 30, 2019
Leases [Abstract]
Lease, Cost	The following table includes information regarding the lease term and discount rates utilized in the calculation of the present value of net future minimum lease payments: Finance Leases Operating Leases Weighted Average Remaining Lease Term 2.0 years 2.6 years Weighted Average Discount Rate 3.00% 6.08% The following table includes our expenses and payments for operating leases for the three and nine months ended September 30, 2019 : (Dollars in thousands) Three Months Ended Nine Months Ended September 30, 2019 September 30, 2019 Operating leases expense 843 2,336 Short-term leases expense 68 150 Payments on operating lease obligations 719 2,243
Assets and Liabilities Balance Related to Finance and Operating Leases	As of September 30, 2019 and December 31, 2018 , our assets and liabilities balances related to finance and operating leases were as follows: (Dollars in thousands) Location in Statements of Financial Position September 30, 2019 December 31, 2018 Finance lease right-of-use assets Property, plant and equipment, net $ 6,186 $ 6,750 Operating lease right-of-use assets Other long-term assets $ 5,461 $ — Finance lease obligations, current portion Other accrued liabilities $ 404 $ 420 Finance lease obligations, non-current portion Other long-term liabilities $ 4,119 $ 4,629 Total finance lease obligations $ 4,523 $ 5,049 Operating lease obligations, current portion Other accrued liabilities $ 2,449 $ — Operating lease obligations, non-current portion Other long-term liabilities $ 3,031 $ — Total operating lease obligations $ 5,480 $ —
Finance Lease, Liability, Maturity	The following table includes future minimum lease payments under finance and operating leases together with the present value of the net future minimum lease payments as of September 30, 2019 : (Dollars in thousands) Finance Operating Leases Leases Signed Less: Leases Not Yet Commenced Leases 2019 $ 143 $ 696 $ — $ 696 2020 500 2,630 — 2,630 2021 4,072 1,546 — 1,546 2022 — 802 — 802 2023 — 229 — 229 Thereafter — 31 — 31 Total Lease Payments 4,715 5,934 — 5,934 Less: Interest (192 ) (454 ) — (454 ) Present Value of Net Future Minimum Lease Payments $ 4,523 $ 5,480 $ — $ 5,480
Operating Lease, Liability, Maturity	The following table includes future minimum lease payments under finance and operating leases together with the present value of the net future minimum lease payments as of September 30, 2019 : (Dollars in thousands) Finance Operating Leases Leases Signed Less: Leases Not Yet Commenced Leases 2019 $ 143 $ 696 $ — $ 696 2020 500 2,630 — 2,630 2021 4,072 1,546 — 1,546 2022 — 802 — 802 2023 — 229 — 229 Thereafter — 31 — 31 Total Lease Payments 4,715 5,934 — 5,934 Less: Interest (192 ) (454 ) — (454 ) Present Value of Net Future Minimum Lease Payments $ 4,523 $ 5,480 $ — $ 5,480

Pension Benefits and Other Po_2

Pension Benefits and Other Postretirement Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2019
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 Nine Months Ended Three Months Ended Nine Months Ended September 30, September 30, September 30, September 30, 2019 2018 2019 2018 2019 2018 2019 2018 Service cost $ — $ — $ — $ — $ 12 $ 17 $ 48 $ 55 Interest cost 1,790 1,692 5,359 5,064 14 16 44 47 Expected return of plan assets (2,187 ) (2,164 ) (6,571 ) (6,497 ) — — — — Amortization of prior service credit — — — — (252 ) (400 ) (758 ) (1,201 ) Amortization of net loss 476 457 1,386 1,370 — — — — Net periodic cost (benefit) $ 79 $ (15 ) $ 174 $ (63 ) $ (226 ) $ (367 ) $ (666 ) $ (1,099 )

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
Commitments and Contingencies (Tables)	Sep. 30, 2019
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 nine months ended September 30, 2019 : Asbestos Claims Claims outstanding as of December 31, 2018 745 New claims filed 228 Pending claims concluded (1) (147 ) Claims outstanding as of September 30, 2019 826 (1) For the nine months ended September 30, 2019 , 123 claims were dismissed and 24 claims were settled. Settlements totaled approximately $2.2 million for the nine months ended September 30, 2019 .
Schedule of Asbestos-Related Claims and Insurance Receivables	As of September 30, 2019 and December 31, 2018 , our projected asbestos-related claims and insurance receivables were as follows: (Dollars in millions) September 30, 2019 December 31, 2018 Asbestos-related claims $ 70.7 $ 70.3 Asbestos-related insurance receivables $ 64.4 $ 63.8

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
Segment Information (Tables)	Sep. 30, 2019
Segment Reporting [Abstract]
Reportable Segment Information	The following table presents a disaggregation of revenue from contracts with customers and other pertinent financial information, 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 September 30, 2019 Net sales - recognized over time $ — $ 3,429 $ 42,906 $ 4,504 $ 50,839 Net sales - recognized at a point in time 78,983 91,511 225 284 171,003 Total net sales $ 78,983 $ 94,940 $ 43,131 $ 4,788 $ 221,842 Operating income $ 13,778 $ 17,995 $ (3,358 ) $ 1,470 $ 29,885 Three Months Ended September 30, 2018 Net sales - recognized over time $ — $ 1,790 $ 54,797 $ 3,067 $ 59,654 Net sales - recognized at a point in time 71,854 93,998 425 932 167,209 Total net sales $ 71,854 $ 95,788 $ 55,222 $ 3,999 $ 226,863 Operating income $ 8,451 $ 15,924 $ 4,067 $ 1,200 $ 29,642 Nine Months Ended September 30, 2019 Net sales - recognized over time $ — $ 9,400 $ 153,827 $ 13,421 $ 176,648 Net sales - recognized at a point in time 251,982 272,196 780 2,886 527,844 Total net sales $ 251,982 $ 281,596 $ 154,607 $ 16,307 $ 704,492 Operating income $ 45,301 $ 46,752 $ (976 ) $ 4,821 $ 95,898 Nine Months Ended September 30, 2018 Net sales - recognized over time $ — $ 3,731 $ 165,248 $ 12,332 $ 181,311 Net sales - recognized at a point in time 221,685 249,356 1,334 2,463 474,838 Total net sales $ 221,685 $ 253,087 $ 166,582 $ 14,795 $ 656,149 Operating income $ 26,946 $ 38,505 $ 15,328 $ 5,131 $ 85,910 Information relating to our segment operations by geographic area for the three months ended September 30, 2019 and 2018 was as follows: (Dollars in thousands) Net Sales (1) Region/Country Advanced Connectivity Solutions Elastomeric Material Solutions Power Electronics Solutions Other Total September 30, 2019 United States $ 17,671 $ 41,232 $ 8,115 $ 1,237 $ 68,255 Other Americas 807 2,452 11 271 3,541 Total Americas 18,478 43,684 8,126 1,508 71,796 China 37,398 26,461 7,642 908 72,409 Other APAC 13,813 14,385 6,269 675 35,142 Total APAC 51,211 40,846 13,911 1,583 107,551 Germany 4,251 3,868 10,528 171 18,818 Other EMEA 5,043 6,542 10,566 1,526 23,677 Total EMEA 9,294 10,410 21,094 1,697 42,495 Total net sales $ 78,983 $ 94,940 $ 43,131 $ 4,788 $ 221,842 September 30, 2018 United States $ 12,889 $ 37,691 $ 10,738 $ 1,029 $ 62,347 Other Americas 674 8,196 145 138 9,153 Total Americas 13,563 45,887 10,883 1,167 71,500 China 34,798 30,849 10,432 811 76,890 Other APAC 14,962 11,807 6,348 666 33,783 Total APAC 49,760 42,656 16,780 1,477 110,673 Germany 3,515 2,019 15,464 159 21,157 Other EMEA 5,016 5,226 12,095 1,196 23,533 Total EMEA 8,531 7,245 27,559 1,355 44,690 Total net sales $ 71,854 $ 95,788 $ 55,222 $ 3,999 $ 226,863 (1) Net sales are allocated to countries based on the location of the customer. The table above lists individual countries with 10% or more of net sales for the periods indicated. Information relating to our segment operations by geographic area for the nine months ended September 30, 2019 and 2018 was as follows: (Dollars in thousands) Net Sales (1) Region/Country Advanced Connectivity Solutions Elastomeric Material Solutions Power Electronics Solutions Other Total September 30, 2019 United States $ 47,014 $ 126,067 $ 23,800 $ 3,606 $ 200,487 Other Americas 2,598 6,725 260 668 10,251 Total Americas 49,612 132,792 24,060 4,274 210,738 China 129,220 72,726 29,989 4,374 236,309 Other APAC 44,980 44,407 18,232 2,244 109,863 Total APAC 174,200 117,133 48,221 6,618 346,172 Germany 12,674 10,775 46,780 447 70,676 Other EMEA 15,496 20,896 35,546 4,968 76,906 Total EMEA 28,170 31,671 82,326 5,415 147,582 Total net sales $ 251,982 $ 281,596 $ 154,607 $ 16,307 $ 704,492 September 30, 2018 United States $ 39,615 $ 111,160 $ 27,595 $ 3,151 $ 181,521 Other Americas 2,257 12,176 826 694 15,953 Total Americas 41,872 123,336 28,421 3,845 197,474 China 100,337 75,714 28,794 3,539 208,384 Other APAC 48,888 29,291 19,891 2,108 100,178 Total APAC 149,225 105,005 48,685 5,647 308,562 Germany 14,588 7,356 46,697 491 69,132 Other EMEA 16,000 17,390 42,779 4,812 80,981 Total EMEA 30,588 24,746 89,476 5,303 150,113 Total net sales $ 221,685 $ 253,087 $ 166,582 $ 14,795 $ 656,149 (1) Net sales are allocated to countries based on the location of the customer. The table above lists individual countries with 10% or more of net sales for the periods indicated.

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	9 Months Ended
Revenue from Contracts with Customers (Tables)	Sep. 30, 2019
Revenue from Contract with Customer [Abstract]
Contract Assets by Operating Segment	The following table presents contract assets by operating segment as of September 30, 2019 and December 31, 2018 : (Dollars in thousands) September 30, 2019 December 31, 2018 Advanced Connectivity Solutions $ — $ — Elastomeric Material Solutions 1,347 943 Power Electronics Solutions 20,965 19,738 Other 1,758 2,047 Total contract assets $ 24,070 $ 22,728

Restructuring and Impairment _2

Restructuring and Impairment Charges (Tables)	9 Months Ended
Restructuring and Impairment Charges (Tables)	Sep. 30, 2019
Restructuring and Related Activities [Abstract]
Restructuring and Related Costs	The following table presents severance activity related to the facility consolidation for the nine months ended September 30, 2019 : (Dollars in thousands) Severance Related to Facility Consolidation Balance as of December 31, 2018 $ 523 Provisions — Payments (523 ) Balance as of September 30, 2019 $ —

Supplemental Financial Inform_2

Supplemental Financial Information (Tables)	9 Months Ended
Supplemental Financial Information (Tables)	Sep. 30, 2019
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 Nine Months Ended (Dollars in thousands) September 30, 2019 September 30, 2018 September 30, 2019 September 30, 2018 Gain from antitrust litigation settlement $ — $ — $ — $ (3,591 ) Loss (gain) on sale of property, plant and equipment 2 222 278 (161 ) Lease income (57 ) (237 ) (932 ) (237 ) Depreciation on leased assets 179 878 1,729 878 Total other operating (income) expense, net $ 124 $ 863 $ 1,075 $ (3,111 )

Fair Value Measurements (Variou

Fair Value Measurements (Various Instruments That Require Fair Value Measurement) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Foreign currency contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	$ 189	$ 522
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	189	522
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	518	583
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	518	583
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	(1,524)	461
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	(1,524)	461
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 Deri_3

Hedging Transactions and Derivative Financial Instruments (Additional Information) (Details)	Sep. 30, 2019Contract	Dec. 31, 2017USD ($)	Mar. 31, 2017USD ($)
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 (in contracts) \| Contract	27
Third Amended Credit Agreement \| Revolving Credit Facility
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Maximum borrowing capacity		$ 450,000,000	$ 450,000,000
Interest rate swap \| Third Amended Credit Agreement \| Revolving Credit Facility
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged balance on debt instrument			$ 75,000,000

Hedging Transactions and Deri_4

Hedging Transactions and Derivative Financial Instruments (Notional Values of Derivative Instruments) (Details)	Sep. 30, 2019KRW (₩)T / mo	Sep. 30, 2019USD ($)T / mo
Contracts not designated as hedging instruments \| USD/CNY \| Foreign Currency Derivatives
Derivative [Line Items]
Notional Values of Foreign Currency Derivatives \| $		$ 6,506,000
Contracts not designated as hedging instruments \| KRW/USD \| Foreign Currency Derivatives
Derivative [Line Items]
Notional Values of Foreign Currency Derivatives \| ₩	₩ 5,979,000,000
Contract designated as hedging instrument \| October 2019 - December 2019
Derivative [Line Items]
Volume of Copper Derivatives (in metric tons per month)	195	195
Contract designated as hedging instrument \| January 2020 - March 2020
Derivative [Line Items]
Volume of Copper Derivatives (in metric tons per month)	202	202
Contract designated as hedging instrument \| April 2020 - June 2020
Derivative [Line Items]
Volume of Copper Derivatives (in metric tons per month)	202	202
Contract designated as hedging instrument \| July 2020 - September 2020
Derivative [Line Items]
Volume of Copper Derivatives (in metric tons per month)	201	201
Contract designated as hedging instrument \| October 2020 - December 2020
Derivative [Line Items]
Volume of Copper Derivatives (in metric tons per month)	201	201

Hedging Transactions and Deri_5

Hedging Transactions and Derivative Financial Instruments (Effect and Fair Value of Derivative Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Contracts not designated as hedging instruments \| Other income (expense), net \| Foreign Currency Contracts
Derivative [Line Items]
The Effect of Current Derivative Instruments on the Financial Statements, Gain (Loss)	$ 181	$ 29	$ (406)	$ (95)
Contracts not designated as hedging instruments \| Other income (expense), net \| Copper Derivative Contracts
Derivative [Line Items]
The Effect of Current Derivative Instruments on the Financial Statements, Gain (Loss)	(543)	(453)	(1,008)	(1,637)
Contract designated as hedging instrument \| Other comprehensive income (loss) \| Interest rate swap
Derivative [Line Items]
The Effect of Current Derivative Instruments on the Financial Statements, Gain (Loss)	(240)	270	(1,985)	1,669
Level 2 \| Fair Value, Measurements, Recurring \| Foreign Currency Contracts
Derivative [Line Items]
Fair Value of Derivative Instruments, Other Assets/(Other Liabilities)	189	342	189	342
Level 2 \| Fair Value, Measurements, Recurring \| Copper Derivative Contracts
Derivative [Line Items]
Fair Value of Derivative Instruments, Other Assets/(Other Liabilities)	518	631	518	631
Level 2 \| Fair Value, Measurements, Recurring \| Interest rate swap
Derivative [Line Items]
Fair Value of Derivative Instruments, Other Assets/(Other Liabilities)	$ (1,524)	$ 1,710	$ (1,524)	$ 1,710

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning of period			$ 848,324
Other comprehensive income (loss)	$ (10,205)	$ (1,353)	(13,327)	$ (8,462)
Balance, end of period	914,634	826,383	914,634	826,383
AOCI, pension and other postretirement benefit plans, tax benefits (expense)	9,851	9,523	9,851	9,523	$ 9,984	$ 9,563
AOCI, cumulative changes in net gain (loss) from cash flow hedges, tax benefit (expense)	329	(375)	329	(375)	$ (106)	$ (15)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning of period			(30,488)	(17,983)
Other comprehensive income (loss) before reclassifications			(12,262)	(9,901)
Amounts reclassified from accumulated other comprehensive loss			0	0
Other comprehensive income (loss)			(12,262)	(9,901)
Balance, end of period	(42,750)	(27,884)	(42,750)	(27,884)
Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning of period			(48,700)	(47,198)
Other comprehensive income (loss) before reclassifications			0	0
Amounts reclassified from accumulated other comprehensive loss			485	131
Other comprehensive income (loss)			485	131
Balance, end of period	(48,215)	(47,067)	(48,215)	(47,067)
Derivative Instrument Designated as Cash Flow Hedge
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning of period			354	26
Other comprehensive income (loss) before reclassifications			(1,362)	1,416
Amounts reclassified from accumulated other comprehensive loss			(188)	(108)
Other comprehensive income (loss)			(1,550)	1,308
Balance, end of period	(1,196)	1,334	(1,196)	1,334
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning of period	(81,956)	(72,264)	(78,834)	(65,155)
Other comprehensive income (loss) before reclassifications			(13,624)	(8,485)
Amounts reclassified from accumulated other comprehensive loss			297	23
Other comprehensive income (loss)	(10,205)	(1,353)	(13,327)	(8,462)
Balance, end of period	$ (92,161)	$ (73,617)	$ (92,161)	$ (73,617)

Acquisitions - Additional Infor

Acquisitions - Additional Information (Details) - Griswold $ in Millions	Jul. 06, 2018USD ($)
Business Acquisition [Line Items]
Business acquisition, voting interests acquired (as a percentage)	100.00%
Consideration transferred	$ 78

Acquisitions - Business Acquisi

Acquisitions - Business Acquisition Pro Forma Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Business Combinations [Abstract]
Net sales	$ 226,863	$ 670,936
Net income	$ 20,765	$ 63,201

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Raw materials	$ 67,150	$ 59,321
Work-in-process	32,247	30,086
Finished goods	38,511	43,230
Total inventories	$ 137,908	$ 132,637

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill by Segment (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 264,885
Foreign currency translation adjustment	(4,333)
Goodwill, ending balance	260,552
Advanced Connectivity Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance	51,693
Foreign currency translation adjustment	0
Goodwill, ending balance	51,693
Elastomeric Material Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance	142,589
Foreign currency translation adjustment	(1,073)
Goodwill, ending balance	141,516
Power Electronics Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance	68,379
Foreign currency translation adjustment	(3,260)
Goodwill, ending balance	65,119
Other
Goodwill [Roll Forward]
Goodwill, beginning balance	2,224
Foreign currency translation adjustment	0
Goodwill, ending balance	$ 2,224

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 242,273	$ 244,647
Indefinite-lived other intangible asset	4,309	4,525
Total other intangible assets, gross carrying amount	246,582	249,172
Accumulated Amortization	83,643	72,164
Net Carrying Amount	158,630	172,483
Total other intangible assets, net carrying amount	162,939	177,008
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	148,800	149,753
Accumulated Amortization	36,413	30,078
Net Carrying Amount	112,387	119,675
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	80,163	81,535
Accumulated Amortization	42,736	38,624
Net Carrying Amount	37,427	42,911
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	11,970	12,019
Accumulated Amortization	4,053	3,213
Net Carrying Amount	7,917	8,806
Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,340	1,340
Accumulated Amortization	441	249
Net Carrying Amount	$ 899	$ 1,091

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 4.4	$ 4.4	$ 13.3	$ 12.1
Annual Future Amortization Expense
Anticipated future amortization expense for the remainder of 2019	4.4		4.4
Anticipated future amortization expense for 2020	14.5		14.5
Anticipated future amortization expense for 2021	13.8		13.8
Anticipated future amortization expense for 2022	13.3		13.3
anticipated future amortization expense for 2023	$ 12.7		$ 12.7

Goodwill and Other Intangible_6

Goodwill and Other Intangible Assets - Weighted Average Amortization Period by Intangible Asset Class (Details)	9 Months Ended
	Sep. 30, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period	6 years 4 months 24 days
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period	7 years 4 months 24 days
Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period	4 years 2 months 12 days
Trademarks and trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period	4 years 10 months 24 days
Covenants not to compete
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period	1 year 8 months 12 days

Earnings Per Share (Computation

Earnings Per Share (Computation of Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income	$ 23,387	$ 19,734	$ 76,079	$ 63,199
Denominator:
Weighted-average shares outstanding - basic (in shares)	18,581,000	18,403,000	18,569,000	18,360,000
Effect of dilutive shares (in shares)	143,000	275,000	146,000	289,000
Weighted-average shares outstanding - dilutive (in shares)	18,724,000	18,678,000	18,715,000	18,649,000
Basic earnings per share (in dollars per share)	$ 1.26	$ 1.07	$ 4.10	$ 3.44
Diluted earnings per share (in dollars per share)	$ 1.25	$ 1.06	$ 4.07	$ 3.39
Anti-dilutive shares excluded (in shares)	3,173	37,700

Capital Stock and Equity Comp_3

Capital Stock and Equity Compensation (Additional Information) (Details)	3 Months Ended		9 Months Ended		90 Months Ended
	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)offering_periods	Sep. 30, 2018USD ($)	Sep. 30, 2019shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from the exercise of stock options, net			$ 344,000	$ 734,000
Performance-Based Restricted Stock Units
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	$ 1,500,000	$ 1,300,000	$ 3,500,000	3,100,000
Performance-Based Restricted Stock Units \| 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 Units \| 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%
Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	1,100,000	900,000	$ 0	0
Conversion ratio			1
Time-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 1,500,000	$ 1,400,000	$ 4,400,000	$ 4,200,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, contractual term (years)			10 years
Stock options, number of shares granted in period, gross \| shares					0
Proceeds from the exercise of stock options, net			$ 1,600,000
Options exercised, total intrinsic value			$ 300,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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%

Capital Stock and Equity Comp_4

Capital Stock and Equity Compensation (Monte Carlo Calculation Assumptions) (Details) - Performance-Based Restricted Stock Units	Jun. 03, 2019	Feb. 07, 2019	Sep. 17, 2018	Feb. 08, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility (percent)	39.70%	36.70%	36.60%	34.80%
Expected term (in years)	2 years 7 months 6 days	2 years 10 months 24 days	3 years	3 years
Risk-free interest rate (percent)	1.78%	2.43%	2.85%	2.28%

Capital Stock and Equity Comp_5

Capital Stock and Equity Compensation (Performance Based Restricted Stock Awards) (Details) - Performance-Based Restricted Stock Units	9 Months Ended
	Sep. 30, 2019shares
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)	142,434
Awards granted (shares)	112,160
Stock issued (shares)	(131,650)
Awards forfeited (shares)	(11,549)
Non-vested awards outstanding ending balance (shares)	111,395

Capital Stock and Equity Comp_6

Capital Stock and Equity Compensation (Time Based Restricted Stock Awards) (Details) - Time-Based Restricted Stock Units	9 Months Ended
	Sep. 30, 2019shares
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)	117,476
Awards granted (shares)	61,455
Stock issued (shares)	(65,887)
Awards forfeited (shares)	(7,815)
Non-vested awards outstanding ending balance (shares)	105,229

Capital Stock and Equity Comp_7

Capital Stock and Equity Compensation (Deferred Stock Units) (Details) - Deferred Stock Units	9 Months Ended
	Sep. 30, 2019shares
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)	8,400
Awards granted (shares)	5,950
Stock issued (shares)	(7,200)
Non-vested awards outstanding ending balance (shares)	7,150

Capital Stock and Equity Comp_8

Capital Stock and Equity Compensation (Summary of Activity Under Stock Option Plans) (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2019
Options Outstanding
Options outstanding at beginning of period (shares)	10,950
Options exercised (shares)	(10,650)
Options forfeited (shares)	(300)
Options outstanding, vested and exercisable at end of period (shares)	0	10,950
Weighted- Average Exercise Price Per Share
Options outstanding at beginning of period (in dollars per share)	$ 31.99
Options exercised (in dollars per share)	32.21
Options forfeited (in dollars per share)	23.86
Options outstanding, vested and exercisable at end of period (in dollars per share)	$ 0	$ 31.99
Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Remaining Contractual Term
Weighted-Average Remaining Contractual Life in Year, options outstanding, vested and exercisable	0 days	2 years
Aggregate Intrinsic Value
Aggregate Intrinsic Value, options outstanding, vested and exercisable (amount), beginning of period	$ 734,469
Aggregate Intrinsic Value, options outstanding, vested and exercisable (amount), end of period	$ 734,469	$ 734,469	$ 0

Debt (Additional Information) (

Debt (Additional Information) (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
Debt (Additional Information) (Details) - USD ($)	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Debt Instrument [Line Items]
Interest expense incurred on outstanding debt	$ 1,800,000	$ 1,800,000	$ 6,100,000	$ 3,800,000
Borrowings under revolving credit facility	$ 130,482,000		$ 130,482,000		$ 228,482,000
Debt instrument, leverage ratio, maximum	2.75		2.75
Maximum
Debt Instrument [Line Items]
Dividends			$ 20,000,000
Credit Agreement
Debt Instrument [Line Items]
Variable rate lower range basis spread	37.50%		37.50%
Variable rate higher range basis spread	75.00%		75.00%
Third Amended Credit Agreement
Debt Instrument [Line Items]
Leverage ratio	3.25		3.25
One-time leverage ratio maximum option	3.50		3.50
ICR covenant limit	3		3
Discretionary principal payments on revolving credit facility			$ 98,000,000
Outstanding borrowings	$ 1,300,000		$ 1,300,000
Eurocurrency loans \| Credit Agreement
Debt Instrument [Line Items]
Line of credit, LIBOR rate, minimum spread	137.50%		137.50%
Line of credit, LIBOR rate, maximum spread	175.00%		175.00%
Revolving Credit Facility \| Third Amended Credit Agreement
Debt Instrument [Line Items]
Debt instrument, term						5 years
Maximum borrowing capacity						$ 450,000,000	$ 450,000,000
Additional borrowing capacity						$ 175,000,000
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
Griswold
Debt Instrument [Line Items]
Proceeds from line of credit					82,500,000
Rogers Plan
Debt Instrument [Line Items]
Additional borrowing under line of credit					$ 20,000,000
Federal Funds Rate \| Credit Agreement
Debt Instrument [Line Items]
Basis spread on variable rate			0.50%
London Interbank Offered Rate (LIBOR) \| Third Amended Credit Agreement
Debt Instrument [Line Items]
Basis spread on variable rate			1.375%

Leases (Narrative) (Details)

Leases (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Leases (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Finance lease obligation	$ 4,523	$ 5,049
Finance lease right-of-use assets	6,186	6,750
Operating lease right-of-use assets	5,461	0
Operating lease, liability	5,480	0
Germany
Lessee, Lease, Description [Line Items]
Finance lease obligation	4,500	5,000
Finance lease right-of-use assets	6,200	6,700
Finance lease, right-of-use asset, amortization	3,600	$ 3,500
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets			$ 6,200
Operating lease, liability			$ 6,200
Additional operating lease asset recognized	800
Additional operating lease liability recognized	800
Scenario, Adjustment
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	7,000
Operating lease, liability	$ 7,000

Leases (Lease Expenses) (Detai

Leases (Lease Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Leases (Lease Expenses) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating leases expense	$ 843	$ 2,336
Short-term leases expense	68	150
Payments on operating lease obligations	$ 719	$ 2,243

Leases (Assets and Liabilities

Leases (Assets and Liabilities Balance Related to Finance and Operating Leases) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Finance lease right-of-use assets	$ 6,186	$ 6,750
Operating lease right-of-use assets	5,461	0
Finance lease obligations, current portion	404	420
Finance lease obligations, non-current portion	4,119	4,629
Total finance lease obligations	4,523	5,049
Operating lease obligations, current portion	2,449	0
Operating lease obligations, non-current portion	3,031	0
Total operating lease obligations	$ 5,480	$ 0

Leases (Lease Payments) (Detai

Leases (Lease Payments) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Finance Leases
2019	$ 143
2020	500
2021	4,072
2022	0
2023	0
Thereafter	0
Total Lease Payments	4,715
Less: Interest	(192)
Present Value of Net Future Minimum Lease Payments	4,523	$ 5,049
Operating Leases Signed
2019	696
2020	2,630
2021	1,546
2022	802
2023	229
Thereafter	31
Total Lease Payments	5,934
Less: Interest	(454)
Present Value of Net Future Minimum Lease Payments	5,480
Operating Less: Leases Not Yet Commenced
2019	0
2020	0
2021	0
2022	0
2023	0
Thereafter	0
Total Lease Payments	0
Less: Interest	0
Present Value of Net Future Minimum Lease Payments	0
Operating Leases
2019	696
2020	2,630
2021	1,546
2022	802
2023	229
Thereafter	31
Total Lease Payments	5,934
Less: Interest	(454)
Total operating lease obligations	$ 5,480	$ 0

Leases (Lease Term and Discoun

Leases (Lease Term and Discount Rate) (Details)	Sep. 30, 2019
Leases [Abstract]
Finance leases, weighted average remaining lease term	2 years
Finance leases, weighted average discount rate	3.00%
Operating leases, weighted average remaining lease term	2 years 7 months 6 days
Operating leases, weighted average discount rate	6.08%

Pension Benefits and Other Po_3

Pension Benefits and Other Postretirement Benefit Plans (Additional Information) (Details) $ in Thousands	Oct. 30, 2019USD ($)	Oct. 18, 2019USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2019USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)plan	Sep. 30, 2018USD ($)	Dec. 31, 2018USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of qualified noncontributory defined benefit plans \| plan						2
Pension assets						$ 20,236		$ 19,273
Voluntary contributions						$ 16	$ 25,347
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Voluntary contributions					$ 25,000		$ 25,000
Subsequent Event \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Payment for settlement		$ 124,000
Lump sum distributions	$ 39,000
Forecast \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Payment for settlement				$ 1,000
Minimum \| Forecast \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement charge			$ 52,000
Pension assets			7,000	7,000
Maximum \| Forecast \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement charge			56,000
Pension assets			$ 11,000	$ 11,000

Pension Benefits and Other Po_4

Pension Benefits and Other Postretirement Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Pension Benefits
Change in benefit obligation:
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	1,790	1,692	5,359	5,064
Expected return of plan assets	(2,187)	(2,164)	(6,571)	(6,497)
Amortization of prior service credit	0	0	0	0
Amortization of net loss	476	457	1,386	1,370
Net periodic cost (benefit)	79	(15)	174	(63)
Retirement Health and Life Insurance Benefits
Change in benefit obligation:
Service cost	12	17	48	55
Interest cost	14	16	44	47
Expected return of plan assets	0	0	0	0
Amortization of prior service credit	(252)	(400)	(758)	(1,201)
Amortization of net loss	0	0	0	0
Net periodic cost (benefit)	$ (226)	$ (367)	$ (666)	$ (1,099)

Commitments and Contingencies_2

Commitments and Contingencies (Details) $ in Millions	Sep. 30, 2019USD ($)
Connecticut Voluntary Corrective Action Program
Loss Contingencies [Line Items]
Estimated total cleanup costs, accrual	$ 1.6

Commitments and Contingencies_3

Commitments and Contingencies (Schedule of Loss Contingencies) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019USD ($)claimsclaim
Liability for Asbestos and Environmental Claims [Roll Forward]
Claims outstanding as of December 31, 2018	745
New claims filed	228
Pending claims concluded	(147)
Claims outstanding as of September 30, 2019	826
Number of claims dismissed \| claims	123
Number of claims settled \| claims	24
Settlements \| $	$ 2.2

Commitments and Contingencies_4

Commitments and Contingencies (Schedule of Total Estimated Liability for Asbestos) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Asbestos-related claims	$ 70.7	$ 70.3
Asbestos-related insurance receivables	$ 64.4	$ 63.8

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Effective tax rate (percent)	18.60%	31.00%	18.50%	25.80%
Unrecognized tax benefits	$ 9.2		$ 9.2
Unrecognized tax benefits that would decrease the effective tax rate if recognized	8.9		8.9
Unrecognized tax benefits, penalties accrued	$ 0.6		$ 0.6

Segment Information (Income by

Segment Information (Income by Reportable Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Net sales	$ 221,842	$ 226,863	$ 704,492	$ 656,149
Operating income	29,885	29,642	95,898	85,910
Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	78,983	71,854	251,982	221,685
Operating income	13,778	8,451	45,301	26,946
Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	94,940	95,788	281,596	253,087
Operating income	17,995	15,924	46,752	38,505
Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	43,131	55,222	154,607	166,582
Operating income	(3,358)	4,067	(976)	15,328
Other
Segment Reporting Information [Line Items]
Net sales	4,788	3,999	16,307	14,795
Operating income	1,470	1,200	4,821	5,131
Recognized over time
Segment Reporting Information [Line Items]
Net sales	50,839	59,654	176,648	181,311
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	3,429	1,790	9,400	3,731
Recognized over time \| Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	42,906	54,797	153,827	165,248
Recognized over time \| Other
Segment Reporting Information [Line Items]
Net sales	4,504	3,067	13,421	12,332
Recognized at a point in time
Segment Reporting Information [Line Items]
Net sales	171,003	167,209	527,844	474,838
Recognized at a point in time \| Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	78,983	71,854	251,982	221,685
Recognized at a point in time \| Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	91,511	93,998	272,196	249,356
Recognized at a point in time \| Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	225	425	780	1,334
Recognized at a point in time \| Other
Segment Reporting Information [Line Items]
Net sales	284	932	2,886	2,463
United States
Segment Reporting Information [Line Items]
Net sales	68,255	62,347	200,487	181,521
United States \| Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	17,671	12,889	47,014	39,615
United States \| Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	41,232	37,691	126,067	111,160
United States \| Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	8,115	10,738	23,800	27,595
United States \| Other
Segment Reporting Information [Line Items]
Net sales	1,237	1,029	3,606	3,151
Other Americas
Segment Reporting Information [Line Items]
Net sales	3,541	9,153	10,251	15,953
Other Americas \| Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	807	674	2,598	2,257
Other Americas \| Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	2,452	8,196	6,725	12,176
Other Americas \| Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	11	145	260	826
Other Americas \| Other
Segment Reporting Information [Line Items]
Net sales	271	138	668	694
Total Americas
Segment Reporting Information [Line Items]
Net sales	71,796	71,500	210,738	197,474
Total Americas \| Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	18,478	13,563	49,612	41,872
Total Americas \| Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	43,684	45,887	132,792	123,336
Total Americas \| Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	8,126	10,883	24,060	28,421
Total Americas \| Other
Segment Reporting Information [Line Items]
Net sales	1,508	1,167	4,274	3,845
China
Segment Reporting Information [Line Items]
Net sales	72,409	76,890	236,309	208,384
China \| Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	37,398	34,798	129,220	100,337
China \| Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	26,461	30,849	72,726	75,714
China \| Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	7,642	10,432	29,989	28,794
China \| Other
Segment Reporting Information [Line Items]
Net sales	908	811	4,374	3,539
Other APAC
Segment Reporting Information [Line Items]
Net sales	35,142	33,783	109,863	100,178
Other APAC \| Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	13,813	14,962	44,980	48,888
Other APAC \| Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	14,385	11,807	44,407	29,291
Other APAC \| Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	6,269	6,348	18,232	19,891
Other APAC \| Other
Segment Reporting Information [Line Items]
Net sales	675	666	2,244	2,108
Total APAC
Segment Reporting Information [Line Items]
Net sales	107,551	110,673	346,172	308,562
Total APAC \| Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	51,211	49,760	174,200	149,225
Total APAC \| Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	40,846	42,656	117,133	105,005
Total APAC \| Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	13,911	16,780	48,221	48,685
Total APAC \| Other
Segment Reporting Information [Line Items]
Net sales	1,583	1,477	6,618	5,647
Germany
Segment Reporting Information [Line Items]
Net sales	18,818	21,157	70,676	69,132
Germany \| Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	4,251	3,515	12,674	14,588
Germany \| Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	3,868	2,019	10,775	7,356
Germany \| Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	10,528	15,464	46,780	46,697
Germany \| Other
Segment Reporting Information [Line Items]
Net sales	171	159	447	491
Other EMEA
Segment Reporting Information [Line Items]
Net sales	23,677	23,533	76,906	80,981
Other EMEA \| Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	5,043	5,016	15,496	16,000
Other EMEA \| Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	6,542	5,226	20,896	17,390
Other EMEA \| Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	10,566	12,095	35,546	42,779
Other EMEA \| Other
Segment Reporting Information [Line Items]
Net sales	1,526	1,196	4,968	4,812
Total EMEA
Segment Reporting Information [Line Items]
Net sales	42,495	44,690	147,582	150,113
Total EMEA \| Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	9,294	8,531	28,170	30,588
Total EMEA \| Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	10,410	7,245	31,671	24,746
Total EMEA \| Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	21,094	27,559	82,326	89,476
Total EMEA \| Other
Segment Reporting Information [Line Items]
Net sales	$ 1,697	$ 1,355	$ 5,415	$ 5,303

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total contract assets	$ 24,070	$ 22,728
Advanced Connectivity Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total contract assets	0	0
Elastomeric Material Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total contract assets	1,347	943
Power Electronics Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total contract assets	20,965	19,738
Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total contract assets	$ 1,758	$ 2,047

Restructuring and Impairment _3

Restructuring and Impairment Charges - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]
Impairment charges	$ 600,000		$ 1,537,000	$ 477,000
Facility Consolidation
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0	$ 500,000	900,000	$ 1,000,000
Severance and retention expenses			$ 500,000

Restructuring and Impairment _4

Restructuring and Impairment Charges - Schedule of Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring Reserve [Roll Forward]
Provisions	$ 580	$ 1,052	$ 2,485	$ 2,015
Facility Consolidation
Restructuring Reserve [Roll Forward]
Beginning balance			523
Provisions			0
Payments			(523)
Ending balance	$ 0		$ 0

Supplemental Financial Inform_3

Supplemental Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Supplemental Income Statement Elements [Abstract]
Gain from antitrust litigation settlement	$ 0	$ 0	$ (3,600)	$ 0	$ (3,591)
Loss (gain) on sale of property, plant and equipment	2	222		278	(161)
Lease income	(57)	(237)		(932)	(237)
Depreciation on leased assets	179	878		1,729	878
Total other operating (income) expense, net	$ 124	$ 863		$ 1,075	$ (3,111)

Share Repurchases (Details)

Share Repurchases (Details) - USD ($)	3 Months Ended		9 Months Ended
Share Repurchases (Details) - USD ($)	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2015
Equity [Abstract]
Authorized stock repurchase amount					$ 100,000,000
Shares of capital stock repurchased (in shares)	0	0	0	23,138
Shares repurchased				$ 3,000,000
Remaining authorized stock repurchase amount	$ 49,000,000		$ 49,000,000

Uncategorized Items - rog-20190

Label	Element	Value
Accounting Standards Update 2016-02 [Member] \| Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 0
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	(20,000)
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0
Accounting Standards Update 2014-09 [Member] \| Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 4,212,000