Rogers (ROG) 10-K 18 Feb 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Feb. 04, 2015	Jun. 30, 2014
Document Documentand Entity Information [Abstract]
Entity Registrant Name	ROGERS CORP
Trading Symbol	ROG
Entity Central Index Key	84748
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Amendment Flag	FALSE
Entity Voluntary Filer	No
Entity Current Reporting Status	Yes
Entity Well-known Season Filer	Yes
Entity Common Stock, Shares Outstanding		18,415,753
Entity Public Float			$801,437,215

CONSOLIDATED_STATEMENTS_OF_FIN

CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets
Cash and cash equivalents	$237,375	$191,884
Accounts receivable, less allowance for doubtful accounts of $476 and $1,655	94,876	85,126
Accounts receivable from joint ventures	1,760	1,897
Accounts receivable, other	1,823	2,638
Taxes receivable	606	1,578
Inventories	68,628	66,889
Prepaid income taxes	4,586	5,519
Deferred income taxes	8,527	7,271
Asbestos-related insurance receivables	6,827	7,542
Other current assets	7,046	7,363
Total current assets	432,054	377,707
Property, plant and equipment, net of accumulated depreciation	150,420	146,931
Investments in unconsolidated joint ventures	17,214	18,463
Deferred income taxes	44,853	44,854
Pension asset	403	2,982
Goodwill	98,227	108,671
Other intangible assets	38,340	49,171
Asbestos-related insurance receivables	46,186	49,508
Investments, other	341	507
Other long-term assets	7,079	7,740
Total assets	835,117	806,534
Current liabilities
Accounts payable	20,020	17,534
Accrued employee benefits and compensation	33,983	29,724
Accrued income taxes payable	6,103	4,078
Current portion of lease obligation	747	849
Current portion of long term debt	35,000	17,500
Asbestos-related liabilities	6,827	7,542
Other accrued liabilities	17,765	12,813
Total current liabilities	120,445	90,040
Long term debt	25,000	60,000
Long term lease obligation	6,042	7,170
Pension liability	17,652	5,435
Retiree health care and life insurance benefits	8,768	9,649
Asbestos-related liabilities	49,718	52,205
Non-current income tax	10,544	10,208
Deferred income taxes	14,647	16,077
Other long-term liabilities	338	223
Shareholders’ Equity
Capital Stock - $1 par value; 50,000,000 authorized shares; 18,403,109 and 17,854,506 shares outstanding	18,404	17,855
Additional paid-in capital	137,225	110,577
Retained earnings	491,428	438,545
Accumulated other comprehensive income (loss)	-65,094	-11,450
Total shareholders' equity	581,963	555,527
Total liabilities and shareholders' equity	$835,117	$806,534

CONSOLIDATED_STATEMENTS_OF_FIN1

CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Accounts receivable, less allowance for doubtful accounts	$476	$1,655
Capital Stock, par value (in dollars per share)	$1	$1
Capital Stock, authorized shares	50,000,000	50,000,000
Capital Stock, shares outstanding	18,403,109	17,854,506

CONSOLIDATED_STATEMENT_OF_INCO

CONSOLIDATED STATEMENT OF INCOME (LOSS) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Income Statement [Abstract]
Net sales	$610,911	[1]	$537,482	[1]	$498,761	[1]
Cost of sales	376,972		349,782		340,015
Gross margin	233,939		187,700		158,746
Selling and administrative expenses	125,244		106,398		99,689
Research and development expenses	22,878		21,646		19,311
Restructuring and impairment charges	5,390		10,376		14,082
Operating income (loss)	80,427		49,280		25,664
Equity income in unconsolidated joint ventures	4,123		4,326		4,743
Other income (expense), net	-1,194		-1,240		-208
Realized investment gain (loss):
Increase (decrease) in fair value of investments	0		0		-522
Less: Portion reclassified to/from other comprehensive income	0		0		2,723
Net realized gain (loss)	0		0		-3,245
Interest income (expense), net	-2,946		-3,481		-4,304
Income (loss) before income taxes	80,410		48,885		22,650
Income tax expense (benefit)	27,527		11,226		-46,484
Income (loss) from continuing operations	52,883		37,659		69,134
Income (loss) from discontinued operations, net of income taxes	0		102		-449
Net income (loss)	$52,883		$37,761		$68,685
Basic net income (loss) per share:
Income (loss) from continuing operations (in dollars per share)	$2.91		$2.19		$4.21
Income (loss) from discontinued operations (in dollars per share)	$0		$0.01		($0.03)
Net income (loss) (in dollars per share)	$2.91		$2.20		$4.18
Diluted net income (loss) per share:
Income (loss) from continuing operations (in dollars per share)	$2.83		$2.12		$4.07
Income (loss) from discontinued operations (in dollars per share)	$0		$0.01		($0.03)
Net income (loss) (in dollars per share)	$2.83		$2.13		$4.04
Shares used in computing:
Basic net income per share	18,177,178		17,197,840		16,426,209
Diluted net income per share	18,697,778		17,768,075		16,991,158
[1]	Net sales are allocated to countries based on the location of the customer.

CONSOLIDATED_STATEMENTS_OF_SHA

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $)	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
In Thousands, unless otherwise specified
Beginning Balance at Dec. 31, 2011	$338,256	$16,221	$52,738	$332,099	($62,802)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	68,685			68,685
Other comprehensive income (loss)	4,994				4,994
Stock options exercised	17,007	603	16,404
Stock issued to directors	0	15	-15
Shares issued for employees stock purchase plan	809	27	782
Shares issued for restricted stock	-752	38	-790
Stock-based compensation expense	5,153		5,153
Ending Balance at Dec. 31, 2012	434,152	16,904	74,272	400,784	-57,808
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	37,761			37,761
Other comprehensive income (loss)	46,358				46,358
Stock options exercised	32,426	859	31,567
Stock issued to directors	0	15	-15
Shares issued for employees stock purchase plan	734	24	710
Shares issued for restricted stock	-1,297	53	-1,350
Stock-based compensation expense	5,393		5,393
Ending Balance at Dec. 31, 2013	555,527	17,855	110,577	438,545	-11,450
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	52,883			52,883
Other comprehensive income (loss)	-53,644				-53,644
Stock options exercised	20,513	465	20,048
Stock issued to directors	0	16	-16
Shares issued for employees stock purchase plan	693	16	677
Shares issued for restricted stock	-1,542	52	-1,594
Stock-based compensation expense	7,533		7,533
Ending Balance at Dec. 31, 2014	$581,963	$18,404	$137,225	$491,428	($65,094)

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Income (loss) from continuing operations, net of tax	$52,883	$37,659	$69,134
Foreign currency translation adjustments	-36,949	10,171	6,710
Net unrealized gain (loss) (net of taxes of $1,555 in 2012) on marketable securities.			1,168
Unrealized gain (loss) on derivative instruments held at year end (net of taxes of $50 in 2014, $110 in 2013 and $127 in 2012)	-93	-210	-235
Unrealized gain (loss) reclassified into earnings	209	236	270
Actuarial net gain (loss) incurred in fiscal year	-20,715	32,749	-6,687
Amortization of gain (loss)	3,904	2,482	3,760
Amortization of prior service credit (cost)	0	930	8
Other comprehensive income (loss)	-53,644	46,358	4,994
Comprehensive income (loss) from continuing operations	-761	84,017	74,128
Income (loss) from discontinued operations, net of income taxes	0	102	-449
Comprehensive (loss) income	($761)	$84,119	$73,679

CONSOLIDATED_STATEMENTS_OF_COM1

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (PARENTHETICAL) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Unrealized gain (loss) on marketable securities, tax	$0	$0	$1,555
Unrealized gain (loss) on derivative instruments, tax	$50	$110	$127

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Activities:
Net income (loss)	$52,883	$37,761	$68,685
Loss (income) from discontinued operations	0	-102	449
Adjustments to reconcile net income to cash provided by (used in) operating activities:
Depreciation and amortization	26,268	26,351	27,130
Stock-based compensation expense	7,533	5,393	5,153
Loss from long-term investments	0		3,245
Deferred income taxes	8,150	5,634	-58,253
Equity in income of unconsolidated joint ventures, net	-4,123	-4,326	-4,743
Dividends received from unconsolidated joint ventures	3,849	5,162	6,553
Pension and postretirement benefits	1,976	5,118	13,579
Gain from the sale of property, plant and equipment	-69	-7	-1,404
Impairment of assets/investments	0	4,620	539
Changes in operating assets and liabilities excluding effects of acquisition and disposition of businesses:
Accounts receivable	-11,146	-2,972	-2,333
Accounts receivable, joint ventures	958	245	-502
Inventories	-5,240	7,188	5,873
Pension contribution	-14,645	-13,751	-23,518
Other current assets	1,063	639	-1,497
Accounts payable and other accrued expenses	16,638	9,020	-3,461
Other, net	1,112	-8,806	4,872
Net cash provided by (used in) operating activities of continuing operations	85,207	77,167	40,367
Net cash provided by (used in) operating activities of discontinued operations		848	-328
Net cash provided by (used in) operating activities	85,207	78,015	40,039
Investing Activities:
Capital expenditures	-28,755	-16,859	-23,774
Proceeds from the sale of property, plant and equipment, net	69	7	2,804
Other investing activities	166	-127	0
Redemptions of long-term investments	0	0	25,438
Acquisition of business, net of cash received		0	-3,100
Net cash provided by (used in) investing activities of continuing operations	-28,520	-16,979	1,368
Net cash provided by (used in) investing activities of discontinued operations	0	0	0
Net cash provided by (used in) investing activities	-28,520	-16,979	1,368
Financing Activities:
Repayment of debt principal and long term lease obligation	-17,797	-21,206	-25,519
Proceeds from issuance of capital stock, net	20,513	32,426	17,007
Issuance of restricted stock	-1,542	-1,297	-752
Proceeds from issuance of shares to employee stock purchase plan	693	734	809
Net cash provided by (used in) financing activities of continuing operations	1,867	10,657	-8,455
Effect of exchange rate fluctuations on cash	-13,063	5,328	2,183
Net increase (decrease) in cash and cash equivalents	45,491	77,021	35,135
Cash and cash equivalents at beginning of year	191,884	114,863	79,728
Cash and cash equivalents at end of year	$237,375	$191,884	$114,863

Organization_and_Summary_of_Si

Organization and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Organization and Summary of Significant Accounting Policies	ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Organization
	Our reporting structure is comprised of the following operating segments: Printed Circuit Materials (PCM), High Performance Foams (HPF), Power Electronics Solutions (PES) and the Other reportable segment.
	•	Printed Circuit Materials
	The Printed Circuit Materials operating segment includes printed circuit board laminate products for high frequency, high performance applications. These products have characteristics that offer performance and other functional advantages in many market applications and serve to differentiate our products from other commonly available materials. These products are sold principally to independent and captive printed circuit board fabricators that convert our laminates to custom printed circuits.
	The polymer-based dielectric layers of our circuit board laminates are proprietary materials that provide highly specialized electrical and mechanical properties. Trade names for our printed circuit board materials include RO3000®, RO4000®, RT/duroid®, ULTRALAM®, RO2800®, LoPro®, COOLSPAN® and TMM® laminates. All of these laminates are used for making circuitry that receive, transmit, and process high frequency communications signals, yet each laminate has varying properties that address specific needs and applications within the communications market. High frequency circuits are used in the equipment and devices that comprise wireless communications systems, including cellular communications, digital cellular communications, paging, direct broadcast television, global positioning, mobile radio communications, and radar for both aviation and automotive applications.
	•	High Performance Foams
	The High Performance Foams operating segment includes polyurethane and silicone foam as well as solid products manufactured in roll stock, sheet, and molded formats. These materials have characteristics that offer functional advantages in many market applications which serve to differentiate Rogers' products from other commonly available materials.
	High Performance Foams products are sold globally to converters, fabricators, distributors and original equipment manufacturers (OEMs) for use in general industrial applications, portable electronics including mobile internet devices, consumer goods, mass transportation, construction, printing applications and other markets. Trade names for our High Performance Foams include: PORON® Microcellular Urethanes used for making high performance gaskets and seals in vehicles, portable communications devices, computers and peripherals; PORON® cushion insole materials for footwear and related products; PORON® healthcare and medical materials for body cushioning and orthotic appliances; R/bak® compressible printing plate backing and mounting products for cushioning flexographic plates for printing on packaging materials; PORON® and XRD® for high impact cushioning protection; Rogers BISCO® silicone foams, solids, sponge and extrusion products for flame retardant gaskets, seals and cushioning applications in communications infrastructure equipment, aircraft, trains, cars and trucks, and for shielding extreme temperature or flame; and eSORBA® urethane foams used in portable communications, entertainment devices and other industrial applications.
	We have two 50% owned joint ventures that extend and complement our worldwide business in High Performance Foams. Rogers INOAC Corporation (RIC), a joint venture with Japan-based INOAC Corporation, manufactures high performance polyurethane foam materials in Mie and Taketoyo, Japan to predominantly serve the Japanese and Taiwanese markets. Rogers INOAC Suzhou Corporation (RIS) was established in 2004 with INOAC Corporation and provides polyurethane foam materials primarily to the Asian marketplace.
	•	Power Electronics Solutions
	The Power Electronics Solutions operating segment is comprised of direct bond copper (DBC) ceramic substrate products and busbar power distribution products. We believe that our advanced, customized components enable the performance and reliability of today’s growing array of power electronic devices and serve to increase the efficiency of applications by managing heat and ensuring the reliability of these critical devices used in converting raw energy into controlled and regulated power that can be used and managed.
	Trade names for our Power Electronics Solutions products include curamik® ceramic substrates and RO-LINX® products. Curamik® ceramic substrates are used in the design of intelligent power management devices, such as insulated gate bipolar transistor (IGBT) modules, which enable a wide range of products including highly efficient industrial motor drives, wind and solar converters and electric and hybrid electric vehicle drive systems. RO-LINX® products are used in high power electrical inverter and converter systems for use in mass transit (e.g. high speed trains); clean technology applications (e.g. wind turbines, solar farms and electric vehicles) and variable frequency drives for high to mid power applications.
	•	Other
	The Other reportable segment consists of elastomer components, floats and inverter distribution activities. Elastomer components are sold to OEMs for applications in ground transportation, office equipment, consumer and other markets. Trade names for our elastomer components include: NITROPHYL® floats for level sensing in fuel tanks, motors, and storage tanks and ENDUR® elastomer rollers and belts for document handling in copiers, printers, mail sorting machines and automated teller machines. Inverters are sold primarily to OEMs and fabricators that in turn sell to various other third parties primarily serving the portable communication and automotive markets.
	Principles of Consolidation
	The consolidated financial statements include the accounts of the Company and our wholly‑owned subsidiaries, after elimination of inter-company accounts and transactions.
	For all periods and amounts presented, reclassifications have been made for discontinued operations. In the fourth quarter of 2012, the operations of the non-woven composite materials operating segment (aggregated in the Other reportable segment) ended and the segment qualified as a discontinued operations. See Note 17 - Discontinued Operations for further discussion.
	Cash Equivalents
	Highly liquid investments with original maturities of 3 months or less are considered cash equivalents. These investments are stated at cost, which approximates fair value.
	Marketable Securities
	We determine the appropriate classification of debt securities at the time of purchase and reevaluate such designation as of each balance sheet date. Debt securities are classified as held-to-maturity when we have the positive intent and ability to hold the securities to maturity. Marketable equity securities and debt securities not classified as held-to-maturity are classified as available-for-sale. Available-for-sale securities are carried at fair value with interest on such securities included in “Interest income” on our consolidated statements of income (loss). If the market values of individual securities are determined to be “other than temporarily” impaired, the carrying amount of such investments are written down to market value through “Net realized gain (loss)” in our consolidated statements of income (loss). Except for amounts recorded related to the auction rate securities in 2012, we have not recorded any such write down in 2014, 2013 or 2012. See Note 2 - Fair Value Measurements for further discussion on the auction rate securities.
	Investments in Unconsolidated Joint Ventures
	We account for our investments in and advances to unconsolidated joint ventures, all of which are 50% owned, using the equity method of accounting.
	Foreign Currency
	All balance sheet accounts of foreign subsidiaries are translated or remeasured at exchange rates in effect at each year end, and income statement items are translated at the average exchange rates for the year. Resulting translation adjustments for those entities that operate under the local currency are made directly to a separate component of shareholders' equity, while remeasurement adjustments for those entities that operate under the parent's functional currency are made to the income statement as a component of “Other income (expense), net”. Currency transaction adjustments are reported as income or expense in the consolidated statements of income (loss) as a component of "Other income (expense), net". Such adjustments resulted in a loss of $0.0 million in 2014, a loss of $0.7 million in 2013, and a loss of $0.8 million in 2012.
	Allowance for Doubtful Accounts
	The allowance for doubtful accounts is determined based on a variety of factors that affect the potential collectability of the related receivables, including the length of time receivables are past due, customer credit ratings, financial stability of customers, specific one-time events and past customer history. In addition, in circumstances where we are made aware of a specific customer's inability to meet its financial obligations, a specific allowance is established. The majority of accounts are individually evaluated on a regular basis and appropriate reserves are established as deemed appropriate based on the criteria previously mentioned. The remainder of the reserve is based on management's estimates and takes into consideration historical trends, market conditions and the composition of our customer base.
	Inventories
	Inventories are valued at the lower of cost or market. Certain inventories, amounting to $12.5 million and $12.7 million at December 31, 2014 and 2013, respectively, are valued using the last-in, first-out (LIFO) method. These inventories accounted for 24% of total gross inventory in 2014 and 25% of total gross inventory in 2013. The cost of the remaining portion of the inventories was determined principally on the basis of first-in, first-out (FIFO) costs.
	If the inventories valued using the LIFO method had been valued at FIFO costs, their value would have increased by approximately $8.2 million and $7.4 million at December 31, 2014 and 2013, respectively.
	Inventories consisted of the following:
	(Dollars in thousands)	December 31, 2014		December 31, 2013
	Raw materials	$	26,787	$	24,301
	Work-in-process	16,564		13,536
	Finished goods	25,277		29,052
	Total Inventory	$	68,628	$	66,889
	Property, Plant and Equipment
	Property, plant and equipment are stated on the basis of cost. For financial reporting purposes, provisions for depreciation are calculated on a straight‑line basis over the following estimated useful lives of the underlying assets:
		Years
	Buildings and improvements	15-Oct
	Machinery and equipment	15-May
	Office equipment	10-Mar
	Software Costs
	We capitalize certain computer software and software development costs incurred in connection with developing or obtaining computer software for internal use when both the preliminary project stage is completed and it is probable that the software will be used as intended. Capitalized software costs include only (i) external direct costs of materials and services utilized in developing or obtaining computer software, and (ii) compensation and related benefits for employees who are directly associated with the software project. Capitalized software costs are included in property, plant and equipment on our balance sheet and amortized on a straight-line basis when placed into service over the estimated useful lives of the software, which approximates three to five years. We initiated projects with capitalized software for the first time in 2014. We have recorded software amortization of $0.0 million in 2014, as the projects have not completed as of year end 2014. Net capitalized software and development costs were $3.4 million as of December 31, 2014.
	Goodwill and Intangible Assets
	Intangible assets are classified into three categories: (1) intangible assets with definite lives subject to amortization; (2) intangible assets with indefinite lives not subject to amortization; and (3) goodwill. We review goodwill, which has an indefinite life, and intangible assets with indefinite lives for impairment annually and/or if events or changes in circumstances indicate the carrying value of an asset may have been impaired. We review intangible assets with definite lives for impairment whenever conditions exist that indicate the carrying value may not be recoverable, such as in economic downturns in a market or a change in the assessment of future operations.
	Goodwill and indefinite lived intangible assets are assessed for impairment by comparing the net book value of a reporting unit to its estimated fair value. Fair values are typically established using a discounted cash flow methodology. The determination of discounted cash flows is based on the reporting unit's strategic plans and long-term operating forecasts. The revenue growth rates included in the plans are management's best estimates based on current and forecasted market conditions, and the profit margin assumptions are projected by each segment based on the current cost structure and strategic changes to the cost structure.
	Purchased or acquired patents, covenants-not-to-compete, customer relationships and licensed technology are capitalized and amortized on a straight-line or accelerated basis over their estimated useful lives.
	Environmental and Product Liabilities
	We accrue for our environmental investigation, remediation, operating and maintenance costs when it is probable that a liability has been incurred and the amount can be reasonably estimated. For environmental matters, the most likely cost to be incurred is accrued based on an evaluation of currently available facts with respect to each individual site, including existing technology, current laws and regulations and prior remediation experience. For sites with multiple potential responsible parties (PRPs), we consider our likely proportionate share of the anticipated remediation costs and the ability of the other parties to fulfill their obligations in establishing a provision for those costs. When no amount within a range of estimates is more likely to occur than another, we accrue to the low end of the range. When future liabilities are determined to be reimbursable by insurance coverage, an accrual is recorded for the potential liability and a receivable is recorded for the estimated insurance reimbursement amount. We are exposed to the uncertain nature inherent in such remediation and the possibility that initial estimates will not reflect the final outcome of a matter.
	We periodically perform a formal analysis to determine potential future liability and related insurance coverage for asbestos-related matters. Projecting future asbestos costs is subject to numerous variables that are extremely difficult to predict, including the number of claims that might be received, the type and severity of the disease alleged by each claimant, the long latency period associated with asbestos exposure, dismissal rates, costs of medical treatment, the financial resources of other companies that are co-defendants in claims, uncertainties surrounding the litigation process from jurisdiction to jurisdiction and from case to case, and the impact of potential changes in legislative or judicial standards, including potential tort reform. Furthermore, any predictions with respect to these variables are subject to even greater uncertainty as the projection period lengthens.
	The models developed for determining the potential exposure and related insurance coverage were developed by outside consultants deemed to be experts in their respective fields with the forecast for asbestos related liabilities generated by National Economic Research Associates, Inc. (NERA) and the related insurance receivable projections developed by Marsh Risk Consulting (Marsh). The models contain numerous assumptions that significantly impact the results generated by the models. We believe the assumptions made are reasonable at the present time, but are subject to uncertainty based on the actual future outcome of our asbestos litigation. We determined that a ten-year projection period is now appropriate as we have experience in addressing asbestos related lawsuits over the last few years to use as a baseline to project the liability over ten years. However, we do not believe we have sufficient data to justify a longer projection period at this time.
	Fair Value of Financial Instruments
	Management believes that the carrying values of financial instruments, including cash and cash equivalents, short-term investments, accounts receivable, accounts payable, accrued liabilities and debt approximate fair value based on the maturities of these instruments.
	Concentration of Credit and Investment Risk
	We extend credit on an uncollateralized basis to almost all customers. Concentration of credit and geographic risk with respect to accounts receivable is limited due to the large number and general dispersion of accounts that constitute our customer base. We routinely perform credit evaluations on our customers. At December 31, 2014 and 2013, there were no customers that individually accounted for more than ten percent of total accounts receivable. We did not experience significant credit losses on customers' accounts in 2014, 2013 or 2012.
	We invest excess cash principally in investment grade government and corporate debt securities. We have established guidelines relative to diversification and maturities in order to maintain safety and liquidity. These guidelines are periodically reviewed and modified to reflect changes in market conditions.
	Income Taxes
	We are subject to income taxes in the U.S. and in numerous foreign jurisdictions. We consider the undistributed earnings as of December 31, 2014 of substantially all of our foreign subsidiaries to be indefinitely reinvested and, accordingly, no U.S. income taxes have been provided thereon. If circumstances change and it becomes apparent that some, or all of the undistributed earnings as of December 31, 2014 will not be indefinitely reinvested, the provision for the tax consequences, if any, will be recorded in the period when circumstances change. Distributions out of current and future earnings are permissible to fund discretionary activities such as business acquisitions. However, when distributions are made, this could result in a higher effective tax rate.
	We have provided for potential liabilities due in various jurisdictions. In the ordinary course of global business, there are many transactions and calculations where the ultimate tax outcome is uncertain. Some of these uncertainties arise as a consequence of cost reimbursement arrangements among related entities. Although we believe our estimates are reasonable, no assurance can be given that the final tax outcome of these matters will not be different than that which is reflected in the historical income tax provisions and accruals. Such differences could have a material impact on our income tax provision and operating results in the period in which such determination is made.
	Deferred income taxes are determined based on the estimated future tax effects differences between the financial statement carrying amounts and the tax bases of existing assets and liabilities. Deferred tax assets are recognized to the extent that realization of those assets is considered to be more likely than not. A valuation allowance is established for deferred taxes when it is more likely than not that all or a portion of the deferred tax assets will not be realized.
	We record benefits for uncertain tax positions based on an assessment of whether it is more likely than not that the tax positions will be sustained by the taxing authorities. If this threshold is not met, no tax benefit of the uncertain position is recognized. If the threshold is met, we recognize the largest amount of the tax benefit that is more than 50 percent likely to be realized upon ultimate settlement with the related tax authority.
	We recognize interest and penalties related to unrecognized tax benefits within the income tax expense line in the accompanying consolidated statements of income (loss). Accrued interest and penalties are included within the related tax liability line in the consolidated statements of financial position.
Revenue Recognition
Revenue from product sales to customers is recognized when title passes to the customer, when persuasive evidence of an arrangement exists, the price is fixed or determinable, and collection is reasonably assured.
Shipping and Handling Charges
Costs that we incur for shipping and handling charges are charged to “Cost of sales” and payments received from our customers for shipping and handling charges are included in “Net sales” on our consolidated statements of income (loss).
Pension and Retiree Health Care and Life Insurance Benefits
We provide various defined benefit pension plans for our U.S. employees and we sponsor multiple fully insured or self-funded medical plans and fully insured life insurance plans for retirees. In 2013, the defined benefit plans were frozen, so that future benefits no longer accrue. The costs and obligations associated with these plans are dependent upon various actuarial assumptions used in calculating such amounts. These assumptions include discount rates, long-term rate of return on plan assets, mortality rates, and other factors. The assumptions used in these models are determined as follows: (i) the discount rate used is based on the PruCurve index; (ii) the long-term rate of return on plan assets is determined based on historical portfolio results, market results and our expectations of future returns, as well as current market assumptions related to long-term return rates; and (iii) the mortality rate is based on a mortality projection that estimates current longevity rates and their impact on the long-term plan obligations. We review these assumptions periodically throughout the year and update as necessary.
Earnings Per Share
The following table sets forth the computation of basic and diluted earnings per share from continuing operations:
(In thousands, except per share amounts)	2014		2013		2012
Numerator:
Net income (loss)	$	52,883	$	37,659	$	69,134
Denominator:
Weighted-average shares outstanding - basic	18,177,178		17,197,840		16,426,209
Effect of dilutive shares	520,600		570,235		564,949
Weighted-average shares outstanding - diluted	18,697,778		17,768,075		16,991,158
Basic income (loss) per share:	$	2.91	$	2.19	$	4.21
Diluted income (loss) per share:	2.83		2.12		4.07
Certain potential ordinary shares were excluded from the calculation of diluted weighted-average shares outstanding because they would have an anti-dilutive effect on net income per share. No shares were excluded in 2014 or 2013. In 2012 68,000 shares were excluded.
Use of Estimates
The preparation of financial statements, in conformity with U.S. generally accepted accounting principles, requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.
Hedging Activity
We use derivative instruments to manage commodity, interest rate and foreign currency exposures. Derivative instruments are viewed as risk management tools and are not used for trading or speculative purposes. To qualify for hedge accounting treatment, derivatives used for hedging purposes must be designated and deemed effective as a hedge of the identified underlying risk exposure at the inception of the contract. Accordingly, changes in fair value of the derivative contract must be highly correlated with changes in the fair value of the underlying hedged item at inception of the hedge and over the life of the hedge contract.
Derivatives used to hedge forecasted cash flows associated with foreign currency commitments or forecasted commodity purchases are accounted for as cash flow hedges. For those derivative instruments that qualify for hedge accounting treatment, gains and losses are recorded in other comprehensive income and reclassified to earnings in a manner that matches the timing of the earnings impact of the hedged transactions. The ineffective portion of all hedges, if any, is recognized currently in earnings. For those derivative instruments that do not qualify for hedge accounting treatment, any related gains and losses are recognized in the consolidated statements of income (loss) as a component of "Other income/expense".
Advertising Costs
Advertising is expensed as incurred and amounted to $3.3 million for 2014, $2.9 million for 2013 and $2.0 million for 2012.
Equity Compensation
Stock-based compensation is comprised of stock options and restricted stock. Stock options are measured at the grant date, based on the grant-date fair value of the awards ultimately expected to vest and, in most cases, is recognized as an expense on a straight-line basis over the vesting period, which is typically four years. A provision in our stock option agreements requires us to accelerate the expense for retirement eligible employees, as any unvested options would immediately vest upon retirement for such employees. We develop estimates used in calculating the grant-date fair value of stock options to determine the amount of stock-based compensation to be recorded. We calculate the grant-date fair value using the Black-Scholes valuation model. The use of this valuation model requires estimates of assumptions such as expected volatility, expected term, risk-free interest rate, expected dividend yield and forfeiture rates.
Performance-based restricted stock compensation expense is based on achievement of certain performance and service conditions. The fair value of the awards is determined based on the market value of the underlying stock price at the grant date and marked to market over the vesting period based on projections of the underlying performance measures.
Time-based restricted stock compensation awards are expensed over the vesting period, which is typically three years. The fair value of the awards is determined based on the market value of the underlying stock price at the grant date.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS
	The accounting guidance for fair value measurements establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value.
	•	Level 1 – Quoted prices in active markets for identical assets or liabilities.
	•	Level 2 – Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
	•	Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
	From time to time we enter into various instruments that require fair value measurement, including foreign currency contracts, interest rate swaps and copper derivative contracts. Assets measured at fair value on a recurring basis, categorized by the level of inputs used in the valuation, include:
	(Dollars in thousands)	Carrying amount as of			Level 1		Level 2			Level 3
		31-Dec-14
	Pension assets	$	170,600		$	51,097	$	107,739		$	11,764
	Foreign currency contracts	(18		)	—		(18		)	—
	Copper derivative contracts	355			—		355			—
	Interest rate swap	(144		)	—		(144		)	—
	(Dollars in thousands)	Carrying amount as of			Level 1		Level 2			Level 3
		31-Dec-13
	Pension assets	$	171,218		$	119,277	$	38,584		$	13,357
	Foreign currency contracts	(77		)	—		(77		)	—
	Copper derivative contracts	984			—		984			—
	Interest rate swap	(296		)	—		(296		)	—
	The following table presents information about our assets and liabilities measured at fair value on a non-recurring basis as of December 31, 2014, aggregated by the level in the fair value hierarchy within which those measurements fall. This Level 3 asset represents the investment in Solicore, Inc. The valuation is based on our evaluation of Solicore's financial performance through December 31, 2014 and the most recent round of capital financing that was initiated in the fourth quarter of 2014. See Note 8 - Investment for further details.
	(Dollars in thousands)	Carrying amount as of December 31, 2014			Level 1		Level 2			Level 3
	Solicore investment	$	341		$	—	$	—		$	341
	The table below sets forth a summary of changes in the fair value of the Solicore investment Level 3 asset for the year ended December 31, 2014.
	(Dollars in thousands)	Solicore investment
	Balance at beginning of year	$	507
	Cash investment	—
	Impairment reported in earnings	(166		)
	Balance at end of year	$	341
	Auction Rate Securities
	During the first quarter of 2012, we liquidated our auction rate security portfolio, receiving net proceeds of $25.4 million on a stated par value of $29.5 million. As a result of this liquidation, we recognized a loss on the discount of the securities of $3.2 million (the remaining difference between the liquidation and par value of $0.9 million had previously been recognized as an impairment loss) in our earnings.
	Derivatives Contracts
	We are exposed to certain risks relating to our ongoing business operations. The primary risks being managed through the use of derivative instruments are interest rate risk, foreign currency exchange rate risk and commodity pricing risk (particularly related to copper).
	Foreign Currency - The fair value of any foreign currency option derivatives 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 (Copper) - The fair value of copper derivatives is computed using a combination of intrinsic and time value valuation models. The intrinsic valuation model reflects the difference between the strike price of the underlying copper derivative instrument and the current prevailing copper prices in an over-the-counter market at period end. The time value valuation model incorporates the constant changes in the price of the underlying copper derivative instrument, the time value of money, the underlying copper derivative instrument's strike price and the remaining time to the underlying copper derivative instrument's expiration date from the period end date. Overall, fair value is a function of five primary variables: price of the underlying instrument, time to expiration, strike price, interest rate, and volatility.
	Interest Rates - The fair value of our 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 counterparty's credit ratings.
	We do not use derivative financial instruments for trading or speculation purposes.
	For further discussion on our derivative contracts, see Note 3 - Hedging Transactions and Derivative Financial Instruments.
	Pension Assets
	Our pension assets are stated at fair value on an annual basis and there are categories of assets in Level 1, 2 and 3 of the fair value hierarchy. See further discussion in Note 9 - Pension Benefits and Retirement Health and Life Insurance Benefits.

Hedging_Transactions_and_Deriv

Hedging Transactions and Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Hedging Transactions and Derivative Financial Instruments	HEDGING TRANSACTIONS AND DERIVATIVE FINANCIAL INSTRUMENTS
	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 consolidated 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 (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 consolidated statements of income (loss) associated with the forecasted transaction and in the same period or periods during which the hedged transaction affects earnings. The remaining gain or loss on the derivative instrument in excess of the cumulative change in the present value of the future cash flows of the hedged item (i.e., the ineffective portion) if any, is recognized in the earnings during the current period. There was no material ineffectiveness for the year ended December 31, 2014 or 2013.
	As of December 31, 2014, we have sixteen outstanding contracts to hedge our exposure related to the purchase of copper by our Power Electronics Solutions and Printed Circuit Materials operating segments. These contracts are held with financial institutions and minimize our risk associated with a potential rise in copper prices. These contracts cover the 2015 and 2016 monthly copper exposure and do not qualify for hedge accounting treatment; therefore, any mark-to-market adjustments required on these contracts are recorded in the "Other income, net" line item in our consolidated statements of income (loss).
	In 2014, we entered into Euro, Japanese Yen, U.S Dollar, South Korean Won, Chinese Yuan and Hungarian Forint currency forward contracts. We entered into these foreign currency forward contracts to mitigate certain global balance sheet exposures. Mark-to-market adjustments required on the contracts that do not qualify for hedge accounting treatment are recorded in the "Other income, net" line item in our consolidated statements of income (loss).
	In 2012, we entered into an interest rate swap derivative instrument to hedge the LIBOR portion of the interest rate on 65% of the term loan debt then outstanding, effective July 2013. This transaction has been designated as a cash flow hedge and qualifies for hedge accounting treatment. At December 31, 2014, the term loan debt of $60.0 million represents all of our total outstanding debt. At December 31, 2014, the rate charged on this debt is the 1 month LIBOR at 0.1875% plus a spread of 1.75%.
	Notional Value of Copper Derivatives
	January 2015- March 2015	156 metric tons per month
	April 2015 - June 2015	150 metric tons per month
	July 2015 - September 2015	135 metric tons per month
	October 2015 - December 2015	123 metric tons per month
	January 2016 - March 2016	30 metric tons per month
	Notional Values of Foreign Currency Derivatives
	YEN/USD	¥	200,000,000
	KRW/USD	₩	1,854,700,000
	YEN/EUR	¥	315,000,000
	HUF/EUR	50,000,000
	CNY/USD	¥	134,000,000
	(Dollars in thousands)		The Effect of Current Derivative Instruments on the Financial Statements for the year ended December 31, 2014				Fair Values of Derivative Instruments as of December 31, 2014
			Location of gain (loss)	Amount of			Other Assets
	Foreign Exchange Contracts			gain (loss)			(Liabilities)
	Contracts not designated as hedging instruments		Other income, net	$	(19	)	$	(19	)
	Copper Derivative Instruments
	Contracts not designated as hedging instruments		Other income, net	(605		)	355
	Interest Rate Swap Instrument
	Contracts designated as hedging instruments		Other comprehensive income (loss)	152			(144		)
	(Dollars in thousands)		The Effect of Current Derivative Instruments on the Financial Statements for the year ended December 31, 2013				Fair Values of Derivative Instruments as of December 31, 2013
			Location of gain (loss)	Amount of			Other Assets
	Foreign Exchange Contracts			gain (loss)			(Liabilities)
	Contracts not designated as hedging instruments		Other income, net	$	(79	)	$	(79	)
	Contracts designated as hedging instruments		Other comprehensive income (loss)	(24		)	2
	Copper Derivative Instruments
	Contracts not designated as hedging instruments		Other income, net	(373		)	984
	Interest Rate Swap Instrument
	Contracts designated as hedging instruments		Other comprehensive income (loss)	(296		)	(296		)
	Concentration of Credit Risk
	By using derivative instruments, we are subject to credit and market risk. If a counterparty fails to fulfill its performance obligations under a derivative contract, our credit risk will equal the fair value of the derivative instrument. Generally, when the fair value of a derivative contract is positive, the counterparty owes the Company, thus creating a receivable risk for the Company. We minimize counterparty credit (or repayment) risk by entering into derivative transactions with major financial institutions with investment grade credit ratings.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	The changes in accumulated other comprehensive income (loss) by component for the year ended December 31, 2014 were as follows:
	(Dollars in thousands)	Foreign currency translation adjustments			Funded status of pension plans and other postretirement benefits (1)			Unrealized gain (loss) on derivative instruments (2)			Total
	Beginning Balance December 31, 2013	$	22,756		$	(33,997	)	$	(209	)	$	(11,450	)
	Other comprehensive income before reclassifications	(36,949		)	—			(93		)	(37,042		)
	Actuarial net gain (loss) incurred in the fiscal year	—			(20,715		)	—			(20,715		)
	Amounts reclassified from accumulated other comprehensive income	—			3,904			209			4,113
	Net current-period other comprehensive income	(36,949		)	(16,811		)	116			(53,644		)
	Ending Balance December 31, 2014	$	(14,193	)	$	(50,808	)	$	(93	)	$	(65,094	)
	(1) Net of taxes of $11,952 and $2,900 for the periods ended December 31, 2014 and December 31, 2013, respectively.
	(2) Net of taxes of $50 and $110 for the periods ended December 31, 2014 and December 31, 2013, respectively.
	The changes in accumulated other comprehensive income (loss) by component for the year ended December 31, 2013 were as follows:
	(Dollars in thousands)	Foreign currency translation adjustments			Funded status of pension plans and other postretirement benefits (3)			Unrealized gain (loss) on derivative instruments (4)			Total
	Beginning Balance December 31, 2012	$	12,585		$	(70,158	)	$	(235	)	$	(57,808	)
	Other comprehensive income before reclassifications	10,171			—			(210		)	9,961
	Actuarial net gain (loss) incurred in the fiscal year	—			32,749			—			32,749
	Amounts reclassified from accumulated other comprehensive income	—			3,412			236			3,648
	Net current-period other comprehensive income	10,171			36,161			26			46,358
	Ending Balance December 31, 2013	$	22,756		$	(33,997	)	$	(209	)	$	(11,450	)
	(3) Net of taxes of $2,900 and $22,371 for the periods ended December 31, 2013 and December 31, 2012, respectively.
	(4) Net of taxes of $110 and $127 for the periods ended December 31, 2013 and December 31, 2012, respectively.
	The reclassifications out of accumulated other comprehensive income (loss) for the year ended December 31, 2014 were as follows:
	Details about accumulated other comprehensive income components	Amounts reclassified from accumulated other comprehensive income (loss) for the period ended December 31, 2014			Affected line item in the statement where net income is presented
	Unrealized gains and losses on derivative instruments:
		$	321		Realized gain (loss)
		(112		)	Tax benefit (expense)
		$	209		Net of tax
	Amortization of defined benefit pension and other post-retirement benefit items:
	Prior service costs	$	—		-5
	Actuarial losses	6,006			-5
		6,006			Total before tax
		(2,102		)	Tax benefit (expense)
		$	3,904		Net of tax
	(5) These accumulated other comprehensive income components are included in the computation of net periodic pension cost. See Note 9 - "Pension Benefits and Retirement Health and Life Insurance Benefits" for additional details.
	The reclassifications out of accumulated other comprehensive income (loss) for the year ended December 31, 2013 were as follows:
	Details about accumulated other comprehensive income components	Amounts reclassified from accumulated other comprehensive income (loss) for the period ended December 31, 2013			Affected line item in the statement where net income is presented
	Unrealized gains and losses on derivative instruments:
		$	363		Realized gain (loss)
		(127		)	Tax benefit (expense)
		$	236		Net of tax
	Amortization of defined benefit pension and other post-retirement benefit items:
	Prior service costs	$	1,431		-6
	Actuarial losses	3,819			-6
		5,250			Total before tax
		(1,838		)	Tax benefit (expense)
		$	3,412		Net of tax
	(6) These accumulated other comprehensive income components are included in the computation of net periodic pension cost. See Note 9 - "Pension Benefits and Other Postretirement Benefit Plans" for additional details.

Property_Plant_and_Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	PROPERTY, PLANT AND EQUIPMENT
	(Dollars in thousands)	December 31,			December 31,
		2014			2013
	Land	$	14,045		$	14,986
	Buildings and improvements	132,105			136,959
	Machinery and equipment	165,979			160,843
	Office equipment	36,810			34,972
	Equipment in process	26,573			21,360
		375,512			369,120
	Accumulated depreciation	(225,092		)	(222,189		)
	Total property, plant and equipment, net	$	150,420		$	146,931
	Depreciation expense was $20.1 million in 2014, $20.4 million in 2013, and $22.7 million in 2012. As part of the acquisition of Curamik in 2011, we acquired a capital lease on its facility in Eschenbach, Germany. At December 31, 2011 this capital lease was recorded in Property, plant and equipment in our consolidated statements of financial position for $12.1 million, net of accumulated depreciation. The total obligation recorded for the lease as of December 31, 2014 and 2013 was $6.8 million and $8.0 million, respectively. Depreciation expense related to the capital lease was $0.4 million, $0.4 million and $0.4 million for the years ending December 31, 2014, 2013 and 2012, respectively. Accumulated depreciation for the capital lease as of December 31, 2014 and 2013 was $1.6 million and $1.2 million, respectively.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	GOODWILL AND INTANGIBLE ASSETS
	Definite Lived Intangible Assets
	(Dollars in thousands)	December 31, 2014								December 31, 2013
		Gross Carrying Amount			Accumulated Amortization		Net Carrying Amount			Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Trademarks and patents	$	1,046		$	364	$	682		$	1,075	$	303		$	772
	Technology	33,942			15,958		17,984			37,825		13,340			24,485
	Covenant-not-to-compete	1,016			823		193			1,056		628			428
	Customer relationships	19,123			4,406		14,717			21,280		3,235			18,045
	Total other intangible assets	$	55,127		$	21,551	$	33,576		$	61,236	$	17,506		$	43,730
	In the table above, gross carrying amounts and accumulated amortization may differ from prior periods due to foreign exchange rate fluctuations.
	Amortization expense was approximately $6.1 million, $6.0 million and $4.4 million in 2014, 2013 and 2012, respectively. The estimated annual future amortization expense is $5.3 million, $4.9 million, $4.5 million, $3.9 million and $3.4 million in 2015, 2016, 2017, 2018 and 2019, respectively. These amounts could vary based on changes in foreign currency exchange rates.
	The weighted average amortization period as of December 31, 2014, by intangible asset class, is presented in the table below:
	Intangible Asset Class		Weighted Average Amortization Period
	Trademarks and patents		7.6
	Technology		4.7
	Covenant not-to-compete		2
	Customer relationships		7.4
	Total other intangible assets		5.9
	On January 4, 2011 we acquired Curamik, a manufacturer of power electronic substrate products, which contributed $52.4 million of intangible assets and $79.8 million of goodwill. The intangible assets are comprised of trademarks, technology, and customer relationships and include approximately $5.3 million of indefinite-lived intangible assets comprised of trademarks, which are assessed for impairment annually or when changes in circumstances indicate that the carrying values may not be recoverable. The definite-lived intangible assets are amortized using a fair value methodology that is based on the projected economic use of the related underlying asset.
	Goodwill
	The changes in the carrying amount of goodwill for the period ending December 31, 2014, by reportable segment, were as follows:
	(Dollars in thousands)	High Performance Foams			Printed Circuit Materials		Power Electronics Solutions			Other		Total
	December 31, 2013	$	24,205		$	—	$	82,242		$	2,224	$	108,671
	Foreign currency translation adjustment	(640		)	—		(9,804		)	—		(10,444		)
	December 31, 2014	$	23,565		$	—	$	72,438		$	2,224	$	98,227
	Annual Impairment Testing
	We perform our annual goodwill impairment testing in the fourth quarter of the year. In 2014, we estimated the fair value of our reporting units using an income approach based on the present value of future cash flows. We believe this approach yields the most appropriate evidence of fair value as our reporting units are not easily compared to other corporations involved in similar businesses. We further believe that the assumptions and rates used in our annual impairment test are reasonable, but inherently uncertain. We currently have three reporting units with goodwill and intangible assets - High Performance Foams, Curamik and the Elastomer Components Division (ECD). The HPF, Curamik and ECD reporting units had allocated goodwill of approximately $23.6 million, $72.4 million and $2.2 million, respectively, at December 31, 2014. No impairment charges resulted from these analyses. The excess of fair value over carrying value for these reporting units was 318% for HPF, 85% for Curamik and 77% for ECD. From a sensitivity perspective, if the fair value of these reporting units declined by 10%, the fair value of the HPF reporting unit would exceed its carrying value by approximately 277%, the fair value of the Curamik reporting unit would exceed its carrying value by approximately 65%, and the fair value of the ECD reporting unit would exceed its carrying value by approximately 60%. These valuations are based on a five year discounted cash flow analysis, which utilized a discount rates ranging from 13.0% for HPF and ECD to 15.5% for Curamik and a terminal year growth rate of 3% for all three reporting units.

Summarized_Financial_Informati

Summarized Financial Information of Unconsolidated Joint Ventures	12 Months Ended
	Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]
Summarized Financial Information of Unconsolidated Joint Ventures	SUMMARIZED FINANCIAL INFORMATION OF UNCONSOLIDATED JOINT VENTURES
	As of December 31, 2014, we had two joint ventures, each 50% owned, which are accounted for under the equity method of accounting.
	Joint Venture	Location	Reportable Segment	Fiscal Year-End
	Rogers INOAC Corporation (RIC)	Japan	High Performance Foams	October 31
	Rogers INOAC Suzhou Corporation (RIS)	China	High Performance Foams	December 31
	Equity income related to the joint ventures of $4.1 million, $4.3 million and $4.7 million for the years ended December 31, 2014, 2013 and 2012, respectively, is included in the consolidated statements of income (loss).
	The summarized financial information for the joint ventures for the periods indicated is as follows:
	(Dollars in thousands)	31-Dec-14			31-Dec-13
	Current assets	$	31,155		$	32,033
	Noncurrent assets	9,427			10,303
	Current liabilities	6,473			5,943
	Shareholders' equity	34,109			36,393
	(Dollars in thousands)	For the years then ended:
		December 31,			December 31,		December 31,
		2014			2013		2012
	Net sales	$	48,259		$	52,982	$	63,297
	Gross profit (loss)	14,277			15,214		17,280
	Net income (loss)	8,246			8,652		9,486
	The effect of transactions between us and our unconsolidated joint ventures was accounted for on a consolidated basis. Receivables from and payables to joint ventures arise during the normal course of business from transactions between us and the joint ventures, typically from the joint venture purchasing raw materials from us to produce end products, which are sold to third parties, or from us purchasing finished goods from our joint ventures, which are then sold to third parties.

Investment

Investment	12 Months Ended
	Dec. 31, 2014
Investments, All Other Investments [Abstract]
Investment	INVESTMENT
	In the third quarter of 2009, we made a strategic investment of $5.0 million in Solicore, Inc., headquartered in Lakeland, Florida. Solicore is focused on penetrating the market for embedded power solutions, offering its patented Flexicon advanced ultra-thin, flexible, lithium polymer batteries for smart cards, controlled access cards, RFID tags, and medical devices. Our investment, part of a total of $13.3 million raised by Solicore in that financing round, provided us with a minority equity stake in Solicore and representation on Solicore's Board of Directors. We account for this investment under the cost method as we cannot exert significant influence over the business. We also entered into a joint development agreement with Solicore to develop the next generation of power solution products using screen printing technology. If this technology is adopted, we will have the option to manufacture a significant portion of the products that result from this collaboration. In the first quarter of 2013, we made an additional investment of $0.1 million in Solicore.
	During the fourth quarter of 2013, Solicore raised additional equity capital through a round of capital financing that  decreased our ownership interest in Solicore as we did not participate in this round of financing. Further, the financing round was issued at a significantly lower price than when we had initially invested in Solicore. In accordance with the applicable accounting guidance, this event represented an indicator of impairment. As a result, we performed an impairment analysis during the fourth quarter of 2013. The valuation was based on an option pricing methodology to estimate the per share value of the equity classes of stock held in Solicore. This method utilized a Black-Scholes option pricing model and the analytic process utilized to perform the valuation, which included back solving for the total equity value of Solicore. Based on the results of this valuation, there was a significant decline in the fair value of the Solicore business, which caused us to recognize an impairment charge on our investment in Solicore of approximately $4.6 million. The remaining book value of our investment in Solicore as of December 31, 2013 was $0.5 million.
	During the fourth quarter of 2014, we determined that Solicore continued to have negative business results, in addition to Rogers not participating in the latest round of financing initiated in the fourth quarter of 2014. As a result, we performed an impairment analysis during the fourth quarter of 2014. This valuation was done using the same methodology as performed in 2013, and described above. Based on the results of this valuation, there was a decline in the fair value of the Solicore business, which caused us to recognize an impairment charge on our investment in Solicore of approximately $0.2 million. The remaining book value of our investment in Solicore as of December 31, 2014 is approximately $0.3 million.

Pension_Benefit_and_Retirement

Pension Benefit and Retirement Health and Life Insurance Benefits	12 Months Ended
	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Pension Benefit and Retirement Health and Life Insurance Benefits	PENSION BENEFITS AND RETIREMENT HEALTH AND LIFE INSURANCE BENEFITS
	We have two qualified noncontributory defined benefit pension plans. One plan covers our U.S. unionized hourly employees and the other plan covers all other U.S. employees hired through December 30, 2007. We also have established a nonqualified unfunded noncontributory defined benefit pension plan 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 a fully insured life insurance plan for retirees. The measurement date for all plans is December 31 for each respective plan year.
	We are required, as an employer, to: (a) recognize in our statement 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 fiscal 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 income. 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 income (loss) and amortized into net periodic pension cost in future periods.
	Defined Benefit Pension Plan Amendments and Retiree Medical Plan Amendments
	In the second quarter of 2013, we made changes to our retirement plans in order to better plan and manage related expenses which have a significant and variable impact on earnings. Effective June 30, 2013, for salaried and non-union hourly employees in the U.S. and effective December 31, 2013 for union employees in the U.S., benefits under our defined benefit pension plans will no longer accrue. The freeze of the defined benefit pension plan for salaried and non-union hourly employees was approved by the Board of Directors on May 3, 2013. The freeze of the union employees' defined benefit pension plan was approved upon ratification of the labor agreement on April 14, 2013. These changes resulted in a remeasurement event requiring us to remeasure the plan asset and liabilities, as well as the expense related to the plans, as of April 30, 2013. This date was considered the accounting date, per the related accounting guidance, as it was reasonably close to the approval dates of these changes for both the union and salaried plans.
	(Dollars in thousands)	Pension Benefits								Retirement Health and Life Insurance Benefits
	Change in benefit obligation:	2014			2013					2014			2013
	Benefit obligation at beginning of year	$	174,325		$	209,844				$	10,824		$	11,891
	Service cost	—			2,473					556			627
	Interest cost	8,015			7,753					305			262
	Actuarial (gain) loss	34,006			(15,834		)			(1,071		)	(1,205		)
	Benefit payments	(24,934		)	(7,276		)			(775		)	(751		)
	Settlement charge	—			—					—			—
	Special termination benefit	(3,530		)	(22,635		)			—			—
	Benefit obligation at end of year	$	187,882		$	174,325				$	9,839		$	10,824
	Change in plan assets:	2014			2013					2014			2013
	Fair value of plan assets at the beginning of the year	$	171,218		$	143,540				$	—		$	—
	Actual return on plan assets	10,445			21,954					—			—
	Employer contributions	13,871			13,000					775			751
	Benefit payments	(24,934		)	(7,276		)			(775		)	(751		)
	Fair value of plan assets at the end of the year	170,600			171,218					—			—
	Funded status	$	(17,282	)	$	(3,107	)			$	(9,839	)	$	(10,824	)
	Amounts recognized in the consolidated statements of financial position consist of:
	(Dollars in thousands)	Pension Benefits								Retirement Health and Life Insurance Benefits
		2014			2013					2014			2013
	Noncurrent assets	$	404		$	2,983				$	—		$	—
	Current liabilities	(34		)	(654		)			(1,071		)	(1,175		)
	Noncurrent liabilities	(17,652		)	(5,436		)			(8,768		)	(9,649		)
	Net amount recognized at end of year	$	(17,282	)	$	(3,107	)			$	(9,839	)	$	(10,824	)
	(Dollars in thousands)	Pension Benefits				Retirement Health and Life Insurance Benefits
		2014				2014
	Net actuarial loss	$	62,053			$	707
	Prior service cost	—				—
	Net amount recognized at end of year	$	62,053			$	707
	The projected benefit obligation, accumulated benefit obligation, and fair value of plan assets for the pension plans with an accumulated benefit obligation in excess of plan assets were $155.2 million, $155.2 million and $137.6 million, respectively, as of December 31, 2014 and $144.3 million, $144.3 million and $138.2 million, respectively, as of December 31, 2013.
	The projected benefit obligation, accumulated benefit obligation, and fair value of plan assets for the pension plans with plan assets in excess of an accumulated benefit obligation were $32.6 million, $32.6 million and $33.0 million, respectively, as of December 31, 2014. For 2013, the projected benefit obligation, accumulated benefit obligation, and fair value of plan assets for the pension plans with plan assets in excess of an accumulated benefit obligation were 30.0 million, 30.0 million, and 33.0 million, respectively.
	Components of Net Periodic Benefit Cost
	(Dollars in thousands)	Pension Benefits													Postretirement Health and Life Insurance Benefits
		2014				2013				2012					2014		2013			2012
	Service cost	$	—			$	2,473			$	4,596				$	556	$	627		$	630
	Interest cost	8,015				7,753				8,420					305		262			364
	Expected return of plan assets	(12,909		)		(11,247		)		(9,892		)			—		—			—
	Amortization of prior service cost	—				124				463					—		(230		)	(451		)
	Amortization of net loss	686				3,615				5,471					—		204			313
	Settlement charge/(credit)	5,321				—				2,073					—		—			—
	Special termination benefit	—				—				—					—		—			1,592
	Curtailment charge	—				1,537				—					—		—			—
	Net periodic benefit cost	$	1,113			$	4,255			$	11,131				$	861	$	863		$	2,448
	In the first quarter of 2012, we implemented an early retirement program for certain eligible employees. As a result of this program, we incurred $1.6 million in charges in 2012 related to a special termination benefit associated with the retirement health and life insurance benefits program, as we extended eligibility benefits to certain individuals who chose to participate in the program.
	Early in the third quarter of 2012, we made a one-time cash payment to our former President and Chief Executive Officer of approximately $6.3 million in accordance with the provisions of his retirement contract as part of his Pension Restoration Plan. This payment resulted in a settlement charge of approximately $2.1 million, which was recognized in the third quarter of 2012.
	In the second quarter of 2013, the decision to freeze the accruing of benefits in the defined benefit pension plans resulted in a curtailment charge of $1.5 million.
	In the fourth quarter of 2014, certain eligible participants in the defined benefit pension plans were given a lump sum payout offer. The payout of this program resulted in a settlement charge of $5.2 million.
	The estimated net loss for the defined benefit pension plans that will be amortized from other comprehensive income into net periodic benefit cost over the next fiscal year is $1.7 million. The estimated net loss (gain) for the defined benefit postretirement plans that will be amortized from other comprehensive income into net periodic benefit cost over the next fiscal year is $0.0 million.
	Weighted-average assumptions used to determine benefit obligations at December 31:
		Pension Benefits						Retirement Health and Life Insurance Benefits
		2014		2013				2014		2013
	Discount rate	4	%	4.75	%			3	%	3.25	%
	Expected long-term rate of return on plan assets	6.5	%	7.5	%			—		—
	Weighted-average assumptions used to determine net benefit cost for the years ended:
		Pension Benefits						Retirement Health and Life Insurance Benefits
		2014		2013				2014		2013
	Discount rate	4.75	%	4	%			3.25	%	2.5	%
	Expected long-term rate of return on plan assets	7.5	%	7.5	%			—		—
Rate of compensation increase	4	%	4	%			—		—
Long-term rate of return on assets - To determine the expected long-term rate of return on plan assets, we review historical and projected portfolio performance, the historical long-term rate of return, and how any change in the allocation of the assets could affect the anticipated returns. Adjustments are made to the projected rate of return if it is deemed necessary based on those factors and other current market trends.
Discount rate - To determine the discount rate, we review current market indices of high quality corporate bonds, particularly the PruCurve index, to ensure that the rate used in our calculations is consistent and within an acceptable range based on these indices, which reflect current market conditions. The market-based rates are modified to be Rogers-specific, and this is done by applying our pension benefit cash flow projections to the generic index rate. At December 31, 2014, this analysis resulted in a 75 basis point decrease to the discount rate which went from 4.75% at December 31, 2013 to 4.00% at December 31, 2014.
Health care cost trend rates - For measurement purposes as of December 31, 2014 we assumed annual health care cost trend rates of 7.50% and 7.50% for covered health care benefits for retirees pre-age 65 and post-age 65, respectively. The rates were assumed to decrease gradually by 0.5% annually until reaching 4.50% and 4.50%, respectively, and remain at those levels thereafter. For measurement purposes as of December 31, 2013, we assumed annual health care cost trend rates of 8.00% and 8.00% for covered health care benefits for retirees pre-age 65 and post-age 65, respectively. Assumed health care cost trend rates have a significant effect on the amounts reported for the health care plans. A one-percentage point change in assumed health care cost trend rates would have the following effects:
(Dollars in thousands)	One Percentage Point
	Increase				Decrease
Effect on total service and interest cost	$	60			$	527
Effect on other postretirement benefit obligations	(55		)		(495		)
Plan Assets
Our defined benefit pension assets are invested with the objective of achieving a total rate of return over the long-term that is sufficient to fund future pension obligations. In managing these assets and our investment strategy, we take into consideration future cash contributions to the plans, as well as the potential of the portfolio underperforming the market, which is partially mitigated by maintaining a diversified portfolio of assets.
In order to meet our investment objectives, we set asset allocation target ranges based on current funding status and future projections in order to mitigate the risk in the plan while maintaining its funded status. During 2014 we implemented pension risk reduction steps related to our investments, which included a change in our asset mix to hold a larger amount of fixed income securities. At December 31, 2014, we held approximately 23% equity securities and 77% fixed income securities in our portfolio, which is a significant shift from our allocation at December 31, 2013 of 60% equity and 40% fixed income.
In determining our investment strategy and calculating our plan liability and related expense, we utilize an expected long-term rate of return on plan assets. This rate is developed based on several factors, including the plans' asset allocation targets, the historical and projected performance on those asset classes, and on the plans' current asset composition. To justify our assumptions, we analyze certain data points related to portfolio performance. For example, we analyze the actual historical performance of our total plan assets, which has generated a return of approximately 8.2% over the past 19 year period (earliest data available for our analysis was 1996). Also, we analyze hypothetical rates of return for plan assets based on our current asset allocation mix, which we estimate would have generated a return of approximately, 7.5% over the last 20 years and 7.0% over the last 10 years. Additionally, we analyzed the potential return associated with our portfolio mix and determined it to be a projected return of 4.5% to 7.5% for the 25th to 75th percentile of assets, with a average return of 6.5%. Based on the historical returns and the projected future returns we determined that a target return of 6.5% is appropriate for the current portfolio.
Investments are stated at fair value. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (an exit price).
Securities traded on a national securities exchange are valued at the last reported sales price on the last business day of the plan year. The fair value of the guaranteed deposit account is determined through discounting expected future investment cash flow from both investment income and repayment of principal for each investment purchased.
The estimated fair values of the participation units owned by the plan in pooled separate accounts are based on quoted redemption values and adjusted for management fees and asset charges, as determined by the record keeper, on the last business day of the Plan year. Pooled separate accounts are accounts established solely for the purpose of investing the assets of one or more plans. Funds in a separate account are not commingled with other assets of the Company for investment purposes.
The following table presents the fair value of the net assets by asset category at December 31, 2014 and 2013:
(Dollars in thousands)	2014				2013
Pooled separate accounts	$	5,204			$	38,584
Fixed income bonds	102,535				—
Mutual funds	51,097				119,277
Guaranteed deposit account	11,764				13,357
Total investments at fair value	$	170,600			$	171,218
The following tables set forth by level, within the fair value hierarchy, the assets carried at fair value as of December 31, 2014 and 2013.
	Assets at Fair Value as of December 31, 2014
(Dollars in thousands)	Level 1				Level 2				Level 3				Total
Pooled separate accounts	$	—			$	5,204			$	—			$	5,204
Fixed income bonds	—				102,535				—				102,535
Mutual funds	51,097				—				—				51,097
Guaranteed deposit account	—				—				11,764				11,764
Total assets at fair value	$	51,097			$	107,739			$	11,764			$	170,600
	Assets at Fair Value as of December 31, 2013
(Dollars in thousands)	Level 1				Level 2				Level 3				Total
Pooled separate accounts	$	—			$	38,584			$	—			$	38,584
Mutual funds	119,277				—				—				119,277
Guaranteed deposit account	—				—				13,357				13,357
Total assets at fair value	$	119,277			$	38,584			$	13,357			$	171,218
The table below sets forth a summary of changes in the fair value of the guaranteed deposit account's Level 3 assets for the year ended December 31, 2014.
(Dollars in thousands)	Guaranteed Deposit Account
Balance at beginning of year	$	13,357
Realized gains (losses)	—
Unrealized gains relating to instruments still held at the reporting date	785
Purchases, sales, issuances and settlements (net)	(2,378		)
Transfers in and/or out of Level 3	—
Balance at end of year	$	11,764
Cash Flows
Contributions
At December 31, 2014, we have met the minimum funding requirements for our qualified defined benefit pension plans and were therefore not required to make a contribution to the plans in 2014 for any past years. In 2014 and 2013, we made voluntary contributions of $13.0 million and $13.0 million, respectively. As there is no funding requirement for the nonqualified defined benefit pension plans and the Retiree Health and Life Insurance benefit plans, we fund the amount of benefit payments made during the year, which is consistent with past practices. We currently estimate that we will make voluntary contributions of approximately $10.0 million in 2015 towards our qualified defined benefit pension plans.
Estimated Future Payments
The following pension benefit payments, which reflect expected future employee service, as appropriate, are expected to be paid through the utilization of plan assets for the funded plans and from operating cash flows for the unfunded plans. The Retiree Health and Life Insurance benefits, for which no funding has been made, are expected to be paid from operating cash flows. The benefit payments are based on the same assumptions used to measure our benefit obligation at the end of fiscal 2014.
	Pension Benefits				Retiree Health and Life Insurance Benefits
2015	$	8,126			$	1,071
2016	$	8,125			$	1,052
2017	$	8,355			$	1,017
2018	$	8,621			$	994
2019	$	8,944			$	1,038
2020-2024	$	50,043			$	5,839

Employee_Savings_and_Investmen

Employee Savings and Investment Plan	12 Months Ended
	Dec. 31, 2014
Compensation Related Costs [Abstract]
Employee Savings and Investment Plan	EMPLOYEE SAVINGS AND INVESTMENT PLAN
	We sponsor the Rogers Employee Savings and Investment Plan (RESIP), a 401(k) plan for domestic employees. Employees can defer an amount they choose, up to the yearly IRS limit of $17,500 in 2014 and $17,500 in 2013. Certain eligible participants are also allowed to contribute the maximum catch-up contribution per IRS regulations. Our matching contribution is 6% of an eligible employee’s annual pre-tax contribution at a rate of 100% for the first 1% and 50% for the next 5% for a total match of 3.5%. Unless otherwise indicated by the participant, the matching dollars are invested in the same funds as the participant’s contributions. RESIP related expense amounted to $2.7 million in 2014, $2.1 million in 2013 and $1.7 million in 2012, which related solely to our matching contributions.

Debt

Debt	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Debt	DEBT
	On July 13, 2011, we entered into an amended and restated $265.0 million secured five year credit agreement, which we amended in March 2012. This credit agreement (“Amended Credit Agreement”) is with (i) JPMorgan Chase Bank, N.A., as administrative agent; (ii) HSBC Bank USA, National Association; (iii) RBS Citizens, National Association; (iv) Fifth Third Bank; and (v) Citibank, N.A.  JPMorgan Securities LLC and HSBC Bank USA, National Association acted as joint bookrunners and joint lead arrangers; HSBC Bank USA, National Association and RBS Citizens, National Association acted as co-syndication agents; and Fifth Third Bank and Citibank, N.A. acted as co-documentation agents. The Amended Credit Agreement amends and restates the credit agreement signed between the Company and the same banks on November 23, 2010 and increased our borrowing capacity from $165.0 million under the original agreement to $265.0 million under the Amended Credit Agreement.
	Key features of the Amended Credit Agreement, as compared to the November 23, 2010 credit agreement, include an increase in credit from $165.0 million to $265.0 million with the addition of a $100.0 million term loan; the extension of maturity from November 23, 2014 to July 13, 2016; a 25 basis point reduction in interest costs; an increase in the size of permitted acquisitions from $25.0 million to $100.0 million; and an increase in permitted additional indebtedness from $20.0 million to $120.0 million.
	The Amended Credit Agreement provided for the extension of credit in the form of a $100.0 million term loan (which refinanced outstanding borrowings in the amount of $100.0 million from the existing revolving credit line), as further described below; and up to $165.0 million of revolving loans, in multiple currencies, at any time and from time to time until the maturity of the Amended Credit Agreement on July 13, 2016. We may borrow, pre-pay and re-borrow amounts under the $165.0 million revolving portion of the Amended Credit Agreement; however, with respect to the $100.0 million term loan portion, any principal amounts re-paid may not be re-borrowed. 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 Amended Credit Agreement).
	Borrowings under the Amended Credit Agreement bear interest based on one of two options. Alternate base rate loans bear interest that includes a base reference rate plus a spread of 75 - 150 basis points, depending on our leverage ratio. The base reference rate is the greater of the prime rate; federal funds effective rate plus 50 basis points; and adjusted London interbank offered (“LIBO”) rate plus 100 basis points. Euro-currency loans bear interest based on the adjusted LIBOR plus a spread of 175 - 250 basis points, depending on our leverage ratio. Our current borrowings are Euro-currency based.
	In addition to interest payable on the principal amount of indebtedness outstanding from time to time under the Amended Credit Agreement, the Company is required to pay a quarterly fee of 0.20% to 0.35% (based upon its leverage ratio) on the unused amount of the lenders’ commitments under the Amended Credit Agreement.
	In connection with the Amended Credit Agreement, we transferred borrowings in the amount of $100.0 million from the revolving credit line under the November 23, 2010 credit agreement to the term loan under the Amended Credit Agreement. The Amended Credit Agreement requires the mandatory quarterly repayment of principal on amounts borrowed under such term loan. Payments commenced on September 30, 2011, and are scheduled to be completed on June 30, 2016. The future principal payments under the Amended Credit Agreement are as follows:
	2014	$17.50	million
	2015	$35.00	million
	2016	$25.00	million
	The Amended Credit Agreement is secured by many of the assets of Rogers and our World Properties, Inc., subsidiary, including but not limited to, receivables, equipment, intellectual property, inventory, stock in certain subsidiaries and real property.
	As part of the Amended Credit Agreement, we are restricted in our ability to perform certain actions, including, but not limited to, our ability to pay dividends, incur additional debt, sell certain assets, and make capital expenditures, with certain exceptions. Further, we are required to maintain certain financial covenant ratios, including (i) a leverage ratio of no more than 3.0 to 1.0 and (ii) a minimum fixed charge coverage ratio (FCCR) as defined in the following table:
	Period	Ratio
	March 31, 2013 to December 31, 2013	1.50 : 1.00
	March 31, 2014 and thereafter	1.75 : 1.00
	The FCCR is the ratio between Adjusted Earnings Before Interest Taxes Depreciation and Amortization (EBITDA) and Consolidated Fixed Charges as defined in the Amended Credit Agreement, which measures our ability to cover the fixed charge obligations. The key components of Consolidated Fixed Charges are capital expenditures, scheduled debt payments, capital lease payments, rent and interest expenses. Several factors in the first quarter of 2012, including the status of the global economy and the fact that there were no mandatory term loan payments when the original ratio was established, led to an amendment to the covenant which temporarily reduced the FCCR.
	Relevant Fixed Charge metrics are detailed in the table below:
	Periods	Q4 2013		Q1 2014	Q2 2014	Q3 2014	Q4 2014
	Covenant Limit (minimum)	1.5		1.75	1.75	1.75	1.75
	Actual FCCR	2.39		2.69	2.65	2.7	2.58
	As of December 31, 2014, we were in compliance with all of our covenants, as we achieved actual ratios of approximately 0.55 on the leverage ratio and 2.58 on the fixed charge coverage ratio.
	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.
	In connection with the establishment of the initial credit agreement in 2010, we capitalized approximately $1.6 million of debt issuance costs. We capitalized an additional $0.7 million of debt issuance costs in 2011 related to the Amended Credit Agreement. Also, in connection with the Amended Credit Agreement, we capitalized an additional $0.1 million of debt issuance costs in 2012. These costs will be amortized over the life of the Amended Credit Agreement, which will terminate in June 2016.
	We incurred amortization expense of $0.5 million in 2014, 2013 and 2012. At December 31, 2014, we have approximately $0.8 million of credit facility costs remaining to be amortized.
	In the first quarter of 2011, we made an initial draw on the line of credit under the November 23, 2011 credit agreement of $145.0 million to fund the acquisition of Curamik. During 2014 and 2013, we made principal payments of $17.5 million and $20.5 million, respectively, on the outstanding debt. The 2013 payments included an $8.0 million payment on the revolving credit line, which paid the remaining balance of the revolving credit line.
	We are obligated to pay $35.0 million on this debt obligation in 2015. As of December 31, 2014, the outstanding debt related to the Amended Credit Agreement, consists of $60.0 million of term loan debt. We have the option to pay part of or the entire amount at any time over the remaining life of the Amended Credit Agreement, with any balance due and payable at the agreement's expiration.
	In addition, as of December 31, 2014, we had a $1.4 million standby letter of credit (LOC) to guarantee Rogers workers compensation plans that was backed by the Amended Credit Agreement. No amounts were owed on the standby LOC as of December 31, 2014 or December 31, 2013.
	We also guarantee an interest rate swap related to the lease of the Curamik manufacturing facility in Eschenbach, Germany. The swap agreement is between the lessor, our Curamik subsidiary and a third party bank. We guarantee any liability related to the swap agreement in case of default by the lessor through the term of the swap until expiration in July 2016, or if we exercised the option to buy out the lease at June 30, 2013 as specified within the lease agreement. We did not exercise our option to buy out the lease at June 30, 2013. The swap is in a liability position with the bank at December 31, 2014, and has a fair value of $0.4 million. We have concluded that default by the lessor is not probable during the term of the swap; therefore, the guarantee has no value and no amount has been recorded on our consolidated statements of financial position.
	Capital Lease
	During the first quarter of 2011, we recorded a capital lease obligation related to the acquisition of Curamik for its primary manufacturing facility in Eschenbach, Germany. Under the terms of the leasing agreement, we had an option to purchase the property in either 2013 or 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. We chose not to exercise the option to purchase the property that was available to us on June 30, 2013. The total obligation recorded for the lease as of December 31, 2014 and 2013 was $6.8 million and $8.0 million, respectively. Depreciation expense related to the capital lease was $0.4 million, $0.4 million and $0.4 million for the years ending December 31, 2014, 2013 and 2012, respectively. Accumulated depreciation as of December 31, 2014 and 2013 was $1.6 million and $1.2 million, respectively.
	These expenses are included as depreciation expense in Cost of Sales on our consolidated statements of income (loss). Interest expense related to the debt recorded on the capital lease is included in interest expense on the consolidated statements of income (loss). See “Interest” section below for further discussion.
	Interest
	We incurred interest expense on our outstanding debt of $1.8 million, $2.2 million and $2.9 million for the years ended December 31, 2014, 2013 and 2012, respectively. We incurred an unused commitment fee of $0.4 million, $0.5 million, and $0.4 million for the years ended December 31, 2014, 2013, and 2012, respectively. In July 2012, we entered into an interest rate swap to hedge the variable interest rate on 65% of the term loan debt then outstanding, effective July 2013. At December 31, 2014, our outstanding debt balance is comprised of a term loan debt, which is $60.0 million. At December 31, 2014, the rate charged on this debt is the 1 month LIBOR at 0.1875% plus a spread of 1.75%.
	We also incurred interest expense on the capital lease of $0.5 million, $0.5 million and $0.6 million for the years ended December 31, 2014, 2013 and 2012, respectively. Cash paid for interest was $2.5 million, $3.1 million and $4.0 million for 2014, 2013 and 2012, respectively.
	Restriction on Payment of Dividends
	Pursuant to the Amended Credit Agreement, we cannot make a cash dividend payment if a default or event of default has occurred and is continuing or shall result from the cash dividend payment.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES
	Consolidated income (loss) from continuing operations before income taxes consists of:
	(Dollars in thousands)	2014			2013			2012
	Domestic	$	61,446		$	13,208		$	6,260
	International	18,964			35,677			16,390
	Total	$	80,410		$	48,885		$	22,650
	The income tax expense (benefit) in the consolidated statements of income (loss) consists of:
	(Dollars in thousands)	Current			Deferred			Total
	2014
	Domestic	$	2,205		$	6,699		$	8,904
	International	17,172			1,451			18,623
	Total	$	19,377		$	8,150		$	27,527
	2013
	Domestic	$	(7,075	)	$	5,894		$	(1,181	)
	International	12,667			(260		)	12,407
	Total	$	5,592		$	5,634		$	11,226
	2012
	Domestic	$	3,651		$	(59,414	)	$	(55,763	)
	International	8,118			1,161			9,279
	Total	$	11,769		$	(58,253	)	$	(46,484	)
	Deferred tax assets and liabilities as of December 31, 2014 and 2013, were comprised of the following:
	(Dollars in thousands)
		2014			2013
	Deferred tax assets
	Accrued employee benefits and compensation	$	9,168		$	9,350
	Postretirement benefit obligations	7,866			2,860
	Tax loss and credit carryforwards	16,533			15,041
	Reserves and accruals	7,092			6,908
	Depreciation and amortization	17,862			21,496
	Other	2,550			3,772
	Total deferred tax assets	61,071			59,427
	Less deferred tax asset valuation allowance	(7,691		)	(7,302		)
	Total deferred tax assets, net of valuation allowance	53,380			52,125
	Deferred tax liabilities
	Investment in joint ventures, net	—			—
	Depreciation and amortization	14,303			15,839
	Other	344			238
	Total deferred tax liabilities	14,647			16,077
	Net deferred tax asset	$	38,733		$	36,048
	We have a $0.7 million net operating loss carryforward in China which will expire in 2018. We have a 0.1 million net operating loss carryforward in Japan, which will expire in 2023. We also have state net operating loss carryforwards ranging from $0.1 million to $16.2 million in various state taxing jurisdictions, which will begin to expire in 2015. We have approximately $7.0 million of credit carryforwards in Arizona, which will expire in 2015. We believe that it is more likely than not that the benefit from the China and state net operating loss carryforwards as well as our state credit carryforwards will not be realized. In recognition of this risk, we have provided a valuation allowance of $7.7 million relating to these carryforwards. If or when recognized, the tax benefits related to any reversal of the valuation allowance on deferred tax assets as of December 31, 2014, will be accounted for as follows: approximately $6.8 million will be recognized as a reduction of income tax expense and $0.9 million will be recorded as an increase in equity.
	We currently have approximately $15.5 million of foreign tax credits that begin to expire in 2021, $5.2 million of research and development credits that begin to expire in 2026, and $0.5 million of minimum tax credits that can be carried forward indefinitely.
	As a result of certain realization requirements, the table of deferred tax assets and liabilities shown above does not include certain deferred tax assets as of December 31, 2014 for which the benefit thereof was postponed by tax deductions related to equity compensation in excess of compensation recognized for financial reporting. Those deferred tax assets include foreign tax credits of $8.6 million, research and development credits of $1.2 million and minimum tax credits of $0.4 million. Equity will be increased by these amounts if and when such deferred tax assets are ultimately realized.
	We had a valuation allowance of $7.7 million at December 31, 2014 and $7.3 million at December 31, 2013, against certain of our deferred tax assets. In making this determination, we assess the available positive and negative evidence to estimate if sufficient future taxable income will be generated to use the existing deferred tax assets. A significant piece of objective negative evidence evaluated was the cumulative loss incurred over the three-year period ended December 31, 2014 for state tax purposes only. Due to differences in our reporting group for federal and state tax purposes, we are in a cumulative income position for US federal tax purposes at December 31, 2014. The amount of the deferred tax asset considered realizable, however, could be adjusted if estimates of future taxable income during the carryforward period are reduced or increased or if objective negative evidence in the form of cumulative losses is no longer present and additional weight may be given to subjective evidence such as our projections for growth.
	In 2009, we were in a cumulative loss for both federal and state tax purposes. Accordingly, we placed a valuation allowance against substantially all of our U.S. deferred tax assets as we concluded that we did not have sufficient evidence to rebut this negative evidence. At the end of the third quarter of 2012, we released the valuation allowance placed against our U.S. federal deferred tax assets as we concluded that a valuation allowance against these assets was longer no necessary as we were no longer in, nor were we expecting to be in, a cumulative loss for our U.S. federal tax reporting group for the foreseeable future. As we were no longer in a cumulative loss position we should have been able to rely on forecasted U.S. profits as a source of taxable income. Also, in appropriate circumstances we have the opportunity to undertake a tax planning strategy to ensure that our tax credit carryforwards do not expire unutilized. This strategy is based upon our ability to make a tax election to capitalize certain expenses that will result in generating taxable income to allow us to utilize our tax credit carryforwards before they expire. We would undertake such a strategy to realize these tax credit carryforwards prior to expiration as it is reasonable, prudent, and feasible. This, along with other positive evidence, such as our recent history of positive taxable income, led us to conclude in 2012 that it is more likely than not that we will ultimately be able to realize our U.S. federal deferred tax assets.
	Also in 2012, we realized a capital loss on the sale of the auction rate securities. As we do not have the ability to generate capital gains in the near future, we have established a valuation allowance against this deferred tax asset.
	Income tax expense differs from the amount computed by applying the United States federal statutory income tax rate to income before income taxes. The reasons for this difference are as follows:
	(Dollars in thousands)	2014			2013			2012
	Tax expense at Federal statutory income tax rate	$	28,144		$	17,110		$	7,928
	International tax rate differential	(6,772		)	(2,541		)	(209		)
	Foreign source income, net of tax credits	5,195			(786		)	(3,428		)
	Unrecognized tax benefits	603			(2,197		)	1,604
	General business credits	(604		)	(702		)	—
	Acquisition related expenses	590			—			—
	Valuation allowance change	388			—			(52,650		)
	Other	(17		)	342			271
	Income tax expense (benefit)	$	27,527		$	11,226		$	(46,484	)
	The objective of accounting for income taxes is to recognize the amount of taxes payable or refundable for the current year and the deferred tax liabilities and assets for the future tax consequence of events that have been recognized in the entity's financial statements. We are subject to income taxes in the United States and in numerous foreign jurisdictions. We consider the undistributed earnings as of December 31, 2014, of substantially all of our foreign subsidiaries to be indefinitely reinvested and, accordingly, no U.S. income taxes have been provided thereon. If circumstances change and it becomes apparent that some, or all of the undistributed earnings as of December 31, 2014 will not be indefinitely reinvested, the provision for the tax consequence, if any, will be recorded in the period when circumstances change. During 2014, a distribution out of current year profits was made that resulted in an increase in tax of $4.7 million. At December 31, 2014 and 2013, we have not accrued U.S. income taxes on unremitted earnings of approximately $169.0 million and $172.9 million, respectively.
	Income taxes paid, net of refunds, were $14.5 million, $11.1 million, and $11.6 million, in 2014, 2013, and 2012, respectively.
	A reconciliation of unrecognized tax benefits, excluding potential interest and penalties, for the years ending December 31, 2014 and December 31, 2013, is as follows:
	(Dollars in thousands)
		2014			2013
	Beginning balance	$	9,148		$	17,333
	Gross increases - current period tax positions	1,763			1,445
	Gross increases - tax positions in prior periods	335			—
Gross decreases - tax positions in prior periods	—			(7,136		)
Foreign currency exchange	(230		)	79
Lapse of statute of limitations	(1,648		)	(2,573		)
Ending balance	$	9,368		$	9,148
Included in the balance of unrecognized tax benefits as of December 31, 2014 are $9.4 million of tax benefits that, if recognized, would affect the effective tax rate. Also included in the balance of unrecognized tax benefit as of December 31, 2014 are $0.1 million of tax benefits that, if recognized, would result in adjustments to other tax accounts; primarily deferred taxes.
We recognize interest accrued related to unrecognized tax benefit as income tax expense. Related to the unrecognized tax benefits noted above, at December 31, 2014 and 2013, we had accrued potential interest and penalties of approximately $1.2 million and $1.1 million, respectively. It is possible that up to $3.9 million of our currently unrecognized tax benefits could be recognized within 12 months as a result of projected resolutions of worldwide tax disputes or the expiration of the statute of limitations.
We are subject to taxation in the U.S. and various state and foreign jurisdictions. Our tax years from 2011 through 2014 are subject to examination by the tax authorities. With few exceptions, we are no longer subject to U.S. federal, state, local and foreign examinations by tax authorities for the years before 2011.

Shareholders_Equity_and_Stock_

Shareholders' Equity and Stock Options	12 Months Ended
	Dec. 31, 2014
Share-based Compensation [Abstract]
Shareholders Equity and Stock Options	SHAREHOLDERS' EQUITY AND STOCK OPTIONS
	Capital Stock and Equity Compensation Awards
	Under the Rogers Corporation 2009 Long-Term Equity Compensation Plan, we may grant stock options to officers, directors, and other key employees at exercise prices that are at least equal to the fair market value of our stock on the date of grant. Under our older plans, stock options to officers, directors, and other key employees could be granted at exercise prices that were as low as 50% of the fair market value of our stock as of the date of grant. However, in terms of these older plans, virtually all such options were granted at exercise prices equal to the fair market value of our stock as of the date of grant. With shareholder approval of the Rogers Corporation 2009 Long-Term Equity Compensation Plan, no new equity awards will be granted from our older plans. Regular options granted to employees in the United States generally become exercisable over a four-year period from the grant date and expire ten years after such grant. Stock option grants were also made under the older plans to non-management directors, on a semi-annual basis, with the last of such grants being made in June 2008.
	Beginning in December 2008, each non-management director was awarded deferred stock units instead of stock options. Such deferred stock units permit non-management directors to receive, at a later date, one share of Rogers stock for each deferred stock unit with no payment of any consideration by the director at the time the shares are received. For director stock options, the exercise price was equal to the fair market value of our stock as of the grant date, are immediately exercisable, and expire ten years after the date of grant. Our 2005 Equity Compensation Plan and our 2009 Long-Term Equity Compensation Plan also permit the granting of restricted stock and certain other forms of equity awards to officers and other key employees, although, as mentioned above, no new equity awards are being made pursuant to the 2005 plan. Stock grants in lieu of cash compensation are also made to non-management directors and the Stock Acquisition Program, approved in 2009, is now being used for such grants if a non-management director chooses to receive Rogers stock in lieu of cash compensation.
	Bruce D. Hoechner, President and Chief Executive Officer, was granted three equity awards when he joined Rogers as our new President and Chief Executive Officer in October of 2011. This consisted of two time-based restricted stock unit awards with different vesting schedules and a non-qualified stock option award. The Board of Directors (including a majority of its independent directors) approved these equity inducement awards in reliance on an employment inducement exception to shareholder approval provided for in the New York Stock Exchange governance rules.
	Shares of capital stock reserved for possible future issuance are as follows:
		31-Dec-14			31-Dec-13
	Stock acquisition program	120,883			120,883
	Stock options and restricted stock	862,040			1,328,414
	Shares available for issuance	1,176,882			479,307
	Rogers Employee Savings and Investment Plan	169,044			169,044
	Rogers Corporation Global Stock Ownership Plan for Employees	166,152			181,617
	Deferred compensation to be paid in stock	13,248			14,558
	Total	2,508,249			2,293,823
	Each outstanding share of Rogers capital (common) stock has attached to it a stock purchase right. One stock purchase right entitles the holder to buy one share of Rogers capital (common) stock at an exercise price of $240.00 per share. The rights become exercisable only under certain circumstances related to a person or group acquiring or offering to acquire a substantial block of Rogers capital (common) stock. In certain circumstances, holders may acquire Rogers stock, or in some cases the stock of an acquiring entity, with a value equal to twice the exercise price. The rights expire on March 30, 2017, but may be exchanged or redeemed earlier. If such rights are redeemed, the redemption price would be $0.01 per right.
	Stock Options
	Stock options have been granted under various equity compensation plans. While we may grant options to employees that become exercisable at different times or within different periods, we have generally granted options to employees that vest and become exercisable in one-third increments on the second, third and fourth anniversaries of the grant dates. The maximum contractual term for all options is normally ten years.
	We use the Black-Scholes option-pricing model to calculate the grant-date fair value of an option. We have not granted any stock options since the first quarter of 2012.
			December 31,
			2012
	Options granted		46,950
	Weighted average exercise price		$	41.27
	Weighted-average grant date fair value		19.08
	Assumptions:
	Expected volatility		47.7		%
	Expected term (in years)		5.9
	Risk-free interest rate		1.43		%
	Expected dividend yield		—
	Expected volatility – In determining expected volatility, we have considered a number of factors, including historical volatility and implied volatility.
	Expected term – We use historical employee exercise data to estimate the expected term assumption for the Black-Scholes valuation.
	Risk-free interest rate – We use the yield on zero-coupon U.S. Treasury securities for a period commensurate with the expected term assumption as the risk-free interest rate.
	Expected dividend yield – We do not currently pay dividends on our common stock; therefore, a dividend yield of 0% was used in the Black-Scholes model.
	In most cases, we recognize expense using the straight-line attribution method for stock option grants. The amount of stock-based compensation recognized during a period is based on the value of the portion of the awards that are ultimately expected to vest. Forfeitures are required to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. The term “forfeitures” is distinct from “cancellations” or “expirations” and represents only the unvested portion of the surrendered option. We currently expect, based on an analysis of our historical forfeitures, an annual forfeiture rate of approximately 3% and applied that rate to the grants issued. This assumption will be reviewed periodically and the rate will be adjusted as necessary based on these reviews. Ultimately, the actual expense recognized over the vesting period will only be for those options that vest.
	Our employee stock option agreements contain a retirement provision, which results in the vesting of any unvested options immediately upon retirement. This provision affects the timing of option expense recognition for options meeting the criteria for retirement. We recognize compensation expense over the period from the date of grant to the date retirement eligibility is met, if it is shorter than the required service period, or upon grant if the employee is eligible for retirement on that date.
	A summary of the activity under our stock option plans as of December 31, 2014 and changes during the year then ended, is presented below:
		Options Outstanding			Weighted- Average Exercise Price Per Share		Weighted-Average Remaining Contractual Life in Years		Aggregate Intrinsic Value
	Options outstanding at December 31, 2013	893,139			$	43.23	3.9		16,403,816
	Options granted	—			—
	Options exercised	(476,793	)		44.6
	Options cancelled	(22,999	)		57.07
	Options outstanding at December 31, 2014	393,347			40.72		3.8		16,019,130
	Options exercisable at December 31, 2014	364,770			40.13		3.4		15,069,704
	Options vested at December 31, 2014 or expected to vest*	392,490			40.7		3.8		15,990,648
	* In addition to the vested options, we expect a portion of the unvested options to vest at some point in the future. Options expected to vest are calculated by applying an estimated forfeiture rate to the unvested options.
	During the years ended December 31, 2014 and 2013, 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 $9.4 million and $13.6 million, respectively. The total amount of cash received from the exercise of these options was $20.5 million and $32.4 million, respectively. The total grant-date fair value of stock options that vested during the years ended December 31, 2014 and 2013 was approximately $0.3 million and $0.4 million, respectively.
	As of December 31, 2014, there was $0.2 million of total unrecognized compensation cost related to unvested stock option awards. That cost is expected to be recognized over a weighted-average period of 1.0 years.
	We recognized $0.3 million, $0.4 million and $2.0 million of compensation expense related to stock options for the years ended December 31, 2014, 2013 and 2012, respectively.
	A summary of the activity under our stock option plans for the fiscal years ended 2014, 2013 and 2012, is presented below:
		2014					2013					2012
					Weighted-					Weighted-				Weighted-
					Average					Average				Average
		Options			Exercise Price		Options			Exercise Price		Options		Exercise Price
		Outstanding			Per Share		Outstanding			Per Share		Outstanding		Per Share
	Outstanding at beginning of year	893,139			$	43.23	1,765,947			$	40.58	2,401,809		$	37.54
	Options granted	—			—		—			—		46,950		41.27
	Options exercised	(476,793	)		44.6		(847,340	)		37.82		(614,263	)	42.97
	Options cancelled	(22,999	)		57.07		(25,468	)		39.04		(68,549	)	43.57
	Outstanding at year-end	393,347			40.72		893,139			43.23		1,765,947		40.58
	Options exercisable at year-end	364,770					721,645					1,274,340
	Performance-Based Restricted Stock
	In 2006, we began granting performance-based restricted stock awards to certain key executives. We currently have awards from 2012, 2013 and 2014 outstanding. These awards cliff vest at the end of a three year measurement period, except for 2012 grants to those individuals who are retirement eligible during the grant period, as such grants are subject to accelerated vesting as the grant is earned over the course of the vesting period (i.e., a pro-rata payout occurs based on the retirement date). Participants are eligible to be awarded shares ranging from 0% to 200% of the original award amount, based on certain defined performance measures. Compensation expense is recognized using the straight line method over the vesting period, unless the employee has an accelerated vesting schedule.
	The 2012 awards have three measurement criteria on which the final payout of the award is based - (i) the three year compounded annual growth rate (CAGR) of net sales, (ii) the three year CAGR of diluted earnings per share, and (iii) the three year average of each year's free cash flow as a percentage of net sales. In accordance with the applicable accounting literature, these measures are treated as performance conditions. The fair value of these awards is determined based on the market value of the underlying stock price at the grant date with cumulative compensation expense recognized to date being increased or decreased based on changes in the forecasted pay out percentages at the end of each reporting period.
	The 2013 and 2014 awards have two measurement criteria on which the final payout of each award is based - (i) the three year return on invested capital (ROIC) compared to that of a specified group of peer companies, and (ii) the three year total shareholder return (TSR) on the performance of our common stock as compared to that of a specified group of peer companies. In accordance with the applicable accounting literature, the ROIC portion of the award is considered a performance condition. As such, the fair value of the ROIC portion is determined based on the market value of the underlying stock price at the grant date with cumulative compensation expense recognized to date being increased or decreased based on changes in the forecasted pay out percentage at the end of each reporting period. The TSR portion of the award is considered a market condition. As such, the fair value of this award was determined on the date of grant using a Monte Carlo simulation valuation model with related compensation expense fixed on the grant date and expensed on a straight-line basis over the life of the awards that ultimately vest with no changes for the final projected payout of the award.
	Below are the assumptions used in the Monte Carlo calculation:
	2014			2013
Expected volatility	33.7	%		37.1	%
Expected term (in years)	3			3
Risk-free interest rate	0.67	%		0.4	%
Expected dividend yield	—			—
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 common stock; therefore, a dividend yield of 0% was used in the Monte Carlo simulation valuation model.
Actual performance during the relevant period for the 2012 grant, which vested as of December 31, 2014, met the target performance criteria and shares will be paid out at 118.2% of target during the first quarter of 2015.
A summary of activity under the performance-based restricted stock plans for the fiscal years ended 2014, 2013 and 2012 is presented below:
	2014					2013					2012
	Awards Outstanding			Weighted-		Awards Outstanding			Weighted-		Awards Outstanding		Weighted-
				Average					Average				Average
				Grant Date Fair Value					Grant Date Fair Value				Grant Date Fair Value
Non-vested awards outstanding at beginning of year	71,175			$	47.49	73,458			$	38.01	101,730		$	31.19
Awards granted	51,850			58.61		47,625			47.1		22,120		41.27
Stock issued	(14,383	)		47.89		(33,538	)		27.43		(43,750	)	23.86
Awards forfeited or expired	(16,205	)		52.71		(16,370	)		44.9		(6,642	)	37.67
Non-vested awards outstanding at end of year	92,437			$	52.75	71,175			$	47.49	73,458		$	38.01
We recognized $2.3 million, $1.3 million, and $0.5 million of compensation expense related to performance-based restricted stock grants for the years ended December 31, 2014, 2013 and 2012, respectively. The 2014 expense represents a 118.2% projected payout for the 2012 performance-based grants, a projected payout of 141% for the performance-based awards granted in 2013 and a projected payout of 144% for the performance-based awards granted in 2014. The 2013 expense represents a 108% projected payout for the 2011 performance-based grants, and a projected payout of 108% for the performance-based awards granted in 2012 and a projected payout of 166% for the performance-based awards granted in 2013, respectively. The 2012 expense represented a 200.0% projected payout for the 2010 performance-based grants, and a projected payout of 100% for the performance-based awards granted in 2011 and 2012, respectively.
As of December 31, 2014, there was $3.8 million of total unrecognized compensation cost related to unvested performance-based restricted stock. That cost is expected to be recognized over a weighted-average period of 1.4 years.
Time-Based Restricted Stock
In 2011, we began granting time-based restricted stock awards to certain key executives and other key members of the Company’s management team. We currently have grants from 2011, 2012, 2013 and 2014 outstanding. Most of the 2011 and 2012 grants cliff vest at the end of the three year vesting period. The 2013 and 2014 grants ratably vest on the first, second and third anniversaries of the original grant date. We recognize compensation expense on all of these awards on a straight-line basis over the vesting period. The fair value of the award is determined based on the market value of the underlying stock price at the grant date.
	2014					2013					2012
	Awards Outstanding			Weighted-		Awards Outstanding			Weighted-		Awards Outstanding		Weighted-Average Grant Date Fair Value
				Average					Average
				Grant Date Fair Value					Grant Date Fair Value
Non-vested awards outstanding at beginning of year	231,026			$	48.54	115,139			$	43.27	86,707		$	44.55
Awards granted	93,780			61.7		156,665			51.78		51,790		40.99
Stock issued	(62,378	)		47.19		(12,436	)		43.97		(16,620	)	41.64
Awards forfeited or expired	(24,042	)		51.19		(28,342	)		47.07		(6,738	)	46.21
Non-vested awards outstanding at end of year	238,386			$	53.8	231,026			$	48.54	115,139		$	43.27
We recognized $3.6 million, $2.5 million, and $1.6 million of compensation expense related to time-based restricted stock for years ended December 31, 2014, 2013 and 2012, respectively. As of December 31, 2014, there was $7.8 million of total unrecognized compensation cost related to unvested time-based restricted stock. That cost is expected to be recognized over a weighted-average period of 1.7 years.
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 13th month anniversary of the grant date unless the individual elects to defer the receipt of these shares. Each deferred stock unit results in the issuance of one share of Rogers’ stock. The grant of deferred stock units is typically done annually in the second quarter of each year. The fair value of the award is determined based on the market value of the underlying stock price at the grant date.
	2014					2013					2012
	Awards Outstanding			Weighted-		Awards Outstanding			Weighted-		Awards Outstanding		Weighted-Average Grant Date Fair Value
				Average					Average
				Grant Date Fair Value					Grant Date Fair Value
Non-vested awards outstanding at beginning of year	31,550			$	26.77	30,150			$	26.13	27,350		$	28.8
Awards granted	14,700			58.45		16,800			41.67		17,600		38.64
Stock issued	(16,100	)		60.08		(15,400	)		41.77		(14,800	)	45.95
Non-vested awards outstanding at end of year	30,150			$	24.43	31,550			$	26.77	30,150		$	26.13
We recognized compensation expense related to deferred stock units of $0.8 million, $0.7 million and $0.7 million, for the years ended December 31, 2014, 2013 and 2012, respectively.
Employee Stock Purchase Plan
We have an employee stock purchase plan (ESPP) that allows eligible employees to purchase, through payroll deductions, shares of our common stock at a discount to fair market value. The ESPP has two 6 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 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 amount 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 approximately $0.5 million of compensation expense associated with the plan for the year ended December 31, 2014, $0.5 million for the year ended December 31, 2013 and $0.5 million for the year ended December 31, 2012.

Commitments_and_Contingencies

Commitments and Contingencies

12 Months Ended

Dec. 31, 2014

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

COMMITMENTS AND CONTINGENCIES

Leases

Our principal noncancellable operating lease obligations are for building space and vehicles. The leases generally provide that we pay maintenance costs. The lease periods typically range from one to five years and include purchase or renewal provisions. We have leases that are cancellable with minimal notice. Additionally, we have a capital lease on our manufacturing facility in Eschenbach, Germany, which was entered into in 2011. Further, in 2013 we entered into an operating lease for the Rogers Innovation Center at Northeastern University in Burlington, Massachusetts. The lease term expires three years from the November 2014 inception date and lease payments are determined based upon square footage occupied by Rogers personnel during the lease period that currently amount to approximately $10k per month. Further, under the lease arrangement, Rogers agreed to fund research activities for the University totaling a minimum of $0.5 million annually over the three year term of the agreement.

Lease / Depreciation Expense

(Dollars in thousands)

2014

2013

2012

Operating leases

$

2,716

$

2,634

$

2,655

Capital lease

743

1,233

1,627

Future Minimum Lease Payments

(Dollars in thousands)

2015

2016

2017

2018

2019

Operating leases

$

2,329

$

1,631

$

1,112

$

827

$

108

Capital lease

743

743

743

743

743

(Dollars in thousands)

Operating Leases

Capital Lease

Total future minimum lease payments

$

6,080

$

4,827

We are currently engaged in the following environmental and legal proceedings:

Superfund Sites

We are currently involved as a potentially responsible party (PRP) in one active case involving a waste disposal site, the Chatham Superfund Site. The costs incurred since inception for this claim have been immaterial and have been primarily covered by insurance policies, for both legal and remediation costs. In this matter we have been assessed a cost sharing percentage of approximately 2% in relation to the range for estimated total cleanup costs of $18.8 million to $29.6 million. We believe that we have sufficient insurance coverage to fully cover this liability and have recorded a liability and related insurance receivable of approximately $0.4 million as of December 31, 2014, which approximates our share of the low end of the estimated range. We believe we are a de minimis participant and, as such, have been allocated an insignificant percentage of the total PRP cost sharing responsibility. Based on facts presently known to us, we believe that the potential for the final results of this case having a material adverse effect on our results of operations, financial position or cash flows is remote. This case has been ongoing for many years and we believe that it will continue on for the indefinite future. No time frame for completion can be estimated at the present time.

PCB Contamination

We have been working with the Connecticut Department of Energy and Environmental Protection (CT DEEP) and the United States Environmental Protection Agency, Region I, in connection with certain polychlorinated biphenyl (PCB) contamination at our facility in Woodstock, Connecticut. The issue was originally discovered in the soil at the facility in the late 1990s, and this initial issue was remediated in 2000. Further contamination was later found in the groundwater beneath the property, which was addressed with the installation of a pump and treat system in 2011. Additional PCB contamination at this facility was found in the facility's original buildings, courtyards and surrounding areas including an on-site pond. Remediation costs related to this contamination are expected to approximate $0.7 million. Remediation activities of the affected buildings and courtyards were completed in 2014 at a total cost of $0.5 million. Currently, we have a reserve of $0.2 million for the pond remediation recorded on our consolidated statements of financial position. We believe this reserve will be adequate to cover the remaining remediation work related to the soil and pond contamination based on the information known at this time. However, if additional contamination is found, the cost of the remaining remediation may increase.

Overall, we have spent approximately $2.4 million in remediation and monitoring costs related to these PCB contamination issues. The future costs related to the maintenance of the groundwater pump and treat system now in place at the site are expected to be minimal. We believe that the remaining remediation activity will continue for several more years and no time frame for completion can be estimated at the present time.

Asbestos Litigation

A significant number of asbestos-related product liability claims have been brought against numerous United States industrial companies where the third-party plaintiffs allege personal injury from exposure to asbestos-containing products. We have been named, along with hundreds of other companies, as a defendant in some of these claims. In virtually all of these claims filed against us, the plaintiffs are seeking unspecified damages, or, if an amount is specified, such amount merely represents a jurisdictional amount. However, occasionally specific damages are alleged and in such situations, plaintiffs' lawyers often sue dozens of defendants, frequently without factual basis or support. As a result, even when a specific amount of damages is alleged, such action can be arbitrary, both as to the amount being sought and the defendant being charged with such damages.

We did not mine, mill, manufacture or market asbestos; rather we made a limited number of products which contained encapsulated asbestos. Such products were provided to industrial users. We stopped manufacturing these products in the late 1980s.

•

Claims

We have been named in asbestos litigation primarily in Illinois, Pennsylvania and Mississippi. As of December 31, 2014, there were 438 pending claims compared to 362 pending claims at December 31, 2013. The number of pending claims at a particular time can fluctuate significantly from period to period depending on how successful we have been in getting these cases dismissed or settled. Some jurisdictions prohibit specifying alleged damages in personal injury tort cases such as these, other than a minimum jurisdictional amount which may be required for such reasons as allowing the case to be litigated in a jury trial (which the plaintiffs believe will be more favorable to them than if heard only before a judge) or allowing the case to be litigated in federal court. This is in contrast to commercial litigation, in which specific alleged damage claims are often permitted. The prohibition on specifying alleged damages sometimes applies not only to the suit when filed but also during the trial – in some jurisdictions the plaintiff is not actually permitted to specify to the jury during the course of the trial the amount of alleged damages the plaintiff is claiming. Further, in those jurisdictions in which plaintiffs are permitted to claim specific alleged damages, many plaintiffs nonetheless still choose not to do so. In those cases in which plaintiffs are permitted to and choose to assert specific dollar amounts in their complaints, we believe the amounts claimed are typically not meaningful as an indicator of a company’s potential liability. This is because (1) the amounts claimed may bear no relation to the level of the plaintiff’s injury and are often used as part of the plaintiff’s litigation strategy, (2) the complaints typically assert claims against numerous defendants, and often the alleged damages are not allocated against specific defendants, but rather the broad claim is made against all of the defendants as a group, making it impossible for a particular defendant to quantify the alleged damages that are being specifically claimed against it and therefore its potential liability, and (3) many cases are brought on behalf of plaintiffs who have not suffered any medical injury, and ultimately are resolved without any payment or payment of a small fraction of the damages initially claimed.

We believe the rate at which plaintiffs filed asbestos-related suits against us increased in 2001, 2002, 2003 and 2004 because of increased activity on the part of plaintiffs to identify those companies that sold asbestos-containing products, but which did not directly mine, mill or market asbestos. A significant increase in the volume of asbestos-related bodily injury cases arose in Mississippi in 2002. This increase in the volume of claims in Mississippi was apparently due to the passage of tort reform legislation (applicable to asbestos-related injuries), which became effective on September 1, 2003 and which resulted in a higher than average number of claims being filed in Mississippi by plaintiffs seeking to ensure their claims would be governed by the law in effect prior to the passage of tort reform. The number of asbestos related suits filed against us decreased slightly in 2005 and 2006, but increased slightly in 2007, declined in 2008 and increased again in 2009 and 2010. The number of lawsuits filed against us in 2011, 2012, 2013 and 2014 was significantly higher than in 2010 due in large part to the filings of 3 plaintiff law firms in Madison County, Illinois. These new lawsuits are reflected in the National Economic Research Associates, Inc. (“NERA”) and Marsh USA, Inc. (“Marsh”) reports. (See "Impact on Financials Statements" section below.) NERA is a consulting firm with expertise in the field of evaluating mass tort litigation related to asbestos bodily-injury claims. Marsh is a consulting firm with expertise in the field of evaluating insurance coverage and the likelihood of recovery for asbestos-related claims.

•

Defenses

In many cases, plaintiffs are unable to demonstrate that they have suffered any compensable loss as a result of exposure to our asbestos-containing products. We continue to believe that a majority of the claimants in pending cases will not be able to demonstrate exposure or loss. This belief is based in large part on the limited number of asbestos-related products manufactured and sold by us and the fact that the asbestos was encapsulated in such products. In addition, even at sites where the presence of an alleged injured party can be verified during the same period those products were used, our liability cannot be presumed because even if an individual contracted an asbestos-related disease, not everyone who was employed at a site was exposed to the asbestos containing products that we manufactured. Based on these and other factors, we have and will continue to vigorously defend ourselves in asbestos-related matters.

•

Dismissals and Settlements

Cases involving us typically name 50-300 defendants, although some cases have had as few as 1 and as many as 833 defendants. We have obtained dismissals of more than 60% of these claims. For the year ended December 31, 2014, one hundred four (104) claims were dismissed and thirteen (13) were settled. For the year ended December 31, 2013 we had one hundred fifteen (115) claims dismissed and twenty-three (23) settled. The majority of costs have been paid by our insurance carriers, including the costs associated with the small number of cases that have been settled. Such settlements totaled approximately $3.2 million for the year ended December 31, 2014, compared to $4.8 million for the year ended December 31, 2013. Although these figures provide some insight into our experience with asbestos litigation, no guarantee can be made as to the dismissal and settlement rates that we will experience in the future.

Settlements are made without any admission of liability. Settlement amounts may vary depending upon a number of factors, including the jurisdiction where the action was brought, the nature and extent of the disease alleged and the associated medical evidence, the age and occupation of the claimant, the existence or absence of other possible causes of the alleged illness of the alleged injured party and the availability of legal defenses, as well as whether the action is brought alone or as part of a group of claimants. To date, we have been successful in obtaining dismissals for a majority of the claims and have settled only a limited number. Most of the settled claims were settled for nominal amounts, and the majority of such payments have been borne by our insurance carriers. In addition, to date, we have not been required to pay any punitive damage awards.

•

Potential Liability

NERA has historically been engaged to assist us in projecting our future asbestos-related liabilities and defense costs with regard to pending claims and future claims. Projecting future asbestos costs is subject to numerous variables that are extremely difficult to predict, including the number of claims that might be received, the type and severity of the disease alleged by each claimant, the long latency period associated with asbestos exposure, dismissal rates, costs of medical treatment, the financial resources of other companies that are co-defendants in claims, uncertainties surrounding the litigation process from jurisdiction to jurisdiction and from case to case and the impact of potential changes in legislative or judicial standards, including potential tort reform. Furthermore, any predictions with respect to these variables are subject to even greater uncertainty as the projection period lengthens. In light of these inherent uncertainties, the  variability of our claims history and consultations with NERA, we currently believe that ten years is the most reasonable period for recognizing a reserve for future costs, and that costs that might be incurred after that period are not reasonably estimable at this time. As a result, we also believe that our ultimate asbestos-related contingent liability (i.e., our indemnity or other claim disposition costs plus related legal fees) cannot be estimated with certainty. (See "Impact on Financials Statements" section below for further discussion.)

•

Insurance Coverage

Our applicable insurance policies generally provide coverage for asbestos liability costs, including coverage for both indemnity and defense costs. Following the initiation of asbestos litigation, an effort was made to identify all of our primary, umbrella and excess level insurance carriers that provided applicable coverage beginning in the 1950s through the mid-1980s. We located primary policies for all such years except for the early 1960s. With respect to this period, we entered into an arrangement with ACE Property & Casualty Insurance Company in 2005, pursuant to which we and they share in asbestos liabilities allocable to such period. We have located umbrella or excess layer policies for all such years except for the period from May 18, 1961 to May 18, 1964. We believe that a policy was purchased from Continental Casualty Company covering this period based upon documents we have found, but the insurer has denied coverage. This policy has not yet been triggered.

Where appropriate, carriers were put on notice of the litigation. Marsh has historically been engaged to work with us to project our insurance coverage for asbestos-related claims. Marsh’s conclusions are based primarily on a review of our coverage history, application of reasonable assumptions on the allocation of coverage consistent with certain industry practices, an assessment of the creditworthiness of the insurance carriers, analysis of applicable deductibles, retentions and policy limits, the experience of NERA and a review of NERA’s reports.

•

Cost Sharing Agreement

To date, our insurance carriers have paid for substantially all of the settlement and defense costs associated with our asbestos-related claims. The current cost sharing agreement between us and such insurance carriers is primarily designed to facilitate the ongoing administration and payment of such claims by the carriers until the applicable insurance coverage is exhausted. This agreement, which replaced an older agreement that had expired, can be terminated by election of any party thereto after January 25, 2015. Absent any such election, the agreement will continue until a party elects to terminate it.

In 2013 and 2014, the primary layer insurance policies providing coverage for the January 1, 1965 to January 1, 1967 periods exhausted. The cost sharing agreement contemplates that any excess carrier over exhausted primary layer carriers will become a party to the cost sharing agreement, replacing the coverage provided by the exhausted primary policies if the carrier providing such excess coverage is not already a party to the cost sharing agreement. The excess carrier providing coverage for the period set forth above is currently providing applicable insurance coverage in accordance with the allocation provisions of the cost sharing agreement.

•

Impact on Financial Statements

The models developed for determining the potential exposure and related insurance coverage were developed by outside consultants deemed to be experts in their respective fields with the forecast for asbestos related liabilities generated by NERA and the related insurance receivable projections developed by Marsh. The models contain numerous assumptions that significantly impact the results generated by the models. We believe the assumptions made are reasonable at the present time, but are subject to uncertainty based on the actual future outcome of our asbestos litigation. We determined that a ten-year projection period is now appropriate as we have experience in addressing asbestos related lawsuits over the last few years to use as a baseline to project the liability over ten years. However, we do not believe we have sufficient data to justify a longer projection period at this time. As of December 31, 2014, the estimated liability and estimated insurance recovery for the ten-year period through 2024 was $56.5 million and $53.0 million, respectively. Each year we evaluate the changes in the estimated liability and estimated insurance recovery based on the projections of asbestos litigation and corresponding insurance coverage for that litigation and record the resulting expense or income. For the years ended December 31, 2014 and 2012, we recognized expense of $0.8 million and $2.7 million, respectively, and for the year ended December 31, 2013 we recorded income of $0.5 million.

The amounts recorded for the asbestos-related liability and the related insurance receivables described above were based on facts known at the time and a number of assumptions. However, projecting future events, such as the number of new claims to be filed each year, the average cost of disposing of such claims, the length of time it takes to dispose of such claims, coverage issues among insurers and the continuing solvency of various insurance companies, as well as the numerous uncertainties surrounding asbestos litigation in the United States could cause the actual liability and insurance recoveries for us to be higher or lower than those projected or recorded.

There can be no assurance that our accrued asbestos liabilities will approximate our actual asbestos-related settlement and defense costs, or that our accrued insurance recoveries will be realized. We believe that it is reasonably possible that we will incur additional charges for our asbestos liabilities and defense costs in the future, which could exceed existing reserves, but such excess amount cannot be reasonably estimated at this time. We will continue to vigorously defend ourselves and believe we have substantial unutilized insurance coverage to mitigate future costs related to this matter.

Other Environmental and General Litigation

•

In the second quarter of 2010, the CT DEEP contacted us to discuss a disposal site in Killingly, Connecticut. We undertook internal due diligence work related to the site to better understand the issue and our alleged involvement. As a matter of procedure, we have submitted an insurance claim for the disposal site, but we currently do not know the nature and extent of any alleged contamination at the site, how many parties could be potentially involved in any remediation, if necessary, or the extent to which we could be deemed a potentially responsible party. CT DEEP has not made any assessment of the nature of any potential remediation work that may be done, nor have they made any indication of any potential costs associated with such remediation. Therefore, based on the facts and circumstances known to us at the present time, we are not able to estimate the probability of incurring a contingent liability related to this site, nor are we able to reasonably estimate any potential range of exposure at this time. As such, no reserve has been established for this matter at this time. We continually monitor this situation and are in correspondence with the CT DEEP as appropriate. When and if facts and circumstances related to this matter change, we will review our position and our ability to estimate the probability of any potential loss contingencies, as well as the range of any such potential exposure.

•

The Rogers Corporate Headquarters located in Rogers, Connecticut is part of the Connecticut Voluntary Corrective Action

Program (VCAP). As part of this program, we have had conversations with the CT DEEP to begin to determine if any corrective actions need to be taken at the site related to any potential contamination issues. We are currently in the early stages of evaluating this matter and have initiated internal due diligence work related to the site to better understand any potential issues.

As of December 31, 2014, a reserve of $0.1 million was recorded for the continuing assessments to determine the extent of any potential remediation that may be required. However, at this time, it is currently unknown what the nature and extent of any potential contamination is at the site, nor what any potential remediation or associated costs would be if any such issues were found. Therefore, based on the facts and circumstances known to us at the present time, we are unable to estimate the probability of incurring a contingent liability related to environmental remediation at this site, nor are we able to reasonably estimate any potential range of exposure at this time. As such, no reserve specific to environmental remediation activity has been established for this matter at this time.

•

In 2013, we became aware of a claim made by a sales agent/distributor in Europe for the alleged improper termination of our relationship. The sales agent/distributor seeks compensation for the terminated relationship. During 2014, a mediation process was initiated and we have determined that the low end of the range for a probable liability in this matter is approximately $0.6 million and have recorded this reserve in our consolidated statements of financial position.

In addition to the above issues, the nature and scope of our business brings us in regular contact with the general public and a variety of businesses and government agencies. Such activities inherently subject us to the possibility of litigation, including environmental and product liability matters that are defended and handled in the ordinary course of business. We have established accruals for matters for which management considers a loss to be probable and reasonably estimable. It is the opinion of management that facts known at the present time do not indicate that such litigation, after taking into account insurance coverage and the aforementioned accruals, will have a material adverse impact on our results of operations, financial position or cash flows.

Business_Segment_and_Geographi

Business Segment and Geographic Information	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Business Segment and Geographic Information	BUSINESS SEGMENT AND GEOGRAPHIC INFORMATION
	Our reporting structure is comprised of the following operating segments: Printed Circuit Materials (PCM), High Performance Foams (HPF) and Power Electronics Solutions (PES). Our non-core businesses are reported in the "Other" reportable segment.
	•	Printed Circuit Materials
	The Printed Circuit Materials operating segment includes printed circuit board laminate products for high frequency, high performance applications. These products have characteristics that offer performance and other functional advantages in many market applications and serve to differentiate our products from other commonly available materials. These products are sold principally to independent and captive printed circuit board fabricators that convert our laminates to custom printed circuits.
	The polymer-based dielectric layers of our circuit board laminates are proprietary materials that provide highly specialized electrical and mechanical properties. Trade names for our printed circuit board materials include RO3000®, RO4000®, RT/duroid®, ULTRALAM®, RO2800®, LoPro®, COOLSPAN® and TMM® laminates. All of these laminates are used for making circuitry that receive, transmit, and process high frequency communications signals, yet each laminate has varying properties that address specific needs and applications within the communications market. High frequency circuits are used in the equipment and devices that comprise wireless communications systems, including cellular communications, digital cellular communications, paging, direct broadcast television, global positioning, mobile radio communications, and radar for both aviation and automotive applications.
	•	High Performance Foams
	The High Performance Foams operating segment includes polyurethane and silicone foam as well as solid products manufactured in roll stock, sheet, and molded formats. These materials have characteristics that offer functional advantages in many market applications which serve to differentiate Rogers' products from other commonly available materials.
	High Performance Foams products are sold globally to converters, fabricators, distributors and original equipment manufacturers (OEMs) for use in general industrial applications, portable electronics including mobile internet devices, consumer goods, mass transportation, construction, printing applications and other markets. Trade names for our High Performance Foams include: PORON® Microcellular Urethanes used for making high performance gaskets and seals in vehicles, portable communications devices, computers and peripherals; PORON® cushion insole materials for footwear and related products; PORON® healthcare and medical materials for body cushioning and orthotic appliances; R/bak® compressible printing plate backing and mounting products for cushioning flexographic plates for printing on packaging materials; PORON® and XRD® for high impact cushioning protection; Rogers BISCO® silicone foams, solids, sponge and extrusion products for flame retardant gaskets, seals and cushioning applications in communications infrastructure equipment, aircraft, trains, cars and trucks, and for shielding extreme temperature or flame; and eSORBA® urethane foams used in portable communications, entertainment devices and other industrial applications.
	We have two 50% owned joint ventures that extend and complement our worldwide business in High Performance Foams. Rogers INOAC Corporation (RIC), a joint venture with Japan-based INOAC Corporation, manufactures high performance polyurethane foam materials in Mie and Taketoyo, Japan to predominantly serve the Japanese and Taiwanese markets. Rogers INOAC Suzhou Corporation (RIS) was established in 2004 with INOAC Corporation and provides polyurethane foam materials primarily to the Asian marketplace.
	•	Power Electronics Solutions
	The Power Electronics Solutions operating segment is comprised of direct bond copper (DBC) ceramic substrate products and busbar power distribution products. We believe that our advanced, customized components enable the performance and reliability of today’s growing array of power electronic devices and serve to increase the efficiency of applications by managing heat and ensuring the reliability of these critical devices used in converting raw energy into controlled and regulated power that can be used and managed.
	Trade names for our Power Electronics Solutions products include curamik® ceramic substrates and RO-LINX® products. Curamik® ceramic substrates are used in the design of intelligent power management devices, such as insulated gate bipolar transistor (IGBT) modules, which enable a wide range of products including highly efficient industrial motor drives, wind and solar converters and electric and hybrid electric vehicle drive systems. RO-LINX® products are used in high power electrical inverter and converter systems for use in mass transit (e.g. high speed trains); clean technology applications (e.g. wind turbines, solar farms and electric vehicles) and variable frequency drives for high to mid power applications.
	•	Other
	The Other reportable segment consists of elastomer components, floats and inverter distribution activities. Elastomer components are sold to OEMs for applications in ground transportation, office equipment, consumer and other markets. Trade names for our elastomer components include: NITROPHYL® floats for level sensing in fuel tanks, motors, and storage tanks and ENDUR® elastomer rollers and belts for document handling in copiers, printers, mail sorting machines and automated teller machines. Inverters are sold primarily to OEMs and fabricators that in turn sell to various other third parties primarily serving the portable communication and automotive markets.
	This segment previously included the results of the Composite Materials operating segment, which qualified as a discontinued operation in the fourth quarter of 2012 when we shut down production of non-woven composite materials. All results have been recast to exclude this segment from consolidated results or continuing operations.
	The following table sets forth the information about our reportable segments for the periods indicated:
	(Dollars in thousands)	High Performance Foams				Printed Circuit Materials				Power Electronics Solutions				Other			Total
	2014
	Net sales	$	173,671			$	240,864			$	171,832			$	24,544		$	610,911
	Operating income (loss)	23,143				43,703				5,355				8,226			80,427
	Total assets	219,502				215,077				375,686				24,852			835,117
	Capital expenditures	6,197				14,290				7,489				779			28,755
	Depreciation & amortization	6,561				9,575				9,332				800			26,268
	Investment in unconsolidated joint ventures	17,214				—				—				—			17,214
	Equity income (loss) in unconsolidated joint ventures	4,123				—				—				—			4,123
	2013
	Net sales	$	168,082			$	184,949			$	160,730			$	23,721		$	537,482
	Operating income (loss)	22,339				18,788				1,088				7,065			49,280
	Total assets	221,848				177,716				382,818				24,152			806,534
	Capital expenditures	3,030				7,793				5,287				749			16,859
	Depreciation & amortization	6,410				7,004				12,406				531			26,351
	Investment in unconsolidated joint ventures	18,463				—				—				—			18,463
	Equity income (loss) in unconsolidated joint ventures	4,326				—				—				—			4,326
	2012
	Net sales	$	179,421			$	161,893			$	134,279			$	23,168		$	498,761
	Operating income (loss)	25,730				8,170				(12,022		)		3,786			25,664
	Total assets	233,401				156,103				345,013				24,761			759,278
	Capital expenditures	4,947				12,849				5,746				232			23,774
	Depreciation & amortization	7,947				7,172				11,083				928			27,130
	Investment in unconsolidated joint ventures	21,171				—				—				—			21,171
	Equity income (loss) in unconsolidated joint ventures	4,743				—				—				—			4,743
	Inter-segment sales have been eliminated from the sales data in the preceding table.
	The following table sets forth the operating income (loss) reconciliation to the consolidated statements of income (loss) for the periods indicated:
		2014				2013				2012
	Operating income (loss)	$	80,427			$	49,280			$	25,664
	Equity income in unconsolidated joint ventures	4,123				4,326				4,743
	Other income (expense), net	(1,194		)		(1,240		)		(208		)
	Net realized investment gain (loss)	—				—				(3,245		)
	Interest income (expense), net	(2,946		)		(3,481		)		(4,304		)
	Income (loss) before income taxes	$	80,410			$	48,885			$	22,650
	Information relating to our operations by geographic area is as follows:
		Net Sales (1)											Long-lived Assets (2)
	(Dollars in thousands)	2014			2013				2012				2014			2013			2012
	United States	$	128,186		$	118,263			$	115,035			$	70,532		$	64,545		$	64,845
	Asia	324,643			275,969				250,682				71,661			68,613			69,830
	Europe	148,026			132,126				123,040				144,794			171,615			172,671
	Other	10,056			11,124				10,004				—			—			—
	Total	$	610,911		$	537,482			$	498,761			$	286,987		$	304,773		$	307,346
	(1)    Net sales are allocated to countries based on the location of the customer.
	(2)    Long-lived assets are based on the location of the asset and are comprised of goodwill and other intangibles and property, plant and equipment.

Restructuring_and_Impairment_C

Restructuring and Impairment Charges	12 Months Ended
	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
Restructuring and Impairment Charges	RESTRUCTURING AND IMPAIRMENT CHARGES
	•	2014
	In the fourth quarter of 2014, we recognized a $0.2 million charge related to the impairment of the investment in Solicore, Inc. As this investment does not specifically relate to any of our operating segments, we have allocated this impairment charge on a basis similar to other Corporate allocations. See Note 8 - Investment for further details on this write-down.
	In the fourth quarter of 2014, certain eligible participants in the defined benefit pension plans were given a lump sum payout offer. The payout of this program resulted in a settlement charge of $5.2 million.
	•	2013
	In 2013, we recognized approximately $10.4 million of restructuring and impairment charges. Approximately $5.7 million of these charges are related to the streamlining initiatives that began in 2012 as we incurred approximately $4.2 million in severance and related charges as a result of these activities as well as changes to the executive management team and we recognized a $1.5 million curtailment charge related to the freezing of the defined benefit pension plans. Further in 2013, we recognized a $4.6 million charge related to the impairment of the investment in Solicore, Inc. As this investment does not specifically relate to any of our operating segments, we have allocated this impairment charge on a basis similar to other Corporate allocations. See Note 8 - Investment for further details on this write-down.
	•	2012
	In 2012, we began several initiatives to streamline our organization and rationalize our cost structure in order to better position the Company for profitable growth in the future. The goal of these initiatives is to become a more streamlined organization both from an organizational and cost perspective, with efficient manufacturing capabilities that are focused on meeting our customers' needs.
	During 2012, we recorded approximately $15.9 million in restructuring and impairment charges (of which $1.8 million was recorded in “Cost of Sales” and $14.1 million was recorded in “Restructuring and impairment expense” on our consolidated statement of income (loss)). These charges were comprised of the following:
	•	$7.1 million severance and related costs associated with streamlining initiatives, including an early retirement program for certain eligible individuals. As a result of the early retirement program, we incurred $1.6 million in charges in 2012 related to a special termination benefit associated with the retirement health and life insurance benefits program, as we extended eligibility benefits to certain individuals who chose to participate in the program. We incurred $5.5 million of severance charges related primarily to the early retirement program.
	•	$3.8 million severance and related costs associated with moving the Curamik inspection process from Germany to Hungary;
	•	$3.3 million related to the shut-down of the High Performance Foams manufacturing facility in Bremen, Germany. This charge includes approximately $1.4 million of shut-down related costs, $0.9 million of severance charges, $0.8 million of accelerated depreciation on certain assets, and $0.2 million of inventory related charges;
	•	$0.5 million of charges related to the shut-down of Power Distribution Systems startup operations in North America for accelerated depreciation on certain assets, along with $0.1 million of other costs associated with the shut-down; and
	•	Other charges included, $0.4 million of accelerated depreciation of certain assets of Curamik, $0.3 million impairment charge relate to an investment related receivable, and a $0.4 million impairment charge on a license agreement.
	High Performance Foams
	In the second quarter of 2012, we announced the shut-down of the High Performance Foams manufacturing facility in Bremen, Germany. This shut-down was completed in the first quarter of 2013. The manufacture of certain silicone foam materials produced in the Bremen facility was consolidated into our existing silicone foam manufacturing facility in Carol Stream, Illinois, while other product lines were discontinued. Charges related to the shut-down of the facility include the following: $0.9 million of severance charges related to the termination of certain employees, $0.8 million of accelerated depreciation expense on certain assets that were no longer to be used in production, $0.2 million of inventory related charges and $0.1 million related to a fixed asset disposal. We also incurred an additional $1.4 million in costs related to the shut-down of the facility and other costs to remove and transport certain equipment to Carol Stream. In 2012, we recorded $1.0 million as restricted cash related to early termination of the Bremen Facility lease. This amount was paid to the lessor in the first quarter of 2013.
	The High Performance Foams operating segment also recognized $2.2 million in allocated severance and related costs associated with the streamlining initiatives and early retirement program.
	Printed Circuit Materials
	The Printed Circuit Materials operating segment recognized $2.9 million in allocated severance and related costs associated with the streamlining initiatives and early retirement program.
	Power Electronics Solutions
	In the third quarter of 2012, we announced a plan to move the final inspection stage of manufacturing operations in the facility in Eschenbach, Germany to Hungary. The move is expected to enable more cost effective performance of the inspection operation and was completed in 2013. We recognized approximately $3.8 million in severance charges related to the separation from employment of certain employees at the facility in Germany. We also recorded $0.4 million of accelerated depreciation related to certain assets.
	We incurred $0.5 million in accelerated depreciation associated with the shut-down of the busbar power distribution startup operation in North America, along with $0.1 million of other costs associated with the shut-down. We also incurred $0.3 million in expense related to the impairment of an investment receivable.
	The PES operating segment recognized $1.4 million in allocated severance and related costs associated with the streamlining activities and early retirement program.
	Other
	We incurred a charge of $0.4 million related to the write off of a license agreement formerly associated with the discontinued Thermal Management Solutions operating segment. We also recognized $0.3 million in allocated severance and related costs associated with the streamlining activities and early retirement program.
	The following table summarizes the restructuring and impairment charges related to these activities recorded in our operating results in 2014, 2013 and 2012.
	(Dollars in thousands)
		31-Dec-14			31-Dec-13		31-Dec-12
	Cost of Sales
	High Performance Foams
	Accelerated depreciation expense related to Bremen shut-down	$	—		$	—	$	764
	Inventory impairment related to Bremen shut-down	—			—		191
	Union ratification bonus	—			181		—
	Printed Circuit Materials
	Union ratification bonus	—			179		—
	Power Electronics Solutions
	Accelerated depreciation related to certain assets	—			—		393
	Accelerated depreciation expense related to U.S. shut-down	—			—		499
	Union ratification bonus	—			8		—
	Total charges for Cost of Sales	$	—		$	368	$	1,847
	Restructuring and Impairment
	High Performance Foams
	Pension settlement charge	1,332			—		—
	Fixed asset disposal (1)	—			—		79
	Severance related to Bremen shut-down	—			—		861
	Bremen shut down-costs	—			—		1,442
	Allocated severance and related costs	—			1,345		2,188
	Allocated Solicore impairment	42			1,617		—
	Printed Circuit Materials
	Pension settlement charge	1,954			—		—
	Allocated severance and related costs	—			802		2,915
	Allocated Solicore impairment	62			1,617		—
	Power Electronics Solutions
	Pension settlement charge	1,921			—		—
	Impairment of investment related receivable	—			—		264
	Severance and related costs	—			3,494		1,799
	Severance related to Hungary move	—			—		3,774
	PDS North America shut-down costs	—			—		149
	Allocated Solicore impairment	61			1,155		—
	Other
	Pension settlement charge	17			—		—
	License agreement expense	—			—		356
	Allocated severance and related costs	—			115		255
	Allocated Solicore impairment	1			231		—
Total charges for Restructuring and Impairment	$	5,390		$	10,376	$	14,082
(1) In the first quarter of 2012, we signed an agreement to sell our facility in Richmond, Virginia for $1.5 million. This facility had a book value of approximately $1.8 million prior to the signing of the agreement, and we recorded an impairment charge of approximately $0.4 million as of December 31, 2011, which represented the write down to the selling price minus approximately $0.1 million of estimated selling costs. The transaction closed in the second quarter of 2012.
The following table summarizes charges in the severance accrual from January 1, 2014 through December 31, 2014:
(Dollars in thousands)	Streamlining and restructuring related activities			Bremen facility shut down		Curamik finishing operations relocation to Hungary		Total
Balance at January 1, 2014	$	695		$	—	$	—	$	695
Provisions				—		—		—
Payments	(695		)	—		—		(695		)
Balance at December 31, 2014	$	—		$	—	$	—	$	—
Balances may differ from prior periods due to foreign exchange rate fluctuations.

Discontinued_Operations

Discontinued Operations	12 Months Ended
	Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	DISCONTINUED OPERATIONS
	In the fourth quarter of 2011, we made the strategic decision to end the operations of our Thermal Management Solutions operating segment. We had invested in its operations for the previous few years, but had difficulty gaining traction in the market and working through issues in the manufacturing process. Therefore, we determined that we would not achieve future success in this operation and chose to shut down operations rather than invest further. There was no activity for this segment in 2014 or 2013. For the year ended December 31, 2012, an operating loss of $0.1 million net of tax, was reflected as discontinued operations in the accompanying consolidated statements of income (loss). Net sales associated with the discontinued operations for the year ended December 31, 2012 was $0.1 million. The tax related to the discontinued operations was de minimis for 2013 and 2012.
	In the second quarter of 2012, we decided to cease production of our non-woven composite materials operating segment located in Rogers, Connecticut. Sales of non-woven products had been steadily declining for several years and totaled approximately $5.3 million for the year ended December 31, 2012. Manufacturing operations ceased by the end of 2012 and last sales out of inventory occurred in the first quarter of 2013. There was no activity for this segment in 2014. For the year ended December 31, 2013, an operating loss of $0.1 million, net of tax, was reflected as discontinued operations in the accompanying consolidated statement of income (loss). Net sales for 2013 were $0.2 million and tax related to the discontinued operation was $0.1 million for the year ended December 31, 2013. For the year ended December 31, 2012 an operating loss of $0.3 million, net of tax, was reflected as discontinued operations in the accompanying consolidated statements of income (loss). The tax related to the discontinued operations was de minimis for the year ended December 31, 2012.

Quarterly_Results_of_Operation

Quarterly Results of Operations (UNAUDITED)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Quarterly Results of Operations	QUARTERLY RESULTS OF OPERATIONS (UNAUDITED)
	(Dollars in thousands, except per share amounts)	2014
		First		Second		Third		Fourth
		Quarter		Quarter		Quarter		Quarter
	Net sales	$	146,640	$	153,495	$	163,052	$	147,724
	Gross margin	53,919		57,138		64,548		58,335
	Income (loss) from continuing operations	14,580		10,902		20,388		7,013
	Net income per share:
	Basic	$	0.81	$	0.6	$	1.12	$	0.38
	Diluted	0.79		0.58		1.09		0.37
		2013
		First		Second		Third		Fourth
		Quarter		Quarter		Quarter		Quarter
	Net sales	$	125,979	$	132,452	$	142,820	$	136,231
	Gross margin	41,289		44,429		51,186		50,796
	Income (loss) from continuing operations	6,976		5,583		13,572		11,528
	Net income per share:
	Basic	$	0.41	$	0.33	$	0.79	$	0.66
	Diluted	0.39		0.32		0.76		0.64

Recent_Accounting_Standards

Recent Accounting Standards	12 Months Ended
	Dec. 31, 2014
Recent Accounting Standards [Abstract]
Recent Accounting Standards	RECENT ACCOUNTING STANDARDS
	Revenue Recognition
	In May 2014, the FASB issued ASU No. 2014-09, "Revenue from Contracts with Customers" (Topic 606), an updated standard on revenue recognition. The core principle of the new standard is for companies to recognize revenue for goods or services in amounts that reflect the consideration to which the company expects to be entitled in exchange for those goods or services. ASU 2014-09 will be effective for us beginning January 1, 2017, and may be applied on a full retrospective or modified retrospective approach. Earlier application is prohibited. We are currently evaluating the impact of implementation of this standard on our financial statements.

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS
	On January 22, 2015, pursuant to the Stock Purchase Agreement with Handy & Harman Group, Ltd., we completed the acquisition of Arlon, LLC and its subsidiaries, other than Arlon India (Pvt) Limited, for $157.0 million, subject to post closing adjustments. In accordance with the Amended Credit Agreement and due to the size of the acquisition, we were required to obtain a waiver prior to completing the acquisition.
	We used cash on hand and our existing credit facility to fund the purchase price. The credit facility was used for $125.0 million, which was drawn on January 15, 2015. The borrowing will bear an initial interest rate of 1.9375% per annum, which is based on the one month LIBOR plus a spread between 175-200 basis points, with the actual spread determined by our leverage ratio. All borrowings under this credit agreement are due and mature on July 13, 2016, but we may prepay at any time.

SCHEDULE_II_Valuation_and_Qual

SCHEDULE II Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]
SCHEDULE II Valuation and Qualifying Accounts	Valuation and Qualifying Accounts
	Allowance for Doubtful Accounts
	(Dollars in thousands)	Balance at Beginning of Period		Charged to (Reduction of) Costs and Expenses		Taken Against Allowance			Other (Deductions) Recoveries		Balance at End of Period
	31-Dec-14	$	1,655	$	250	$	(1,429	)	$	—	$	476
	31-Dec-13	$	1,773	$	670	$	(788	)	$	—	$	1,655
	31-Dec-12	$	1,040	$	1,253	$	(520	)	$	—	$	1,773

Organization_and_Summary_of_Si1

Organization and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation
	The consolidated financial statements include the accounts of the Company and our wholly‑owned subsidiaries, after elimination of inter-company accounts and transactions.
	For all periods and amounts presented, reclassifications have been made for discontinued operations. In the fourth quarter of 2012, the operations of the non-woven composite materials operating segment (aggregated in the Other reportable segment) ended and the segment qualified as a discontinued operations. See Note 17 - Discontinued Operations for further discussion.
Cash Equivalents	Cash Equivalents
	Highly liquid investments with original maturities of 3 months or less are considered cash equivalents. These investments are stated at cost, which approximates fair value.
Marketable Securities	Marketable Securities
	We determine the appropriate classification of debt securities at the time of purchase and reevaluate such designation as of each balance sheet date. Debt securities are classified as held-to-maturity when we have the positive intent and ability to hold the securities to maturity. Marketable equity securities and debt securities not classified as held-to-maturity are classified as available-for-sale. Available-for-sale securities are carried at fair value with interest on such securities included in “Interest income” on our consolidated statements of income (loss). If the market values of individual securities are determined to be “other than temporarily” impaired, the carrying amount of such investments are written down to market value through “Net realized gain (loss)” in our consolidated statements of income (loss). Except for amounts recorded related to the auction rate securities in 2012, we have not recorded any such write down in 2014, 2013 or 2012. See Note 2 - Fair Value Measurements for further discussion on the auction rate securities.
Investments in Unconsolidated Joint Ventures	Investments in Unconsolidated Joint Ventures
	We account for our investments in and advances to unconsolidated joint ventures, all of which are 50% owned, using the equity method of accounting.
Foreign Currency	Foreign Currency
	All balance sheet accounts of foreign subsidiaries are translated or remeasured at exchange rates in effect at each year end, and income statement items are translated at the average exchange rates for the year. Resulting translation adjustments for those entities that operate under the local currency are made directly to a separate component of shareholders' equity, while remeasurement adjustments for those entities that operate under the parent's functional currency are made to the income statement as a component of “Other income (expense), net”. Currency transaction adjustments are reported as income or expense in the consolidated statements of income (loss) as a component of "Other income (expense), net".
Allowance for Doubtful Accounts	Allowance for Doubtful Accounts
	The allowance for doubtful accounts is determined based on a variety of factors that affect the potential collectability of the related receivables, including the length of time receivables are past due, customer credit ratings, financial stability of customers, specific one-time events and past customer history. In addition, in circumstances where we are made aware of a specific customer's inability to meet its financial obligations, a specific allowance is established. The majority of accounts are individually evaluated on a regular basis and appropriate reserves are established as deemed appropriate based on the criteria previously mentioned. The remainder of the reserve is based on management's estimates and takes into consideration historical trends, market conditions and the composition of our customer base.
Inventories	Inventories
	Inventories are valued at the lower of cost or market. Certain inventories, amounting to $12.5 million and $12.7 million at December 31, 2014 and 2013, respectively, are valued using the last-in, first-out (LIFO) method. These inventories accounted for 24% of total gross inventory in 2014 and 25% of total gross inventory in 2013. The cost of the remaining portion of the inventories was determined principally on the basis of first-in, first-out (FIFO) costs.
Property, Plant and Equipment	Property, Plant and Equipment
	Property, plant and equipment are stated on the basis of cost. For financial reporting purposes, provisions for depreciation are calculated on a straight‑line basis over the following estimated useful lives of the underlying assets:
		Years
	Buildings and improvements	15-Oct
	Machinery and equipment	15-May
	Office equipment	10-Mar
Software Costs	Software Costs
	We capitalize certain computer software and software development costs incurred in connection with developing or obtaining computer software for internal use when both the preliminary project stage is completed and it is probable that the software will be used as intended. Capitalized software costs include only (i) external direct costs of materials and services utilized in developing or obtaining computer software, and (ii) compensation and related benefits for employees who are directly associated with the software project. Capitalized software costs are included in property, plant and equipment on our balance sheet and amortized on a straight-line basis when placed into service over the estimated useful lives of the software, which approximates three to five years.
Goodwill and Intangible Assets	Goodwill and Intangible Assets
	Intangible assets are classified into three categories: (1) intangible assets with definite lives subject to amortization; (2) intangible assets with indefinite lives not subject to amortization; and (3) goodwill. We review goodwill, which has an indefinite life, and intangible assets with indefinite lives for impairment annually and/or if events or changes in circumstances indicate the carrying value of an asset may have been impaired. We review intangible assets with definite lives for impairment whenever conditions exist that indicate the carrying value may not be recoverable, such as in economic downturns in a market or a change in the assessment of future operations.
	Goodwill and indefinite lived intangible assets are assessed for impairment by comparing the net book value of a reporting unit to its estimated fair value. Fair values are typically established using a discounted cash flow methodology. The determination of discounted cash flows is based on the reporting unit's strategic plans and long-term operating forecasts. The revenue growth rates included in the plans are management's best estimates based on current and forecasted market conditions, and the profit margin assumptions are projected by each segment based on the current cost structure and strategic changes to the cost structure.
	Purchased or acquired patents, covenants-not-to-compete, customer relationships and licensed technology are capitalized and amortized on a straight-line or accelerated basis over their estimated useful lives.
Environmental and Product Liabilities	Environmental and Product Liabilities
	We accrue for our environmental investigation, remediation, operating and maintenance costs when it is probable that a liability has been incurred and the amount can be reasonably estimated. For environmental matters, the most likely cost to be incurred is accrued based on an evaluation of currently available facts with respect to each individual site, including existing technology, current laws and regulations and prior remediation experience. For sites with multiple potential responsible parties (PRPs), we consider our likely proportionate share of the anticipated remediation costs and the ability of the other parties to fulfill their obligations in establishing a provision for those costs. When no amount within a range of estimates is more likely to occur than another, we accrue to the low end of the range. When future liabilities are determined to be reimbursable by insurance coverage, an accrual is recorded for the potential liability and a receivable is recorded for the estimated insurance reimbursement amount. We are exposed to the uncertain nature inherent in such remediation and the possibility that initial estimates will not reflect the final outcome of a matter.
	We periodically perform a formal analysis to determine potential future liability and related insurance coverage for asbestos-related matters. Projecting future asbestos costs is subject to numerous variables that are extremely difficult to predict, including the number of claims that might be received, the type and severity of the disease alleged by each claimant, the long latency period associated with asbestos exposure, dismissal rates, costs of medical treatment, the financial resources of other companies that are co-defendants in claims, uncertainties surrounding the litigation process from jurisdiction to jurisdiction and from case to case, and the impact of potential changes in legislative or judicial standards, including potential tort reform. Furthermore, any predictions with respect to these variables are subject to even greater uncertainty as the projection period lengthens.
	The models developed for determining the potential exposure and related insurance coverage were developed by outside consultants deemed to be experts in their respective fields with the forecast for asbestos related liabilities generated by National Economic Research Associates, Inc. (NERA) and the related insurance receivable projections developed by Marsh Risk Consulting (Marsh). The models contain numerous assumptions that significantly impact the results generated by the models. We believe the assumptions made are reasonable at the present time, but are subject to uncertainty based on the actual future outcome of our asbestos litigation.
Fair Value of Financial Instruments	Fair Value of Financial Instruments
	Management believes that the carrying values of financial instruments, including cash and cash equivalents, short-term investments, accounts receivable, accounts payable, accrued liabilities and debt approximate fair value based on the maturities of these instruments.
Concentration of Credit and Investment Risk	Concentration of Credit and Investment Risk
	We extend credit on an uncollateralized basis to almost all customers. Concentration of credit and geographic risk with respect to accounts receivable is limited due to the large number and general dispersion of accounts that constitute our customer base. We routinely perform credit evaluations on our customers. At December 31, 2014 and 2013, there were no customers that individually accounted for more than ten percent of total accounts receivable. We did not experience significant credit losses on customers' accounts in 2014, 2013 or 2012.
	We invest excess cash principally in investment grade government and corporate debt securities. We have established guidelines relative to diversification and maturities in order to maintain safety and liquidity. These guidelines are periodically reviewed and modified to reflect changes in market conditions.
Income Taxes	Income Taxes
	We are subject to income taxes in the U.S. and in numerous foreign jurisdictions. We consider the undistributed earnings as of December 31, 2014 of substantially all of our foreign subsidiaries to be indefinitely reinvested and, accordingly, no U.S. income taxes have been provided thereon. If circumstances change and it becomes apparent that some, or all of the undistributed earnings as of December 31, 2014 will not be indefinitely reinvested, the provision for the tax consequences, if any, will be recorded in the period when circumstances change. Distributions out of current and future earnings are permissible to fund discretionary activities such as business acquisitions. However, when distributions are made, this could result in a higher effective tax rate.
	We have provided for potential liabilities due in various jurisdictions. In the ordinary course of global business, there are many transactions and calculations where the ultimate tax outcome is uncertain. Some of these uncertainties arise as a consequence of cost reimbursement arrangements among related entities. Although we believe our estimates are reasonable, no assurance can be given that the final tax outcome of these matters will not be different than that which is reflected in the historical income tax provisions and accruals. Such differences could have a material impact on our income tax provision and operating results in the period in which such determination is made.
	Deferred income taxes are determined based on the estimated future tax effects differences between the financial statement carrying amounts and the tax bases of existing assets and liabilities. Deferred tax assets are recognized to the extent that realization of those assets is considered to be more likely than not. A valuation allowance is established for deferred taxes when it is more likely than not that all or a portion of the deferred tax assets will not be realized.
	We record benefits for uncertain tax positions based on an assessment of whether it is more likely than not that the tax positions will be sustained by the taxing authorities. If this threshold is not met, no tax benefit of the uncertain position is recognized. If the threshold is met, we recognize the largest amount of the tax benefit that is more than 50 percent likely to be realized upon ultimate settlement with the related tax authority.
	We recognize interest and penalties related to unrecognized tax benefits within the income tax expense line in the accompanying consolidated statements of income (loss). Accrued interest and penalties are included within the related tax liability line in the consolidated statements of financial position.
Revenue Recognition	Revenue Recognition
	Revenue from product sales to customers is recognized when title passes to the customer, when persuasive evidence of an arrangement exists, the price is fixed or determinable, and collection is reasonably assured.
Shipping and Handling Charges	Shipping and Handling Charges
	Costs that we incur for shipping and handling charges are charged to “Cost of sales” and payments received from our customers for shipping and handling charges are included in “Net sales” on our consolidated statements of income (loss).
Pension and Retiree Health care and Life Insurance Benefits	Pension and Retiree Health Care and Life Insurance Benefits
	We provide various defined benefit pension plans for our U.S. employees and we sponsor multiple fully insured or self-funded medical plans and fully insured life insurance plans for retirees. In 2013, the defined benefit plans were frozen, so that future benefits no longer accrue. The costs and obligations associated with these plans are dependent upon various actuarial assumptions used in calculating such amounts. These assumptions include discount rates, long-term rate of return on plan assets, mortality rates, and other factors. The assumptions used in these models are determined as follows: (i) the discount rate used is based on the PruCurve index; (ii) the long-term rate of return on plan assets is determined based on historical portfolio results, market results and our expectations of future returns, as well as current market assumptions related to long-term return rates; and (iii) the mortality rate is based on a mortality projection that estimates current longevity rates and their impact on the long-term plan obligations. We review these assumptions periodically throughout the year and update as necessary.
Earnings Per Share	Earnings Per Share
	The following table sets forth the computation of basic and diluted earnings per share from continuing operations:
	(In thousands, except per share amounts)	2014		2013		2012
	Numerator:
	Net income (loss)	$	52,883	$	37,659	$	69,134
	Denominator:
	Weighted-average shares outstanding - basic	18,177,178		17,197,840		16,426,209
	Effect of dilutive shares	520,600		570,235		564,949
	Weighted-average shares outstanding - diluted	18,697,778		17,768,075		16,991,158
	Basic income (loss) per share:	$	2.91	$	2.19	$	4.21
	Diluted income (loss) per share:	2.83		2.12		4.07
	Certain potential ordinary shares were excluded from the calculation of diluted weighted-average shares outstanding because they would have an anti-dilutive effect on net income per share. No shares were excluded in 2014 or 2013. In 2012 68,000 shares were excluded.
Use of Estimates	Use of Estimates
	The preparation of financial statements, in conformity with U.S. generally accepted accounting principles, requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.
Hedging Activity	Hedging Activity
	We use derivative instruments to manage commodity, interest rate and foreign currency exposures. Derivative instruments are viewed as risk management tools and are not used for trading or speculative purposes. To qualify for hedge accounting treatment, derivatives used for hedging purposes must be designated and deemed effective as a hedge of the identified underlying risk exposure at the inception of the contract. Accordingly, changes in fair value of the derivative contract must be highly correlated with changes in the fair value of the underlying hedged item at inception of the hedge and over the life of the hedge contract.
	Derivatives used to hedge forecasted cash flows associated with foreign currency commitments or forecasted commodity purchases are accounted for as cash flow hedges. For those derivative instruments that qualify for hedge accounting treatment, gains and losses are recorded in other comprehensive income and reclassified to earnings in a manner that matches the timing of the earnings impact of the hedged transactions. The ineffective portion of all hedges, if any, is recognized currently in earnings. For those derivative instruments that do not qualify for hedge accounting treatment, any related gains and losses are recognized in the consolidated statements of income (loss) as a component of "Other income/expense".
Advertising Costs	Advertising Costs
	Advertising is expensed as incurred and amounted to $3.3 million for 2014, $2.9 million for 2013 and $2.0 million for 2012.
Equity Compensation	Equity Compensation
	Stock-based compensation is comprised of stock options and restricted stock. Stock options are measured at the grant date, based on the grant-date fair value of the awards ultimately expected to vest and, in most cases, is recognized as an expense on a straight-line basis over the vesting period, which is typically four years. A provision in our stock option agreements requires us to accelerate the expense for retirement eligible employees, as any unvested options would immediately vest upon retirement for such employees. We develop estimates used in calculating the grant-date fair value of stock options to determine the amount of stock-based compensation to be recorded. We calculate the grant-date fair value using the Black-Scholes valuation model. The use of this valuation model requires estimates of assumptions such as expected volatility, expected term, risk-free interest rate, expected dividend yield and forfeiture rates.
	Performance-based restricted stock compensation expense is based on achievement of certain performance and service conditions. The fair value of the awards is determined based on the market value of the underlying stock price at the grant date and marked to market over the vesting period based on projections of the underlying performance measures.
	Time-based restricted stock compensation awards are expensed over the vesting period, which is typically three years. The fair value of the awards is determined based on the market value of the underlying stock price at the grant date.

Organization_and_Summary_of_Si2

Organization and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Schedule of inventory	Inventories consisted of the following:
	(Dollars in thousands)	December 31, 2014			December 31, 2013
	Raw materials	$	26,787		$	24,301
	Work-in-process	16,564			13,536
	Finished goods	25,277			29,052
	Total Inventory	$	68,628		$	66,889
Schedule of property, plant and equipment, estimated useful lives	For financial reporting purposes, provisions for depreciation are calculated on a straight‑line basis over the following estimated useful lives of the underlying assets:
		Years
	Buildings and improvements	15-Oct
	Machinery and equipment	15-May
	Office equipment	10-Mar
	(Dollars in thousands)	December 31,			December 31,
		2014			2013
	Land	$	14,045		$	14,986
	Buildings and improvements	132,105			136,959
	Machinery and equipment	165,979			160,843
	Office equipment	36,810			34,972
	Equipment in process	26,573			21,360
		375,512			369,120
	Accumulated depreciation	(225,092		)	(222,189		)
	Total property, plant and equipment, net	$	150,420		$	146,931
Schedule of calculation of numerator and denominator in earnings per share	The following table sets forth the computation of basic and diluted earnings per share from continuing operations:
	(In thousands, except per share amounts)	2014			2013			2012
	Numerator:
	Net income (loss)	$	52,883		$	37,659		$	69,134
	Denominator:
	Weighted-average shares outstanding - basic	18,177,178			17,197,840			16,426,209
	Effect of dilutive shares	520,600			570,235			564,949
	Weighted-average shares outstanding - diluted	18,697,778			17,768,075			16,991,158
	Basic income (loss) per share:	$	2.91		$	2.19		$	4.21
	Diluted income (loss) per share:	2.83			2.12			4.07

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Assets measured at fair value on a recurring basis, categorized by the level of inputs used in the valuation	Assets measured at fair value on a recurring basis, categorized by the level of inputs used in the valuation, include:
	(Dollars in thousands)	Carrying amount as of			Level 1		Level 2			Level 3
		31-Dec-14
	Pension assets	$	170,600		$	51,097	$	107,739		$	11,764
	Foreign currency contracts	(18		)	—		(18		)	—
	Copper derivative contracts	355			—		355			—
	Interest rate swap	(144		)	—		(144		)	—
	(Dollars in thousands)	Carrying amount as of			Level 1		Level 2			Level 3
		31-Dec-13
	Pension assets	$	171,218		$	119,277	$	38,584		$	13,357
	Foreign currency contracts	(77		)	—		(77		)	—
	Copper derivative contracts	984			—		984			—
	Interest rate swap	(296		)	—		(296		)	—
Assets measured at fair value on a nonrecurring basis	The following table presents information about our assets and liabilities measured at fair value on a non-recurring basis as of December 31, 2014, aggregated by the level in the fair value hierarchy within which those measurements fall. This Level 3 asset represents the investment in Solicore, Inc. The valuation is based on our evaluation of Solicore's financial performance through December 31, 2014 and the most recent round of capital financing that was initiated in the fourth quarter of 2014. See Note 8 - Investment for further details.
	(Dollars in thousands)	Carrying amount as of December 31, 2014			Level 1		Level 2			Level 3
	Solicore investment	$	341		$	—	$	—		$	341
	The table below sets forth a summary of changes in the fair value of the Solicore investment Level 3 asset for the year ended December 31, 2014.
	(Dollars in thousands)	Solicore investment
	Balance at beginning of year	$	507
	Cash investment	—
	Impairment reported in earnings	(166		)
	Balance at end of year	$	341

Hedging_Transactions_and_Deriv1

Hedging Transactions and Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Notional values of outstanding derivative positions
	Notional Value of Copper Derivatives
	January 2015- March 2015	156 metric tons per month
	April 2015 - June 2015	150 metric tons per month
	July 2015 - September 2015	135 metric tons per month
	October 2015 - December 2015	123 metric tons per month
	January 2016 - March 2016	30 metric tons per month
	Notional Values of Foreign Currency Derivatives
	YEN/USD	¥	200,000,000
	KRW/USD	₩	1,854,700,000
	YEN/EUR	¥	315,000,000
	HUF/EUR	50,000,000
	CNY/USD	¥	134,000,000
Gain (loss) on derivative instruments
	(Dollars in thousands)		The Effect of Current Derivative Instruments on the Financial Statements for the year ended December 31, 2014				Fair Values of Derivative Instruments as of December 31, 2014
			Location of gain (loss)	Amount of			Other Assets
	Foreign Exchange Contracts			gain (loss)			(Liabilities)
	Contracts not designated as hedging instruments		Other income, net	$	(19	)	$	(19	)
	Copper Derivative Instruments
	Contracts not designated as hedging instruments		Other income, net	(605		)	355
	Interest Rate Swap Instrument
	Contracts designated as hedging instruments		Other comprehensive income (loss)	152			(144		)
	(Dollars in thousands)		The Effect of Current Derivative Instruments on the Financial Statements for the year ended December 31, 2013				Fair Values of Derivative Instruments as of December 31, 2013
			Location of gain (loss)	Amount of			Other Assets
	Foreign Exchange Contracts			gain (loss)			(Liabilities)
	Contracts not designated as hedging instruments		Other income, net	$	(79	)	$	(79	)
	Contracts designated as hedging instruments		Other comprehensive income (loss)	(24		)	2
	Copper Derivative Instruments
	Contracts not designated as hedging instruments		Other income, net	(373		)	984
	Interest Rate Swap Instrument
	Contracts designated as hedging instruments		Other comprehensive income (loss)	(296		)	(296		)

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Accumulated balances related to each component of accumulated other comprehensive income (loss)	The changes in accumulated other comprehensive income (loss) by component for the year ended December 31, 2014 were as follows:
	(Dollars in thousands)	Foreign currency translation adjustments			Funded status of pension plans and other postretirement benefits (1)			Unrealized gain (loss) on derivative instruments (2)			Total
	Beginning Balance December 31, 2013	$	22,756		$	(33,997	)	$	(209	)	$	(11,450	)
	Other comprehensive income before reclassifications	(36,949		)	—			(93		)	(37,042		)
	Actuarial net gain (loss) incurred in the fiscal year	—			(20,715		)	—			(20,715		)
	Amounts reclassified from accumulated other comprehensive income	—			3,904			209			4,113
	Net current-period other comprehensive income	(36,949		)	(16,811		)	116			(53,644		)
	Ending Balance December 31, 2014	$	(14,193	)	$	(50,808	)	$	(93	)	$	(65,094	)
	(1) Net of taxes of $11,952 and $2,900 for the periods ended December 31, 2014 and December 31, 2013, respectively.
	(2) Net of taxes of $50 and $110 for the periods ended December 31, 2014 and December 31, 2013, respectively.
	The changes in accumulated other comprehensive income (loss) by component for the year ended December 31, 2013 were as follows:
	(Dollars in thousands)	Foreign currency translation adjustments			Funded status of pension plans and other postretirement benefits (3)			Unrealized gain (loss) on derivative instruments (4)			Total
	Beginning Balance December 31, 2012	$	12,585		$	(70,158	)	$	(235	)	$	(57,808	)
	Other comprehensive income before reclassifications	10,171			—			(210		)	9,961
	Actuarial net gain (loss) incurred in the fiscal year	—			32,749			—			32,749
	Amounts reclassified from accumulated other comprehensive income	—			3,412			236			3,648
	Net current-period other comprehensive income	10,171			36,161			26			46,358
	Ending Balance December 31, 2013	$	22,756		$	(33,997	)	$	(209	)	$	(11,450	)
	(3) Net of taxes of $2,900 and $22,371 for the periods ended December 31, 2013 and December 31, 2012, respectively.
	(4) Net of taxes of $110 and $127 for the periods ended December 31, 2013 and December 31, 2012, respectively.
Reclassification out of accumulated other comprehensive income	The reclassifications out of accumulated other comprehensive income (loss) for the year ended December 31, 2014 were as follows:
	Details about accumulated other comprehensive income components	Amounts reclassified from accumulated other comprehensive income (loss) for the period ended December 31, 2014			Affected line item in the statement where net income is presented
	Unrealized gains and losses on derivative instruments:
		$	321		Realized gain (loss)
		(112		)	Tax benefit (expense)
		$	209		Net of tax
	Amortization of defined benefit pension and other post-retirement benefit items:
	Prior service costs	$	—		-5
	Actuarial losses	6,006			-5
		6,006			Total before tax
		(2,102		)	Tax benefit (expense)
		$	3,904		Net of tax
	(5) These accumulated other comprehensive income components are included in the computation of net periodic pension cost. See Note 9 - "Pension Benefits and Retirement Health and Life Insurance Benefits" for additional details.
	The reclassifications out of accumulated other comprehensive income (loss) for the year ended December 31, 2013 were as follows:
	Details about accumulated other comprehensive income components	Amounts reclassified from accumulated other comprehensive income (loss) for the period ended December 31, 2013			Affected line item in the statement where net income is presented
	Unrealized gains and losses on derivative instruments:
		$	363		Realized gain (loss)
		(127		)	Tax benefit (expense)
		$	236		Net of tax
	Amortization of defined benefit pension and other post-retirement benefit items:
	Prior service costs	$	1,431		-6
	Actuarial losses	3,819			-6
		5,250			Total before tax
		(1,838		)	Tax benefit (expense)
		$	3,412		Net of tax
	(6) These accumulated other comprehensive income components are included in the computation of net periodic pension cost. See Note 9 - "Pension Benefits and Other Postretirement Benefit Plans" for additional details.

Property_Plant_and_Equipment_T

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Schedule of property, plant and equipment	For financial reporting purposes, provisions for depreciation are calculated on a straight‑line basis over the following estimated useful lives of the underlying assets:
		Years
	Buildings and improvements	15-Oct
	Machinery and equipment	15-May
	Office equipment	10-Mar
	(Dollars in thousands)	December 31,			December 31,
		2014			2013
	Land	$	14,045		$	14,986
	Buildings and improvements	132,105			136,959
	Machinery and equipment	165,979			160,843
	Office equipment	36,810			34,972
	Equipment in process	26,573			21,360
		375,512			369,120
	Accumulated depreciation	(225,092		)	(222,189		)
	Total property, plant and equipment, net	$	150,420		$	146,931

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets
	(Dollars in thousands)	December 31, 2014								December 31, 2013
		Gross Carrying Amount			Accumulated Amortization		Net Carrying Amount			Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Trademarks and patents	$	1,046		$	364	$	682		$	1,075	$	303		$	772
	Technology	33,942			15,958		17,984			37,825		13,340			24,485
	Covenant-not-to-compete	1,016			823		193			1,056		628			428
	Customer relationships	19,123			4,406		14,717			21,280		3,235			18,045
	Total other intangible assets	$	55,127		$	21,551	$	33,576		$	61,236	$	17,506		$	43,730
Weighted average amortization period, by intangible asset class	The weighted average amortization period as of December 31, 2014, by intangible asset class, is presented in the table below:
	Intangible Asset Class		Weighted Average Amortization Period
	Trademarks and patents		7.6
	Technology		4.7
	Covenant not-to-compete		2
	Customer relationships		7.4
	Total other intangible assets		5.9
Changes in the carrying amount of goodwill, by segment	The changes in the carrying amount of goodwill for the period ending December 31, 2014, by reportable segment, were as follows:
	(Dollars in thousands)	High Performance Foams			Printed Circuit Materials		Power Electronics Solutions			Other		Total
	December 31, 2013	$	24,205		$	—	$	82,242		$	2,224	$	108,671
	Foreign currency translation adjustment	(640		)	—		(9,804		)	—		(10,444		)
	December 31, 2014	$	23,565		$	—	$	72,438		$	2,224	$	98,227

Summarized_Financial_Informati1

Summarized Financial Information of Unconsolidated Joint Ventures (Tables)	12 Months Ended
	Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]
Joint ventures accounted for under equity method of accounting
	Joint Venture	Location	Reportable Segment	Fiscal Year-End
	Rogers INOAC Corporation (RIC)	Japan	High Performance Foams	October 31
	Rogers INOAC Suzhou Corporation (RIS)	China	High Performance Foams	December 31
Summarized information for joint ventures	The summarized financial information for the joint ventures for the periods indicated is as follows:
	(Dollars in thousands)	31-Dec-14			31-Dec-13
	Current assets	$	31,155		$	32,033
	Noncurrent assets	9,427			10,303
	Current liabilities	6,473			5,943
	Shareholders' equity	34,109			36,393
	(Dollars in thousands)	For the years then ended:
		December 31,			December 31,		December 31,
		2014			2013		2012
	Net sales	$	48,259		$	52,982	$	63,297
	Gross profit (loss)	14,277			15,214		17,280
	Net income (loss)	8,246			8,652		9,486

Pension_Benefit_and_Retirement1

Pension Benefit and Retirement Health and Life Insurance Benefits (Tables)	12 Months Ended
	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Change in benefit obligation
	(Dollars in thousands)	Pension Benefits								Retirement Health and Life Insurance Benefits
	Change in benefit obligation:	2014			2013					2014			2013
	Benefit obligation at beginning of year	$	174,325		$	209,844				$	10,824		$	11,891
	Service cost	—			2,473					556			627
	Interest cost	8,015			7,753					305			262
	Actuarial (gain) loss	34,006			(15,834		)			(1,071		)	(1,205		)
	Benefit payments	(24,934		)	(7,276		)			(775		)	(751		)
	Settlement charge	—			—					—			—
	Special termination benefit	(3,530		)	(22,635		)			—			—
	Benefit obligation at end of year	$	187,882		$	174,325				$	9,839		$	10,824
Change in plan assets
	Change in plan assets:	2014			2013					2014			2013
	Fair value of plan assets at the beginning of the year	$	171,218		$	143,540				$	—		$	—
	Actual return on plan assets	10,445			21,954					—			—
	Employer contributions	13,871			13,000					775			751
	Benefit payments	(24,934		)	(7,276		)			(775		)	(751		)
	Fair value of plan assets at the end of the year	170,600			171,218					—			—
	Funded status	$	(17,282	)	$	(3,107	)			$	(9,839	)	$	(10,824	)
Amounts recognized in consolidated balance sheet	Amounts recognized in the consolidated statements of financial position consist of:
	(Dollars in thousands)	Pension Benefits								Retirement Health and Life Insurance Benefits
		2014			2013					2014			2013
	Noncurrent assets	$	404		$	2,983				$	—		$	—
	Current liabilities	(34		)	(654		)			(1,071		)	(1,175		)
	Noncurrent liabilities	(17,652		)	(5,436		)			(8,768		)	(9,649		)
	Net amount recognized at end of year	$	(17,282	)	$	(3,107	)			$	(9,839	)	$	(10,824	)
Schedule of net periodic benefit cost not yet recognized
	(Dollars in thousands)	Pension Benefits				Retirement Health and Life Insurance Benefits
		2014				2014
	Net actuarial loss	$	62,053			$	707
	Prior service cost	—				—
	Net amount recognized at end of year	$	62,053			$	707
Components of net periodic benefit cost	Components of Net Periodic Benefit Cost
	(Dollars in thousands)	Pension Benefits													Postretirement Health and Life Insurance Benefits
		2014				2013				2012					2014		2013			2012
	Service cost	$	—			$	2,473			$	4,596				$	556	$	627		$	630
	Interest cost	8,015				7,753				8,420					305		262			364
	Expected return of plan assets	(12,909		)		(11,247		)		(9,892		)			—		—			—
	Amortization of prior service cost	—				124				463					—		(230		)	(451		)
	Amortization of net loss	686				3,615				5,471					—		204			313
	Settlement charge/(credit)	5,321				—				2,073					—		—			—
	Special termination benefit	—				—				—					—		—			1,592
	Curtailment charge	—				1,537				—					—		—			—
	Net periodic benefit cost	$	1,113			$	4,255			$	11,131				$	861	$	863		$	2,448
Schedule of weighted-average assumptions used	Weighted-average assumptions used to determine benefit obligations at December 31:
		Pension Benefits						Retirement Health and Life Insurance Benefits
		2014		2013				2014		2013
	Discount rate	4	%	4.75	%			3	%	3.25	%
	Expected long-term rate of return on plan assets	6.5	%	7.5	%			—		—
	Weighted-average assumptions used to determine net benefit cost for the years ended:
		Pension Benefits						Retirement Health and Life Insurance Benefits
		2014		2013				2014		2013
	Discount rate	4.75	%	4	%			3.25	%	2.5	%
	Expected long-term rate of return on plan assets	7.5	%	7.5	%			—		—
	Rate of compensation increase	4	%	4	%			—		—
Schedule of effect of one-percentage-point change in assumed health care cost trend rates	A one-percentage point change in assumed health care cost trend rates would have the following effects:
	(Dollars in thousands)	One Percentage Point
		Increase				Decrease
	Effect on total service and interest cost	$	60			$	527
	Effect on other postretirement benefit obligations	(55		)		(495		)
Schedule of allocation of plan assets	The following table presents the fair value of the net assets by asset category at December 31, 2014 and 2013:
	(Dollars in thousands)	2014				2013
	Pooled separate accounts	$	5,204			$	38,584
	Fixed income bonds	102,535				—
	Mutual funds	51,097				119,277
	Guaranteed deposit account	11,764				13,357
	Total investments at fair value	$	170,600			$	171,218
	The following tables set forth by level, within the fair value hierarchy, the assets carried at fair value as of December 31, 2014 and 2013.
		Assets at Fair Value as of December 31, 2014
	(Dollars in thousands)	Level 1				Level 2				Level 3				Total
	Pooled separate accounts	$	—			$	5,204			$	—			$	5,204
	Fixed income bonds	—				102,535				—				102,535
	Mutual funds	51,097				—				—				51,097
	Guaranteed deposit account	—				—				11,764				11,764
	Total assets at fair value	$	51,097			$	107,739			$	11,764			$	170,600
		Assets at Fair Value as of December 31, 2013
	(Dollars in thousands)	Level 1				Level 2				Level 3				Total
	Pooled separate accounts	$	—			$	38,584			$	—			$	38,584
	Mutual funds	119,277				—				—				119,277
	Guaranteed deposit account	—				—				13,357				13,357
	Total assets at fair value	$	119,277			$	38,584			$	13,357			$	171,218
Changes in fair value of Level 3 assets	The table below sets forth a summary of changes in the fair value of the guaranteed deposit account's Level 3 assets for the year ended December 31, 2014.
	(Dollars in thousands)	Guaranteed Deposit Account
	Balance at beginning of year	$	13,357
	Realized gains (losses)	—
	Unrealized gains relating to instruments still held at the reporting date	785
	Purchases, sales, issuances and settlements (net)	(2,378		)
	Transfers in and/or out of Level 3	—
	Balance at end of year	$	11,764
Schedule of future benefit payments	The following pension benefit payments, which reflect expected future employee service, as appropriate, are expected to be paid through the utilization of plan assets for the funded plans and from operating cash flows for the unfunded plans. The Retiree Health and Life Insurance benefits, for which no funding has been made, are expected to be paid from operating cash flows. The benefit payments are based on the same assumptions used to measure our benefit obligation at the end of fiscal 2014.
		Pension Benefits				Retiree Health and Life Insurance Benefits
	2015	$	8,126			$	1,071
	2016	$	8,125			$	1,052
	2017	$	8,355			$	1,017
	2018	$	8,621			$	994
	2019	$	8,944			$	1,038
	2020-2024	$	50,043			$	5,839

Debt_Tables

Debt (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Aggregate mandatory payments due by year
	2014	$17.50	million
	2015	$35.00	million
	2016	$25.00	million
Fixed charge metrics	Further, we are required to maintain certain financial covenant ratios, including (i) a leverage ratio of no more than 3.0 to 1.0 and (ii) a minimum fixed charge coverage ratio (FCCR) as defined in the following table:
	Period	Ratio
	March 31, 2013 to December 31, 2013	1.50 : 1.00
	March 31, 2014 and thereafter	1.75 : 1.00
	Relevant Fixed Charge metrics are detailed in the table below:
	Periods	Q4 2013		Q1 2014	Q2 2014	Q3 2014	Q4 2014
	Covenant Limit (minimum)	1.5		1.75	1.75	1.75	1.75
	Actual FCCR	2.39		2.69	2.65	2.7	2.58

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Consolidated income (loss) from continuing operations before income taxes by location	Consolidated income (loss) from continuing operations before income taxes consists of:
	(Dollars in thousands)	2014			2013			2012
	Domestic	$	61,446		$	13,208		$	6,260
	International	18,964			35,677			16,390
	Total	$	80,410		$	48,885		$	22,650
Income tax expense (benefit) by location	The income tax expense (benefit) in the consolidated statements of income (loss) consists of:
	(Dollars in thousands)	Current			Deferred			Total
	2014
	Domestic	$	2,205		$	6,699		$	8,904
	International	17,172			1,451			18,623
	Total	$	19,377		$	8,150		$	27,527
	2013
	Domestic	$	(7,075	)	$	5,894		$	(1,181	)
	International	12,667			(260		)	12,407
	Total	$	5,592		$	5,634		$	11,226
	2012
	Domestic	$	3,651		$	(59,414	)	$	(55,763	)
	International	8,118			1,161			9,279
	Total	$	11,769		$	(58,253	)	$	(46,484	)
Deferred tax assets and liabilities	Deferred tax assets and liabilities as of December 31, 2014 and 2013, were comprised of the following:
	(Dollars in thousands)
		2014			2013
	Deferred tax assets
	Accrued employee benefits and compensation	$	9,168		$	9,350
	Postretirement benefit obligations	7,866			2,860
	Tax loss and credit carryforwards	16,533			15,041
	Reserves and accruals	7,092			6,908
	Depreciation and amortization	17,862			21,496
	Other	2,550			3,772
	Total deferred tax assets	61,071			59,427
	Less deferred tax asset valuation allowance	(7,691		)	(7,302		)
	Total deferred tax assets, net of valuation allowance	53,380			52,125
	Deferred tax liabilities
	Investment in joint ventures, net	—			—
	Depreciation and amortization	14,303			15,839
	Other	344			238
	Total deferred tax liabilities	14,647			16,077
	Net deferred tax asset	$	38,733		$	36,048
Effective income tax rate reconciliation	Income tax expense differs from the amount computed by applying the United States federal statutory income tax rate to income before income taxes. The reasons for this difference are as follows:
	(Dollars in thousands)	2014			2013			2012
	Tax expense at Federal statutory income tax rate	$	28,144		$	17,110		$	7,928
	International tax rate differential	(6,772		)	(2,541		)	(209		)
	Foreign source income, net of tax credits	5,195			(786		)	(3,428		)
	Unrecognized tax benefits	603			(2,197		)	1,604
	General business credits	(604		)	(702		)	—
	Acquisition related expenses	590			—			—
	Valuation allowance change	388			—			(52,650		)
	Other	(17		)	342			271
	Income tax expense (benefit)	$	27,527		$	11,226		$	(46,484	)
Reconciliation of unrecognized tax benefits	A reconciliation of unrecognized tax benefits, excluding potential interest and penalties, for the years ending December 31, 2014 and December 31, 2013, is as follows:
	(Dollars in thousands)
		2014			2013
	Beginning balance	$	9,148		$	17,333
	Gross increases - current period tax positions	1,763			1,445
	Gross increases - tax positions in prior periods	335			—
	Gross decreases - tax positions in prior periods	—			(7,136		)
	Foreign currency exchange	(230		)	79
	Lapse of statute of limitations	(1,648		)	(2,573		)
	Ending balance	$	9,368		$	9,148

Shareholders_Equity_and_Stock_1

Shareholders' Equity and Stock Options (Tables)	12 Months Ended
	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of capital stock reserved for possible future issuance	Shares of capital stock reserved for possible future issuance are as follows:
		31-Dec-14			31-Dec-13
	Stock acquisition program	120,883			120,883
	Stock options and restricted stock	862,040			1,328,414
	Shares available for issuance	1,176,882			479,307
	Rogers Employee Savings and Investment Plan	169,044			169,044
	Rogers Corporation Global Stock Ownership Plan for Employees	166,152			181,617
	Deferred compensation to be paid in stock	13,248			14,558
	Total	2,508,249			2,293,823
Weighted average assumptions used to calculate fair value of options granted
			December 31,
			2012
	Options granted		46,950
	Weighted average exercise price		$	41.27
	Weighted-average grant date fair value		19.08
	Assumptions:
	Expected volatility		47.7		%
	Expected term (in years)		5.9
	Risk-free interest rate		1.43		%
	Expected dividend yield		—
Activity under our stock option plans	A summary of the activity under our stock option plans for the fiscal years ended 2014, 2013 and 2012, is presented below:
		2014						2013					2012
					Weighted-						Weighted-				Weighted-
					Average						Average				Average
		Options			Exercise Price			Options			Exercise Price		Options		Exercise Price
		Outstanding			Per Share			Outstanding			Per Share		Outstanding		Per Share
	Outstanding at beginning of year	893,139			$	43.23		1,765,947			$	40.58	2,401,809		$	37.54
	Options granted	—			—			—			—		46,950		41.27
	Options exercised	(476,793	)		44.6			(847,340	)		37.82		(614,263	)	42.97
	Options cancelled	(22,999	)		57.07			(25,468	)		39.04		(68,549	)	43.57
	Outstanding at year-end	393,347			40.72			893,139			43.23		1,765,947		40.58
	Options exercisable at year-end	364,770						721,645					1,274,340
	A summary of the activity under our stock option plans as of December 31, 2014 and changes during the year then ended, is presented below:
		Options Outstanding			Weighted- Average Exercise Price Per Share			Weighted-Average Remaining Contractual Life in Years		Aggregate Intrinsic Value
	Options outstanding at December 31, 2013	893,139			$	43.23		3.9		16,403,816
	Options granted	—			—
	Options exercised	(476,793	)		44.6
	Options cancelled	(22,999	)		57.07
	Options outstanding at December 31, 2014	393,347			40.72			3.8		16,019,130
	Options exercisable at December 31, 2014	364,770			40.13			3.4		15,069,704
	Options vested at December 31, 2014 or expected to vest*	392,490			40.7			3.8		15,990,648
	* In addition to the vested options, we expect a portion of the unvested options to vest at some point in the future. Options expected to vest are calculated by applying an estimated forfeiture rate to the unvested options.
Schedule of weighted-average assumptions used	Weighted-average assumptions used to determine benefit obligations at December 31:
		Pension Benefits					Retirement Health and Life Insurance Benefits
		2014		2013			2014		2013
	Discount rate	4	%	4.75	%		3	%	3.25	%
	Expected long-term rate of return on plan assets	6.5	%	7.5	%		—		—
	Weighted-average assumptions used to determine net benefit cost for the years ended:
		Pension Benefits					Retirement Health and Life Insurance Benefits
		2014		2013			2014		2013
	Discount rate	4.75	%	4	%		3.25	%	2.5	%
	Expected long-term rate of return on plan assets	7.5	%	7.5	%		—		—
	Rate of compensation increase	4	%	4	%		—		—
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of weighted-average assumptions used	Below are the assumptions used in the Monte Carlo calculation:
		2014			2013
	Expected volatility	33.7	%		37.1	%
	Expected term (in years)	3			3
	Risk-free interest rate	0.67	%		0.4	%
	Expected dividend yield	—			—
Schedule of of restricted stock and restricted stock activity	A summary of activity under the performance-based restricted stock plans for the fiscal years ended 2014, 2013 and 2012 is presented below:
		2014						2013					2012
		Awards Outstanding			Weighted-			Awards Outstanding			Weighted-		Awards Outstanding		Weighted-
					Average						Average				Average
					Grant Date Fair Value						Grant Date Fair Value				Grant Date Fair Value
	Non-vested awards outstanding at beginning of year	71,175			$	47.49		73,458			$	38.01	101,730		$	31.19
	Awards granted	51,850			58.61			47,625			47.1		22,120		41.27
	Stock issued	(14,383	)		47.89			(33,538	)		27.43		(43,750	)	23.86
	Awards forfeited or expired	(16,205	)		52.71			(16,370	)		44.9		(6,642	)	37.67
	Non-vested awards outstanding at end of year	92,437			$	52.75		71,175			$	47.49	73,458		$	38.01
Time Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of of restricted stock and restricted stock activity
		2014						2013					2012
		Awards Outstanding			Weighted-			Awards Outstanding			Weighted-		Awards Outstanding		Weighted-Average Grant Date Fair Value
					Average						Average
					Grant Date Fair Value						Grant Date Fair Value
	Non-vested awards outstanding at beginning of year	231,026			$	48.54		115,139			$	43.27	86,707		$	44.55
	Awards granted	93,780			61.7			156,665			51.78		51,790		40.99
	Stock issued	(62,378	)		47.19			(12,436	)		43.97		(16,620	)	41.64
	Awards forfeited or expired	(24,042	)		51.19			(28,342	)		47.07		(6,738	)	46.21
	Non-vested awards outstanding at end of year	238,386			$	53.8		231,026			$	48.54	115,139		$	43.27
Deferred Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of of restricted stock and restricted stock activity
		2014						2013					2012
		Awards Outstanding			Weighted-			Awards Outstanding			Weighted-		Awards Outstanding		Weighted-Average Grant Date Fair Value
					Average						Average
					Grant Date Fair Value						Grant Date Fair Value
	Non-vested awards outstanding at beginning of year	31,550			$	26.77		30,150			$	26.13	27,350		$	28.8
	Awards granted	14,700			58.45			16,800			41.67		17,600		38.64
	Stock issued	(16,100	)		60.08			(15,400	)		41.77		(14,800	)	45.95
	Non-vested awards outstanding at end of year	30,150			$	24.43		31,550			$	26.77	30,150		$	26.13

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Operating and capital leases
		Lease / Depreciation Expense
	(Dollars in thousands)	2014			2013			2012
	Operating leases	$	2,716		$	2,634		$	2,655
	Capital lease	743			1,233			1,627
Future minimum lease payments for operating and capital leases
		Future Minimum Lease Payments
	(Dollars in thousands)		2015			2016			2017		2018		2019
	Operating leases		$	2,329		$	1,631		$	1,112	$	827	$	108
	Capital lease		743			743			743		743		743
	(Dollars in thousands)	Operating Leases			Capital Lease
	Total future minimum lease payments	$	6,080		$	4,827

Business_Segment_and_Geographi1

Business Segment and Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Reportable segment information	This segment previously included the results of the Composite Materials operating segment, which qualified as a discontinued operation in the fourth quarter of 2012 when we shut down production of non-woven composite materials. All results have been recast to exclude this segment from consolidated results or continuing operations.
	The fol
Revenue and long-lived assets by geographic region	Information relating to our operations by geographic area is as follows:
		Net Sales (1)						Long-lived Assets (2)
	(Dollars in thousands)	2014		2013		2012		2014		2013		2012
	United States	$	128,186	$	118,263	$	115,035	$	70,532	$	64,545	$	64,845
	Asia	324,643		275,969		250,682		71,661		68,613		69,830
	Europe	148,026		132,126		123,040		144,794		171,615		172,671
	Other	10,056		11,124		10,004		—		—		—
	Total	$	610,911	$	537,482	$	498,761	$	286,987	$	304,773	$	307,346
	(1)    Net sales are allocated to countries based on the location of the customer.
	(2)    Long-lived assets are based on the location of the asset and are comprised of goodwill and other intangibles and property, plant and equipment.

Restructuring_and_Impairment_C1

Restructuring and Impairment Charges (Tables)	12 Months Ended
	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
Restructuring and impairment charges	The following table summarizes the restructuring and impairment charges related to these activities recorded in our operating results in 2014, 2013 and 2012.
	(Dollars in thousands)
		31-Dec-14			31-Dec-13		31-Dec-12
	Cost of Sales
	High Performance Foams
	Accelerated depreciation expense related to Bremen shut-down	$	—		$	—	$	764
	Inventory impairment related to Bremen shut-down	—			—		191
	Union ratification bonus	—			181		—
	Printed Circuit Materials
	Union ratification bonus	—			179		—
	Power Electronics Solutions
	Accelerated depreciation related to certain assets	—			—		393
	Accelerated depreciation expense related to U.S. shut-down	—			—		499
	Union ratification bonus	—			8		—
	Total charges for Cost of Sales	$	—		$	368	$	1,847
	Restructuring and Impairment
	High Performance Foams
	Pension settlement charge	1,332			—		—
	Fixed asset disposal (1)	—			—		79
	Severance related to Bremen shut-down	—			—		861
	Bremen shut down-costs	—			—		1,442
	Allocated severance and related costs	—			1,345		2,188
	Allocated Solicore impairment	42			1,617		—
	Printed Circuit Materials
	Pension settlement charge	1,954			—		—
	Allocated severance and related costs	—			802		2,915
	Allocated Solicore impairment	62			1,617		—
	Power Electronics Solutions
	Pension settlement charge	1,921			—		—
	Impairment of investment related receivable	—			—		264
	Severance and related costs	—			3,494		1,799
	Severance related to Hungary move	—			—		3,774
	PDS North America shut-down costs	—			—		149
	Allocated Solicore impairment	61			1,155		—
	Other
	Pension settlement charge	17			—		—
	License agreement expense	—			—		356
	Allocated severance and related costs	—			115		255
	Allocated Solicore impairment	1			231		—
	Total charges for Restructuring and Impairment	$	5,390		$	10,376	$	14,082
	(1) In the first quarter of 2012, we signed an agreement to sell our facility in Richmond, Virginia for $1.5 million. This facility had a book value of approximately $1.8 million prior to the signing of the agreement, and we recorded an impairment charge of approximately $0.4 million as of December 31, 2011, which represented the write down to the selling price minus approximately $0.1 million of estimated selling costs. The transaction closed in the second quarter of 2012.
Components of severance accrual	The following table summarizes charges in the severance accrual from January 1, 2014 through December 31, 2014:
	(Dollars in thousands)	Streamlining and restructuring related activities			Bremen facility shut down		Curamik finishing operations relocation to Hungary		Total
	Balance at January 1, 2014	$	695		$	—	$	—	$	695
	Provisions				—		—		—
	Payments	(695		)	—		—		(695		)
	Balance at December 31, 2014	$	—		$	—	$	—	$	—
	Balances may differ from prior periods due to foreign exchange rate fluctuations.

Quarterly_Results_of_Operation1

Quarterly Results of Operations (UNAUDITED) (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Quarterly financial information
	(Dollars in thousands, except per share amounts)	2014
		First		Second		Third		Fourth
		Quarter		Quarter		Quarter		Quarter
	Net sales	$	146,640	$	153,495	$	163,052	$	147,724
	Gross margin	53,919		57,138		64,548		58,335
	Income (loss) from continuing operations	14,580		10,902		20,388		7,013
	Net income per share:
	Basic	$	0.81	$	0.6	$	1.12	$	0.38
	Diluted	0.79		0.58		1.09		0.37
		2013
		First		Second		Third		Fourth
		Quarter		Quarter		Quarter		Quarter
	Net sales	$	125,979	$	132,452	$	142,820	$	136,231
	Gross margin	41,289		44,429		51,186		50,796
	Income (loss) from continuing operations	6,976		5,583		13,572		11,528
	Net income per share:
	Basic	$	0.41	$	0.33	$	0.79	$	0.66
	Diluted	0.39		0.32		0.76		0.64

Organization_and_Summary_of_Si3

Organization and Summary of Significant Accounting Policies (Additional Information) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	category
Accounting Policies [Abstract]
Currency transaction adjustment gain (loss)	$0	$0.70	$0.80
Categories of intangible assets	3
Advertising expense	$3.30	$2.90	$2

Organization_and_Summary_of_Si4

Organization and Summary of Significant Accounting Policies (Cash Equivalents) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2012
Accounting Policies [Abstract]
Original Maturities of three months or less	3 months
High Performance Foams [Member] | Facility Closing [Member] | Bremen facility shut-down [Member]
Restructuring Cost and Reserve [Line Items]
Restricted Cash and Cash Equivalents		$1

Organization_and_Summary_of_Si5

Organization and Summary of Significant Accounting Policies (Investments in Unconsolidated Joint Ventures) (Details) (Rogers INOAC Corporation [Member])	Dec. 31, 2014
Rogers INOAC Corporation [Member]
Schedule of Equity Method Investments [Line Items]
Joint venture ownership percentage	50.00%

Organization_and_Summary_of_Si6

Organization and Summary of Significant Accounting Policies (Inventories) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
LIFO Inventory Amount	$12,500,000	$12,700,000
Percentage of LIFO Inventory	24.00%	25.00%
Inventory, LIFO Reserve, Effect on Income, Net	8,200,000	7,400,000
Inventory, Gross [Abstract]
Raw Materials	26,787,000	24,301,000
Work in Process	16,564,000	13,536,000
Finished Goods	25,277,000	29,052,000
Total Inventory	$68,628,000	$66,889,000

Organization_and_Summary_of_Si7

Organization and Summary of Significant Accounting Policies (Property, Plant and Equipment Estimated Useful Lives) (Details)	12 Months Ended
	Dec. 31, 2014
Building and improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life	10 years
Building and improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life	15 years
Machinery and equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life	5 years
Machinery and equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life	15 years
Office equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life	3 years
Office equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life	10 years

Organization_and_Summary_of_Si8

Organization and Summary of Significant Accounting Policies (Software Costs) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Capitalized Computer Software, Net [Abstract]
Software amortization expense	$0
Net capitalized software and development costs	$3.40

Organization_and_Summary_of_Si9

Organization and Summary of Significant Accounting Policies (Environmental and Product Liabilities) (Details)	12 Months Ended
	Dec. 31, 2014
Loss Contingencies [Line Items]
Asbestos Forecast Claim Period	10 years

Recovered_Sheet1

Organization and Summary of Significant Accounting Policies (Concentration of Credit and Investment Risk) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
		customer	customer
Accounting Policies [Abstract]
Number of customers that individually accounted for more than ten percent of accounts receivable		0	0
Amount of significant credit losses experienced on customer accounts	$0	$0	$0
Concentration Risk, Percentage	10.00%

Recovered_Sheet2

Organization and Summary of Significant Accounting Policies (Earning Per Share) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Income (loss) from continuing operations, net of tax	$7,013	$20,388	$10,902	$14,580	$11,528	$13,572	$5,583	$6,976	$52,883	$37,659	$69,134
Weighted-average shares outstanding - basic									18,177,178	17,197,840	16,426,209
Effect of dilutive stock options (in shares)									520,600	570,235	564,949
Denominator for diluted earnings per share - Adjusted weighted-average shares and assumed conversions (shares)									18,697,778	17,768,075	16,991,158
Net income per basic share (in dollars per share)	$0.38	$1.12	$0.60	$0.81	$0.66	$0.79	$0.33	$0.41	$2.91	$2.19	$4.21
Net income per diluted share (in dollars per share)	$0.37	$1.09	$0.58	$0.79	$0.64	$0.76	$0.32	$0.39	$2.83	$2.12	$4.07
Antidilutive securities excluded from computation of earnings per share (shares)									0	0	68,000

Recovered_Sheet3

Organization and Summary of Significant Accounting Policies (Equity Compensation) (Details)	12 Months Ended
	Dec. 31, 2014
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Of Years	4 years
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Of Years	3 years

Fair_Value_Measurements_Variou

Fair Value Measurements (Various Instruments That Require Fair Value Measurement) (Detail) (Fair Value, Recurring [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pension assets	$170,600	$171,218
Foreign currency contracts	-18	-77
Copper derivative contracts	355	984
Interest rate swap	-144	-296
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pension assets	51,097	119,277
Foreign currency contracts	0	0
Copper derivative contracts	0	0
Interest rate swap	0	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pension assets	107,739	38,584
Foreign currency contracts	-18	-77
Copper derivative contracts	355	984
Interest rate swap	-144	-296
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pension assets	11,764	13,357
Foreign currency contracts	0	0
Copper derivative contracts	0	0
Interest rate swap	$0	$0

Fair_Value_Measurements_Assets

Fair Value Measurements (Assets Held For Sale) (Details) (Fair Value, Nonrecurring [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets of discontinued operations	$341
Solicore investment [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of year	507
Cash investment	0
Impairment reported in earnings	-166
Balance at end of year	341
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets of discontinued operations	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets of discontinued operations	0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets of discontinued operations	$341

Fair_Value_Measurements_Additi

Fair Value Measurements (Additional Information) (Detail) (Auction Rate Securities [Member], USD $)	3 Months Ended
	Mar. 31, 2012
Auction Rate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net proceeds from liquidation of auction rate security	$25,400,000
Par value of auction rate securities redeemed	29,500,000
Loss on liquidation of the securities	-3,200,000
Impairment on auction rate securities	$900,000

Hedging_Transactions_and_Deriv2

Hedging Transactions and Derivative Financial Instruments (Additional Information) (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Jul. 13, 2011	Jul. 31, 2013	Jul. 31, 2012
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Term loan debt		$100
Interest rate spread over variable rate	1.75%
Bank Term Loan [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Number of derivative contracts related to minimizing risk associated with potential rise in copper prices	16
Term loan debt	60
Variable interest rate	0.19%
Interest rate spread over variable rate	1.75%
Bank Term Loan [Member] | Cash Flow Hedging [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Interest rate swap derivative, percentage of debt hedged			65.00%	65.00%

Hedging_Transactions_and_Deriv3

Hedging Transactions and Derivative Financial Instruments (Notional Values of Derivative Instruments) (Detail)	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014
	Copper Derivative Instruments [Member]	Copper Derivative Instruments [Member]	Copper Derivative Instruments [Member]	Copper Derivative Instruments [Member]	Copper Derivative Instruments [Member]	Foreign Currency Derivative Instruments [Member]	Foreign Currency Derivative Instruments [Member]	Foreign Currency Derivative Instruments [Member]	Foreign Currency Derivative Instruments [Member]	Foreign Currency Derivative Instruments [Member]
	Copper January 2015 - March 2015 [Member]	Copper April 2015 - June 2015 [Member]	Copper July 2015 - September 2015 [Member]	Copper October 2015 - December 2015 [Member]	Copper January 2016 - March 2016 [Member]	YEN/USD Notional Amount of Foreign Currency Derivatives [Member]	USD/KRW Notional Amount of Foreign Currency Derivatives [Member]	YEN/EUR Notional Amount of Foreign Currency Derivatives [Member]	HUF/EUR Notional Amount of Foreign Currency Derivatives [Member]	CNY/USD Notional Amount of Foreign Currency Derivatives [Member]
						JPY (¥)	KRW	JPY (¥)	HUF	CNY
Derivative [Line Items]
Notional Value of Copper Derivatives	156	150	135	123	30
Notional Values of Foreign Currency Derivatives						¥ 200,000,000	1,854,700,000	¥ 315,000,000	50,000,000	134,000,000

Hedging_Transactions_and_Deriv4

Hedging Transactions and Derivative Financial Instruments (Effect and Fair Value of Derivative Instruments) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Other income, net [Member] | Foreign Exchange Option Contracts [Member]
Derivative [Line Items]
Foreign Exchange Contracts, Not designated as hedging instruments, Amount of gain (loss)	($19)	($79)
Foreign Exchange Contracts, Not designated as hedging instruments, Other assets (liabilities)	-19	-79
Other income, net [Member] | Copper Derivative Instruments [Member]
Derivative [Line Items]
Copper Derivative Instruments, Not designated as hedging instruments, Amount of gain (loss)	-605	-373
Copper Derivative Instruments, Not designated as hedging instruments, Other assets (liabilities)	355	984
Other comprehensive income (loss) [Member] | Foreign Exchange Option Contracts [Member]
Derivative [Line Items]
Foreign Exchange Contracts, Designated as hedging instruments, Amount of gain (loss)		-24
Foreign Exchange Contracts, Designated as hedging instruments, Other assets (liabilities)		2
Other comprehensive income (loss) [Member] | Interest Rate Swap Instrument [Member]
Derivative [Line Items]
Foreign Exchange Contracts, Designated as hedging instruments, Amount of gain (loss)		-296
Interest Rate Swap Instrument, Designated as hedging instruments, Amount of gain (loss)	152
Interest Rate Swap Instrument, Designated as hedging instruments, Other assets (liabilities)	($144)	($296)

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income or Loss) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	($11,450)		($57,808)
Other comprehensive income before reclassifications	-37,042		9,961
Actuarial net gain (loss) incurred in fiscal year	-20,715		32,749		-6,687
Amounts reclassified from accumulated other comprehensive income	4,113		3,648
Net current-period other comprehensive income	-53,644		46,358
Ending balance	-65,094		-11,450		-57,808
AOCI, Pension and other postretirement benefit plans, tax	11,952		2,900		22,371
AOCI, Cumulative changes in net gain (loss) from cash flow hedges, tax	50		110		127
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	22,756		12,585
Other comprehensive income before reclassifications	-36,949		10,171
Actuarial net gain (loss) incurred in fiscal year	0		0
Amounts reclassified from accumulated other comprehensive income	0		0
Net current-period other comprehensive income	-36,949		10,171
Ending balance	-14,193		22,756
Funded status of pension plans and other postretirement benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	-33,997	[1],[2]	-70,158	[1]
Other comprehensive income before reclassifications	0	[2]	0	[1]
Actuarial net gain (loss) incurred in fiscal year	-20,715	[2]	32,749	[1]
Amounts reclassified from accumulated other comprehensive income	3,904	[2]	3,412	[1]
Net current-period other comprehensive income	-16,811	[2]	36,161	[1]
Ending balance	-50,808	[2]	-33,997	[1],[2]
Unrealized gain (loss) on derivative instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	-209	[3],[4]	-235	[3]
Other comprehensive income before reclassifications	-93	[4]	-210	[3]
Actuarial net gain (loss) incurred in fiscal year	0	[4]	0	[3]
Amounts reclassified from accumulated other comprehensive income	209	[4]	236	[3]
Net current-period other comprehensive income	116	[4]	26	[3]
Ending balance	($93)	[4]	($209)	[3],[4]
[1]	Net of taxes of $2,900 and $22,371 for the periods ended December 31, 2013 and December 31, 2012, respectively.
[2]	Net of taxes of $11,952 and $2,900 for the periods ended December 31, 2014 and December 31, 2013, respectively.
[3]	Net of taxes of $110 and $127 for the periods ended December 31, 2013 and December 31, 2012, respectively.
[4]	Net of taxes of $50 and $110 for the periods ended December 31, 2014 and December 31, 2013, respectively.

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Income (Loss) (Reclassification) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Realized gain (loss)									$0		$0		($3,245)
Income tax expense (benefit)									-27,527		-11,226		46,484
Income (loss) from continuing operations	7,013	20,388	10,902	14,580	11,528	13,572	5,583	6,976	52,883		37,659		69,134
Income (loss) before income taxes									80,410		48,885		22,650
Amounts reclassified from accumulated other comprehensive income (loss) for the period ended December 31, 2013 [Member] | Unrealized gain (loss) on derivative instruments [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Realized gain (loss)									321		363
Income tax expense (benefit)									-112		-127
Income (loss) from continuing operations									209		236
Amounts reclassified from accumulated other comprehensive income (loss) for the period ended December 31, 2013 [Member] | Amortization of defined benefit pension and other post-retirement benefit items: [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)									-2,102		-1,838
Income (loss) from continuing operations									3,904		3,412
Prior service costs									0	[1]	1,431	[2]
Actuarial losses									6,006	[1]	3,819	[2]
Income (loss) before income taxes									$6,006		$5,250
[1]	These accumulated other comprehensive income components are included in the computation of net periodic pension cost. See Note 9 - "Pension Benefits and Retirement Health and Life Insurance Benefits" for additional details.
[2]	These accumulated other comprehensive income components are included in the computation of net periodic pension cost. See Note 9 - "Pension Benefits and Other Postretirement Benefit Plans" for additional details.

Property_Plant_and_Equipment_S

Property, Plant and Equipment (Schedule of Plant Property and Equipment) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment [Abstract]
Land	$14,045	$14,986
Buildings and improvements	132,105	136,959
Machinery and equipment	165,979	160,843
Office equipment	36,810	34,972
Equipment in process	26,573	21,360
Property, Plant and Equipment, Gross	375,512	369,120
Accumulated depreciation	-225,092	-222,189
Total property, plant and equipment, net	$150,420	$146,931

Property_Plant_and_Equipment_A

Property, Plant and Equipment (Additional Information) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Abstract]
Depreciation	$20.10	$20.40	$22.70
Capital lease obligation	6.8	8		12.1
Amortization of leased asset	0.4	0.4	0.4
Capital leases accumulated depreciation	$1.60	$1.20

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets (Intangible Assets) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$55,127	$61,236
Accumulated Amortization	21,551	17,506
Net Carrying Amount	33,576	43,730
Trademarks and patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,046	1,075
Accumulated Amortization	364	303
Net Carrying Amount	682	772
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	33,942	37,825
Accumulated Amortization	15,958	13,340
Net Carrying Amount	17,984	24,485
Covenant not-to-compete [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,016	1,056
Accumulated Amortization	823	628
Net Carrying Amount	193	428
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	19,123	21,280
Accumulated Amortization	4,406	3,235
Net Carrying Amount	$14,717	$18,045

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets (Additional Information) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 04, 2011
Goodwill and Intangible Assets Disclosure [Line Items]
Amortization expense	$6,100,000	$6,000,000	$4,400,000
Estimated future amortization expense for 2015	5,300,000
Estimated future amortization expense for 2016	4,900,000
Estimated future amortization expense for 2017	4,500,000
Estimated future amortization expense for 2018	3,900,000
Estimated future amortization expense for 2019	3,400,000
Goodwill acquired	98,227,000	108,671,000
Annual Impairment Testing
Sensitivity analysis, Decline in fair value of segment, Percent	10.00%
High Performance Foams [Member]
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill acquired	23,565,000	24,205,000
Annual Impairment Testing
Fair value of goodwill in excess of carrying value, Percent	318.00%
Sensitivity analysis, Fair value of goodwill in excess of carrying value, Percent	277.00%
Sensitivity analysis, Discount rate used	13.00%
Sensitivity analysis, Terminal year growth rate	3.00%
Curamik Electronics Solutions [Member]
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill acquired	72,400,000
Annual Impairment Testing
Fair value of goodwill in excess of carrying value, Percent	85.00%
Sensitivity analysis, Fair value of goodwill in excess of carrying value, Percent	65.00%
Sensitivity analysis, Discount rate used	15.50%
Sensitivity analysis, Terminal year growth rate	3.00%
Elastomer Component Division [Member]
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill acquired	2,200,000
Annual Impairment Testing
Fair value of goodwill in excess of carrying value, Percent	77.00%
Sensitivity analysis, Fair value of goodwill in excess of carrying value, Percent	60.00%
Sensitivity analysis, Discount rate used	13.00%
Sensitivity analysis, Terminal year growth rate	3.00%
Curamik Electronics GmbH [Member]
Goodwill and Intangible Assets Disclosure [Line Items]
Intangible assets acquired				52,400,000
Goodwill acquired				79,800,000
Trademarks acquired				$5,300,000

Goodwill_and_Intangible_Assets4

Goodwill and Intangible Assets (Weighted Average Amortization Period by Intangible Asset Class) (Detail)	12 Months Ended
	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	5 years 10 months 24 days
Trademarks and patents [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	7 years 7 months 6 days
Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	4 years 8 months 12 days
Covenant not-to-compete [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	2 years
Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	7 years 4 months 24 days

Goodwill_and_Intangible_Assets5

Goodwill and Intangible Assets (Changes in Carrying Amount of Goodwill by Segment) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Goodwill [Roll Forward]
31-Dec-13	$108,671
Foreign currency translation adjustment	-10,444
31-Dec-14	98,227
High Performance Foams [Member]
Goodwill [Roll Forward]
31-Dec-13	24,205
Foreign currency translation adjustment	-640
31-Dec-14	23,565
Advanced Connectivity Solutions [Member]
Goodwill [Roll Forward]
31-Dec-13	0
Foreign currency translation adjustment	0
31-Dec-14	0
Power Electronics Solutions [Member]
Goodwill [Roll Forward]
31-Dec-13	82,242
Foreign currency translation adjustment	-9,804
31-Dec-14	72,438
Other [Member]
Goodwill [Roll Forward]
31-Dec-13	2,224
Foreign currency translation adjustment	0
31-Dec-14	$2,224

Summarized_Financial_Informati2

Summarized Financial Information of Unconsolidated Joint Ventures (Additional Information) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	joint_venture
Schedule of Equity Method Investments [Line Items]
Number of joint ventures that are 50% owned	2
Equity income in unconsolidated joint ventures	$4,123	$4,326	$4,743
Rogers INOAC Corporation [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest in joint venture	50.00%
Rogers INOAC Suzhou Corporation [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest in joint venture	50.00%

Summarized_Financial_Informati3

Summarized Financial Information of Unconsolidated Joint Ventures (Accounted for Under Equity Method of Accounting) (Detail)	12 Months Ended
	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Fiscal Year-End	-19
Rogers INOAC Corporation [Member] | Japan [Member] | High Performance Foams [Member]
Schedule of Equity Method Investments [Line Items]
Fiscal Year-End	-21
Rogers INOAC Suzhou Corporation [Member] | China [Member] | High Performance Foams [Member]
Schedule of Equity Method Investments [Line Items]
Fiscal Year-End	-19

Summarized_Financial_Informati4

Summarized Financial Information of Unconsolidated Joint Ventures (Assets, Liabilities, and Equity) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Equity Method Investments and Joint Ventures [Abstract]
Current assets	$31,155	$32,033
Noncurrent assets	9,427	10,303
Current liabilities	6,473	5,943
Shareholders' equity	$34,109	$36,393

Summarized_Financial_Informati5

Summarized Financial Information of Unconsolidated Joint Ventures (Sales, Profit, and Income) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Equity Method Investments and Joint Ventures [Abstract]
Net sales	$48,259	$52,982	$63,297
Gross profit (loss)	14,277	15,214	17,280
Net income (loss)	$8,246	$8,652	$9,486

Investment_Additional_Informat

Investment (Additional Information) (Details) (Solicore, Inc. [Member], USD $)	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2009	Mar. 31, 2013
Solicore, Inc. [Member]
Schedule of Investments [Line Items]
Investment in joint venture	$300,000	$500,000	$5,000,000	$100,000
Financing raised by investee			13,300,000
Impairment charge	$200,000	$4,600,000

Pension_Benefit_and_Retirement2

Pension Benefit and Retirement Health and Life Insurance Benefits (Additional Information) (Detail) (USD $)	3 Months Ended					12 Months Ended
	Dec. 31, 2014	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension and Other Postretirement Benefits Disclosure [Line Items]
Number of defined benefit pension plans	2					2
Projected benefit obligation of plan with accumulated benefit obligation in excess of plan assets	$155,200,000					$155,200,000	$144,300,000
Accumulated benefit obligation of plan with accumulated benefit obligation in excess of plan assets	155,200,000					155,200,000	144,300,000
Fair value of the plan assets of plan with accumulated benefit obligation in excess of plan assets	137,600,000					137,600,000	138,200,000
Projected benefit obligation of plan with plan assets in excess of accumulated benefit obligation	32,600,000					32,600,000	30,000,000
Accumulated benefit obligation of plan with plan assets in excess of accumulated benefit obligation	32,600,000					32,600,000	30,000,000
Fair value of the plan assets of plan with plan assets in excess of accumulated benefit obligation	33,000,000					33,000,000	33,000,000
Defined benefit plan, one-time cash payment				6,300,000
Change in discount rate						-0.75%
Discount rate						4.00%	4.80%
Health care cost trend rate annual change						-0.50%
Health care cost, employees age						65 years
Defined benefit pension plans, voluntary contributions						13,000,000	13,000,000
Estimated employer contributions in 2015						10,000,000
Equity Securities [Member]
Pension and Other Postretirement Benefits Disclosure [Line Items]
Plan asset allocations	23.00%					23.00%	60.00%
Debt Securities [Member]
Pension and Other Postretirement Benefits Disclosure [Line Items]
Plan asset allocations	77.00%					77.00%	40.00%
Retirees of 65 Years Old or Yonger [Member]
Pension and Other Postretirement Benefits Disclosure [Line Items]
Health care cost trend rate assumed for next fiscal year						7.50%	8.00%
Ultimate health care cost trend rate						4.50%
Retirees of 65 Years Old or Older [Member]
Pension and Other Postretirement Benefits Disclosure [Line Items]
Health care cost trend rate assumed for next fiscal year						7.50%	8.00%
Ultimate health care cost trend rate						4.50%
Retirement Health and Life Insurance Benefits [Member]
Pension and Other Postretirement Benefits Disclosure [Line Items]
Curtailment charges						0	0	0
Defined benefit plan, one-time cash payment						775,000	751,000
Net loss to be recognized over next twelve months						0
Settlement charge						0	0
Discount rate						3.25%	2.50%
Expected long-term rate of return on plan assets	0.00%					0.00%	0.00%
Defined benefit pension plans, voluntary contributions						775,000	751,000
Retirement Health and Life Insurance Benefits [Member] | Facility Closing [Member] | High Performance Foams [Member]
Pension and Other Postretirement Benefits Disclosure [Line Items]
Expenses and charges related to the termination of the operations			1,600,000					1,600,000
Pension Benefits [Member]
Pension and Other Postretirement Benefits Disclosure [Line Items]
Curtailment charges		1,500,000				0	-1,537,000	0
Defined benefit plan, one-time cash payment						24,934,000	7,276,000
Net loss to be recognized over next twelve months						1,700,000
Settlement charge	5,200,000			2,100,000		0
Discount rate						4.75%	4.00%
Expected long-term rate of return on plan assets	6.50%					6.50%	7.50%
Defined benefit pension plans, voluntary contributions					$0	$13,871,000	$13,000,000

Pension_Benefit_and_Retirement3

Pension Benefit and Retirement Health and Life Insurance Benefits (Obligations and Funded Status) (Details) (USD $)	3 Months Ended				12 Months Ended
	Dec. 31, 2014	Dec. 31, 2012	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit payments			($6,300,000)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Employer contributions					13,000,000	13,000,000
Benefit payments			-6,300,000
Pension Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year					174,325,000	209,844,000
Service cost					0	2,473,000	4,596,000
Interest cost					8,015,000	7,753,000	8,420,000
Actuarial (gain) loss					34,006,000	-15,834,000
Benefit payments					-24,934,000	-7,276,000
Settlement charge	-5,200,000		-2,100,000		0
Special termination benefit					-3,530,000	-22,635,000
Benefit obligation at end of year	187,882,000	209,844,000			187,882,000	174,325,000	209,844,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at the beginning of the year					171,218,000	143,540,000
Actual return on plan assets					10,445,000	21,954,000
Employer contributions				0	13,871,000	13,000,000
Benefit payments					-24,934,000	-7,276,000
Settlement charge	-5,200,000		-2,100,000		0
Fair value of plan assets at the end of the year	170,600,000	143,540,000			170,600,000	171,218,000	143,540,000
Funded status	-17,282,000				-17,282,000	-3,107,000
Retirement Health and Life Insurance Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year					10,824,000	11,891,000
Service cost					556,000	627,000	630,000
Interest cost					305,000	262,000	364,000
Actuarial (gain) loss					-1,071,000	-1,205,000
Benefit payments					-775,000	-751,000
Settlement charge					0	0
Special termination benefit					0
Benefit obligation at end of year	9,839,000	11,891,000			9,839,000	10,824,000	11,891,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at the beginning of the year					0	0
Actual return on plan assets					0	0
Employer contributions					775,000	751,000
Benefit payments					-775,000	-751,000
Settlement charge					0	0
Fair value of plan assets at the end of the year	0	0			0	0	0
Funded status	($9,839,000)				($9,839,000)	($10,824,000)

Pension_Benefit_and_Retirement4

Pension Benefit and Retirement Health and Life Insurance Benefits (Amounts Recognized in Balance Sheet) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent assets	$403	$2,982
Pension Benefits [Member]
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent assets	404	2,983
Current liabilities	-34	-654
Noncurrent liabilities	-17,652	-5,436
Net amount recognized at end of year	-17,282	-3,107
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Net actuarial loss	62,053
Prior service cost	0
Net amount recognized at end of year	62,053
Retirement Health and Life Insurance Benefits [Member]
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent assets	0	0
Current liabilities	-1,071	-1,175
Noncurrent liabilities	-8,768	-9,649
Net amount recognized at end of year	-9,839	-10,824
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Net actuarial loss	707
Prior service cost	0
Net amount recognized at end of year	$707

Pension_Benefit_and_Retirement5

Pension Benefit and Retirement Health and Life Insurance Benefits (Components of Net Periodic Benefit Cost) (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		$0	$2,473	$4,596
Interest cost		8,015	7,753	8,420
Expected return of plan assets		-12,909	-11,247	-9,892
Amortization of prior service cost		0	124	463
Amortization of net loss		686	3,615	5,471
Settlement charge/(credit)		-5,321	0	-2,073
Special termination benefit		0	0	0
Curtailment charge	-1,500	0	1,537	0
Net periodic benefit cost		1,113	4,255	11,131
Retirement Health and Life Insurance Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		556	627	630
Interest cost		305	262	364
Expected return of plan assets		0	0	0
Amortization of prior service cost		0	-230	-451
Amortization of net loss		0	204	313
Settlement charge/(credit)		0	0	0
Special termination benefit		0	0	1,592
Curtailment charge		0	0	0
Net periodic benefit cost		$861	$863	$2,448

Pension_Benefit_and_Retirement6

Pension Benefit and Retirement Health and Life Insurance Benefits (Assumptions Used) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	4.00%	4.80%
Pension Benefits [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	4.00%	4.75%
Expected long-term rate of return on plan assets	6.50%	7.50%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	4.75%	4.00%
Expected long-term rate of return on plan assets	7.50%	7.50%
Rate of compensation increase	4.00%	4.00%
Retirement Health and Life Insurance Benefits [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	3.00%	3.25%
Expected long-term rate of return on plan assets	0.00%	0.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.25%	2.50%
Expected long-term rate of return on plan assets	0.00%	0.00%
Rate of compensation increase	0.00%	0.00%

Pension_Benefit_and_Retirement7

Pension Benefit and Retirement Health and Life Insurance Benefits (One-Percentage Point Change in Assumed Health Care Cost Trend Rates) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Percentage point change in assumed health care cost trend rates	100.00%
Effect on total service and interest cost - Increase	$60
Effect on total service and interest cost - Decrease	527
Effect on other postretirement benefit obligations - Increase	-55
Effect on other postretirement benefit obligations - Decrease	($495)

Pension_Benefit_and_Retirement8

Pension Benefit and Retirement Health and Life Insurance Benefits (Fair Value of Net Assets by Asset Category) (Details) (Pension Benefits [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]
Pension assets	$170,600	$171,218	$143,540
Pooled separate accounts [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	5,204	38,584
Fixed Income Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	102,535	0
Mutual funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	51,097	119,277
Guaranteed deposit account [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	$11,764	$13,357

Pension_Benefit_and_Retirement9

Pension Benefit and Retirement Health and Life Insurance Benefits (Assets Carried at Fair Value by Level) (Details) (Pension Benefits [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]
Pension assets	$170,600	$171,218	$143,540
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	51,097	119,277
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	107,739	38,584
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	11,764	13,357
Pooled separate accounts [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	5,204	38,584
Pooled separate accounts [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Pooled separate accounts [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	5,204	38,584
Pooled separate accounts [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Fixed Income Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	102,535	0
Fixed Income Bonds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0
Fixed Income Bonds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	102,535
Fixed Income Bonds [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0
Mutual funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	51,097	119,277
Mutual funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	51,097	119,277
Mutual funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Mutual funds [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Guaranteed deposit account [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	11,764	13,357
Guaranteed deposit account [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Guaranteed deposit account [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Guaranteed deposit account [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets	$11,764	$13,357

Recovered_Sheet4

Pension Benefit and Retirement Health and Life Insurance Benefits (Summary of Changes in Fair Value of Guaranteed Deposit Account's Level 3 Assets) (Details) (Pension Benefits [Member], Guaranteed deposit account [Member], Level 3 [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Pension Benefits [Member] | Guaranteed deposit account [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of year	$13,357
Realized gains (losses)	0
Unrealized gains relating to instruments still held at the reporting date	785
Purchases, sales, issuances and settlements (net)	-2,378
Transfers in and/or out of Level 3	0
Balance at end of year	$11,764

Recovered_Sheet5

Pension Benefit and Retirement Health and Life Insurance Benefits (Estimated Future Payments) (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2015	$8,126
2016	8,125
2017	8,355
2018	8,621
2019	8,944
2020-2024	50,043
Retirement Health and Life Insurance Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2015	1,071
2016	1,052
2017	1,017
2018	994
2019	1,038
2020-2024	$5,839

Employee_Savings_and_Investmen1

Employee Savings and Investment Plan (Additional Information) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contributions	$13,000,000	$13,000,000
Rogers Employee Savings and Investment Plan (RESIP) [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
IRS deferral limit	17,500	17,500
Employee compensation subject to employer matching percent	6.00%
Employer contributions	$2,700,000	$2,100,000	$1,700,000
Rogers Employee Savings and Investment Plan (RESIP) [Member] | 100% match [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employee compensation subject to employer matching percent	3.50%
Rogers Employee Savings and Investment Plan (RESIP) [Member] | 100% match [Member] | 1% of compensation [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer matching contribution percent	100.00%
Employee compensation subject to employer matching percent	1.00%
Rogers Employee Savings and Investment Plan (RESIP) [Member] | 50% match [Member] | 5% of compensation [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer matching contribution percent	50.00%
Employee compensation subject to employer matching percent	5.00%

Debt_Additional_Information_De

Debt (Additional Information) (Detail) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended			0 Months Ended	1 Months Ended
	Nov. 30, 2010	Mar. 31, 2011	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 13, 2011	Jul. 31, 2011	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2011	Nov. 23, 2010	Jul. 31, 2013	Jul. 31, 2012
Debt Instrument [Line Items]
Credit agreement, maximum borrowing capacity			$165,000,000									$165,000,000
Credit agreement, maturity date	23-Nov-14
Size of permitted acquisitions												25,000,000
Permitted additional indebtedness												20,000,000
Revolving credit outstanding borrowings						100,000,000
Actual leverage ratio			0.55
Actual FCCR			2.58	2.39				2.7	2.65	2.69
Capitalized debt issuance costs				100,000	700,000							1,600,000
Amortization expense, debt issue costs			500,000	500,000	500,000
Capitalized debt issuance costs, net			800,000
Amount drawn on the line of credit to fund the acquisition of Curamik		145,000,000
Repayment of debt principal			17,797,000	21,206,000	25,519,000
Term loan debt						100,000,000
Letter of credit remaining borrowing capacity			1,400,000
Fair value of interest rate swap liability			400,000
Option to buy out capital lease, year			2013
Capital lease, expiration date			2021
Capital lease obligation			6,800,000	8,000,000							12,100,000
Amortization expense related to the capital lease			400,000	400,000	400,000
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation			1,600,000	1,200,000
Interest expense on outstanding debt			1,800,000	2,200,000	2,900,000
Unused commitment fee			400,000	500,000	400,000
LIBOR in Effect at Period End			0.19%
Interest rate spread over variable rate			1.75%
Interest expense on capital lease			500,000	500,000	600,000
Interest Paid			2,500,000	3,100,000	4,000,000
Credit Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument Lower Range Basis Spread On Variable Rate						0.75%
Debt Instrument Higher Range Basis Spread On Variable Rate						1.50%
Maximum [Member] | Credit Agreement [Member]
Debt Instrument [Line Items]
Leverage ratio						3
Bank Term Loan [Member]
Debt Instrument [Line Items]
Term loan debt			60,000,000
Interest rate spread over variable rate			1.75%
Bank Term Loan [Member] | Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Interest rate swap derivative, percentage of debt hedged													65.00%	65.00%
Amended Credit Facility [Member]
Debt Instrument [Line Items]
Credit agreement, maximum borrowing capacity						265,000,000
Credit agreement, agreement period						5 years
Credit agreement, maturity date							13-Jul-16
Reduction in interest costs						0.25%
Size of permitted acquisitions						100,000,000
Permitted additional indebtedness						120,000,000
Payments commencement date							30-Sep-11
Repayment of debt principal			17,500,000	20,500,000
Debt payment obligation in 2015			35,000,000
Term loan debt			60,000,000
Amended Credit Facility [Member] | Credit Agreement [Member]
Debt Instrument [Line Items]
Repayments of Lines of Credit				8,000,000
Amended Credit Facility [Member] | Federal Funds Rate [Member]
Debt Instrument [Line Items]
Debt Instrument Lower Range Basis Spread On Variable Rate						0.50%
Amended Credit Facility [Member] | One Month LIBOR [Member]
Debt Instrument [Line Items]
Debt Instrument Higher Range Basis Spread On Variable Rate						1.00%
Amended Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Unused commitment fee percentage							0.20%
Amended Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Unused commitment fee percentage							0.35%
Amended Credit Facility [Member] | Bank Term Loan [Member]
Debt Instrument [Line Items]
Credit agreement, maximum borrowing capacity						$100,000,000
Eurocurrency loans [Member] | Credit Agreement [Member]
Debt Instrument [Line Items]
Line of credit, LIBOR rate, minimum spread						1.75%
Line of credit, LIBOR rate, maximum spread						2.50%

Debt_Aggregate_Payments_Detail

Debt (Aggregate Payments) (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Debt Disclosure [Abstract]
Repayments of principal	$17.50
Repayments of principal in 2015	35
Repayments of principal in 2016	$25

Debt_Fixed_Charge_Metrics_Deta

Debt (Fixed Charge Metrics) (Detail)	9 Months Ended	10 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Debt Disclosure [Line Items]
Covenant Limit			1.75	1.75	1.75	1.75	1.5
Actual FCCR			2.58	2.7	2.65	2.69	2.39
Amended Credit Facility [Member]
Debt Disclosure [Line Items]
Minimum fixed charge coverage ratio March 31, 2012 to December 31, 2012		1.25
Minimum fixed charge coverage ratio March 31, 2013 to December 31, 2013	1.5
Minimum fixed charge coverage ratio March 31, 2014 and thereafter	1.75

Income_Taxes_Consolidated_Inco

Income Taxes (Consolidated Income (Loss) from Continuing Operations Before Income Taxes) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Domestic	$61,446	$13,208	$6,260
International	18,964	35,677	16,390
Total	$80,410	$48,885	$22,650

Income_Taxes_Income_Tax_Expens

Income Taxes (Income Tax Expense (Benefit) in the Consolidated Statements of Income) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current
Domestic	$2,205	($7,075)	$3,651
International	17,172	12,667	8,118
Total	19,377	5,592	11,769
Deferred
Domestic	6,699	5,894	-59,414
International	1,451	-260	1,161
Total	8,150	5,634	-58,253
Domestic	8,904	-1,181	-55,763
International	18,623	12,407	9,279
Total	$27,527	$11,226	($46,484)

Income_Taxes_Deferred_Tax_Asse

Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred tax assets
Accrued employee benefits and compensation	$9,168	$9,350
Postretirement benefit obligations	7,866	2,860
Tax loss and credit carryforwards	16,533	15,041
Reserves and accruals	7,092	6,908
Depreciation and amortization	17,862	21,496
Other	2,550	3,772
Total deferred tax assets	61,071	59,427
Less deferred tax asset valuation allowance	-7,691	-7,302
Total deferred tax assets, net of valuation allowance	53,380	52,125
Deferred tax liabilities
Investment in joint ventures, net	0	0
Depreciation and amortization	14,303	15,839
Other	344	238
Total deferred tax liabilities	14,647	16,077
Net deferred tax asset	$38,733	$36,048

Income_Taxes_Additional_Inform

Income Taxes (Additional Information) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Distribution of Profits	$4,700,000
Tax loss and credit carryforwards	16,533,000	15,041,000
Tax credit carryforwards, foreign	15,500,000
Tax credit carryforwards, research	5,200,000
Tax credit carryforwards, AMT	500,000
Excluded tax credit carryforwards, foreign	8,600,000
Excluded tax credit carryforwards, research	1,200,000
Excluded tax credit carryforwards, AMT	400,000
Deferred tax asset valuation allowance	7,691,000	7,302,000
Decrease in income tax expense if valuation allowance reversed	6,800,000
Increase in equity if valuation allowance reversed	900,000
Income (loss) before income tax expense (benefit)	80,410,000	48,885,000	22,650,000
Undistributed foreign earnings	169,000,000	172,900,000
Income taxes paid, net of refunds	14,500,000	11,100,000	11,600,000
Unrecognized tax benefits	9,368,000	9,148,000	17,333,000
Unrecognized tax benefits that would impact effective tax rate	100,000
Unrecognized tax benefits, interest and penalties accrued	1,200,000	1,100,000
Minimum amount of unrecognized tax benefits that could be recognized over next 12 months	3,900,000
China [Member]
Income Taxes [Line Items]
Net operating loss carryforward, foreign	700,000
Japan [Member]
Income Taxes [Line Items]
Net operating loss carryforward, foreign	100,000
Minimum [Member]
Income Taxes [Line Items]
State operating loss carryforwards	100,000
Maximum [Member]
Income Taxes [Line Items]
State operating loss carryforwards	16,200,000
Arizona | Minimum [Member]
Income Taxes [Line Items]
Tax loss and credit carryforwards	$7,000,000

Income_Taxes_Income_Tax_Expens1

Income Taxes (Income Tax Expense Difference) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Tax expense at Federal statutory income tax rate	$28,144	$17,110	$7,928
International tax rate differential	-6,772	-2,541	-209
Foreign source income, net of tax credits	5,195	-786	-3,428
Unrecognized tax benefits	603	-2,197	1,604
General business credits	-604	-702	0
Effective Income Tax Rate Reconciliation, Acquisition Related Costs	590	0	0
Valuation allowance change	388	0	-52,650
Other	-17	342	271
Total	$27,527	$11,226	($46,484)

Income_Taxes_Reconciliation_of

Income Taxes (Reconciliation of Unrecognized Tax Benefits, Excluding Potential Interest and Penalties) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$9,148	$17,333
Gross increases - current period tax positions	1,763	1,445
Gross increases - tax positions in prior periods	335	0
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	0	-7,136
Foreign currency exchange	-230	79
Lapse of statute of limitations	-1,648	-2,573
Ending balance	$9,368	$9,148

Shareholders_Equity_and_Stock_2

Shareholders' Equity and Stock Options (Additional Information) (Details) (USD $)	1 Months Ended	12 Months Ended
	Oct. 31, 2011	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	stock_award	offering_periods
		stock_purchase_right
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower limit of exercise price range		$0.50
Vesting period		4 years
Expiration period		10 years
Time based restricted stock awards	2
Stock purchase right		1
Stock repurchase right exercise price		$240
Class of Warrant or Right, Exercise Price of Warrants or Rights		$0.01
Expected dividend yield				0.00%
Total intrinsic value of options exercised in period		$9,400,000	$13,600,000
Cash received from exercise of options exercised		20,500,000	32,400,000
Total grant-date fair value of stock options vested		300,000	400,000
Share-based Compensation expense		7,533,000	5,393,000	5,153,000
Employee stock purchase plan number of offering periods		2
Employee stock purchase plan length of offering periods		6 months
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation expense		500,000	500,000	500,000
Discount from market price percentage		15.00%
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Future compensation cost, period of recognition		1 year 0 months 5 days
Expected dividend yield		0.00%
Annual forfeiture rate		3.00%
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized		200,000
Share-based Compensation expense		300,000	400,000	2,000,000
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Future compensation cost, period of recognition		1 year 5 months 5 days
Expected dividend yield		0.00%	0.00%
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized		3,800,000
Share-based Compensation expense		2,300,000	1,300,000	500,000
Performance-based restricted stock measurement period		3 years
Performance Shares [Member] | 2012 Performance Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Target Award Percentage		118.20%	108.00%	10000000.00%
Performance Shares [Member] | 2013 Performance Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Target Award Percentage		141.00%	166.00%
Performance Shares [Member] | 2014 Performance Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Target Award Percentage		144.00%
Performance Shares [Member] | 2011 Performance Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Target Award Percentage			108.00%	100.00%
Performance Shares [Member] | 2010 Performance Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Target Award Percentage				200.00%
Performance Shares [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based restricted stock actual payout percentage		118.20%
Performance-based restricted stock award percentage target		200.00%
Performance Shares [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based restricted stock award percentage target		0.00%
Time Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Future compensation cost, period of recognition		1 year 8 months
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized		7,800,000
Share-based Compensation expense		3,600,000	2,500,000	1,600,000
Deferred Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation expense		$800,000	$700,000	$700,000

Shareholders_Equity_and_Stock_3

Shareholders' Equity and Stock Options (Shares of Capital Stock Reserved) (Details)	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance	2,508,249,000	2,293,823,000
Stock acquisition program (shares) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance	120,883,000	120,883,000
Stock options and restricted stock (shares) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance	862,040,000	1,328,414,000
Shares available for issuance (shares) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance	1,176,882,000	479,307,000
Rogers Employee and Investment Plan (shares) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance	169,044,000	169,044,000
Rogers Corporation Global Stock Ownership Plan for Employees (shares) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance	166,152,000	181,617,000
Deferred compensation to be paid in stock (shares) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance	13,248,000	14,558,000

Shareholders_Equity_and_Stock_4

Shareholders' Equity and Stock Options (Fair Value of Options Granted) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation [Abstract]
Options granted (shares)	0	0	46,950
Weighted average exercise price (in dollars per share)	$0	$0	$41.27
Weighted-average grant date fair value (in dollars per share)			$19.08
Expected volatility			47.70%
Expected term (in years)			5 years 10 months 24 days
Risk-free interest rate			1.43%
Expected dividend yield			0.00%

Shareholders_Equity_and_Stock_5

Shareholders' Equity and Stock Options (Summary of Activity Under Stock Option Plans) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Options Outstanding
Options outstanding at beginning of period (in shares)	893,139		1,765,947	2,401,809
Options granted (in shares)	0		0	46,950
Options exercised (in shares)	-476,793		-847,340	-614,263
Options canceled (in shares)	-22,999		-25,468	-68,549
Options outstanding at end of period (in shares)	393,347		893,139	1,765,947
Options exercisable at end of period (in shares)	364,770		721,645	1,274,340
Options vested at December 31, 2014 or expected to vest (in shares)	392,490	[1]
Weighted-Average Exercise Price Per Share (in dollars per share)
Weighted Average Exercise Price Per Share, Options granted (in dollars per share)	$0		$0	$41.27
Weighted Average Exercise Price Per Share, Options exercised (in dollars per share)	$44.60		$37.82	$42.97
Weighted Average Exercise Price Per Share, Options canceled (in dollars per share)	$57.07		$39.04	$43.57
Weighted Average Exercise Price Per Share, Outstanding at period end (in dollars per share)	$40.72		$43.23	$40.58	$37.54
Weighted Average Exercise Price Per Share, Options exercisable at December 31, 2014	$40.13
Weighted Average Exercise Price Per Share, Options vested at December 31, 2014 or expected to vest	$40.70	[1]
Weighted-Average Remaining Contractual Life in Years
Weighted-Average Remaining Contractual Life in Years, Options outstanding	3 years 9 months 24 days		3 years 10 months 24 days
Weighted-Average Remaining Contractual Life in Years, Options exercisable at December 31, 2014	3 years 4 months 24 days
Weighted-Average Remaining Contractual Life in Years, Options vested at December 31, 2014 or expected to vest	3 years 9 months 24 days	[1]
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Options outstanding	$16,019,130		$16,403,816
Aggregate Intrinsic Value, Options exercisable at December 31, 2014	15,069,704
Aggregate Intrinsic Value, Options vested at December 31, 2014 or expected to vest	$15,990,648	[1]
[1]	In addition to the vested options, we expect a portion of the unvested options to vest at some point in the future. Options expected to vest are calculated by applying an estimated forfeiture rate to the unvested options.

Shareholders_Equity_and_Stock_6

Shareholders' Equity and Stock Options (Monte Carlo Assumptions Used) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	47.70%
Expected term (in years)	5 years 10 months 24 days
Risk-free interest rate	1.43%
Expected dividend yield	0.00%
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility		33.70%	37.10%
Expected term (in years)		3 years	3 years
Risk-free interest rate		0.67%	0.40%
Expected dividend yield		0.00%	0.00%

Shareholders_Equity_and_Stock_7

Shareholders' Equity and Stock Options (Performance Based Restricted Stock Awards) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Performance Shares [Member]
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 (in shares)	71,175	73,458	101,730
Awards granted (in shares)	51,850	47,625	22,120
Stock issued (in shares)	-14,383	-33,538	-43,750
Awards forfeited or expired (in shares)	-16,205	-16,370	-6,642
Non-vested awards outstanding, ending balance (in shares)	92,437	71,175	73,458
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted-Average Grant Date Fair Value, Outstanding at period beginning (in dollars per share)	$47.49	$38.01	$31.19
Weighted-Average Grant Date Fair Value, Awards granted (in dollars per share)	$58.61	$47.10	$41.27
Weighted-Average Grant Date Fair Value, Stock issued (in dollars per share)	$47.89	$27.43	$23.86
Weighted-Average Grant Date Fair Value, Awards forfeited or expired (in dollars per share)	$52.71	$44.90	$37.67
Weighted-Average Grant Date Fair Value, Outstanding at period end (in dollars per share)	$52.75	$47.49	$38.01

Shareholders_Equity_and_Stock_8

Shareholders' Equity and Stock Options (Time Based Restricted Stock Awards) (Detail) (Time Based Restricted Stock [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Time Based Restricted Stock [Member]
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 (in shares)	231,026	115,139	86,707
Awards granted (in shares)	93,780	156,665	51,790
Stock issued (in shares)	-62,378	-12,436	-16,620
Awards forfeited or expired (in shares)	-24,042	-28,342	-6,738
Non-vested awards outstanding, ending balance (in shares)	238,386	231,026	115,139
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted-Average Grant Date Fair Value, Outstanding at period beginning (in dollars per share)	$48.54	$43.27	$44.55	$53.80
Weighted-Average Grant Date Fair Value, Awards granted (in dollars per share)	$61.70	$51.78	$40.99
Weighted-Average Grant Date Fair Value, Stock issued (in dollars per share)	$47.19	$43.97	$41.64
Weighted-Average Grant Date Fair Value, Awards forfeited or expired (in dollars per share)	$51.19	$47.07	$46.21

Shareholders_Equity_and_Stock_9

Shareholders' Equity and Stock Options (Deferred Stock Units) (Detail) (Deferred Stock Units [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred Stock Units [Member]
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 (in shares)	31,550	30,150	27,350
Awards granted (in shares)	14,700	16,800	17,600
Stock issued (in shares)	-16,100	-15,400	-14,800
Non-vested awards outstanding, ending balance (in shares)	30,150	31,550	30,150
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted-Average Grant Date Fair Value, Outstanding at period beginning (in dollars per share)	$26.77	$26.13	$28.80
Weighted-Average Grant Date Fair Value, Awards granted (in dollars per share)	$58.45	$41.67	$38.64
Weighted-Average Grant Date Fair Value, Stock issued (in dollars per share)	$60.08	$41.77	$45.95
Weighted-Average Grant Date Fair Value, Outstanding at period end (in dollars per share)	$24.43	$26.77	$26.13

Commitments_and_Contingencies_1

Commitments and Contingencies (Leases) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Leased Assets [Line Items]
Operating leases	$2,716,000	$2,634,000	$2,655,000
Capital lease	743,000	1,233,000	1,627,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating leases due in 2015	2,329,000
Operating leases due in 2016	1,631,000
Operating leases due in 2017	1,112,000
Operating leases due in 2018	827,000
Operating leases due in 2019	108,000
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Capital leases due in 2015	743,000
Capital leases due in 2016	743,000
Capital leases due in 2017	743,000
Capital leases due in 2018	743,000
Capital leases due in 2019	743,000
Operating leases, future minimum payments due	6,080,000
Capital leases, future minimum payments due	4,827,000
Minimum [Member]
Operating Leased Assets [Line Items]
Operating lease period	1 year
Maximum [Member]
Operating Leased Assets [Line Items]
Operating lease period	5 years
Rogers Innovation Center [Member]
Operating Leased Assets [Line Items]
Operating lease period	3 years
Lease payment amount	10,000
Rogers Innovation Center [Member] | Research Funding [Member]
Operating Leased Assets [Line Items]
Funding commitment	$500,000

Commitments_and_Contingencies_2

Commitments and Contingencies (Additional Information) (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	claims	claim
	LegalMatter	claims
		LegalMatter
Commitments and Contingencies Disclosure [Line Items]
Number of pending claims	438	362
Estimated total cleanup costs, accrual	$0.40
Percentage of claims dismissed (more than)	60.00%
Number of claims dismissed	104	115
Number of claims settled	13	23
Claims settlements amount	3.2	4.8
Cost Sharing Agreement, expiration date	25-Jan-15
Asbestos Forecast Claim Period	10 years
Asbestos-related liabilities, estimated liability	56.5
Asbestos-related liabilities, estimated insurance recovery	53
Environmental remediation expense (income)	0.8	-0.5	2.7
Minimum [Member]
Commitments and Contingencies Disclosure [Line Items]
Average number of defendants	50
Number of defendants	1
Maximum [Member]
Commitments and Contingencies Disclosure [Line Items]
Average number of defendants	300
Number of defendants	833
Claims that Specify Amount of Damages Sought not Based on Jurisdictional Requirements [Member] | Legal Claim 1 [Member]
Commitments and Contingencies Disclosure [Line Items]
Number of pending claims	1
Claims that Specify Amount of Damages Sought not Based on Jurisdictional Requirements [Member] | Legal Claim 1 [Member] | Punitive [Member]
Commitments and Contingencies Disclosure [Line Items]
Damages sought	20
Superfund Sites Proceedings [Member]
Commitments and Contingencies Disclosure [Line Items]
Number of pending claims	1
Estimated total cleanup costs, cost sharing percentage	2.00%
Loss contingency, minimum possible loss	18.8
Loss contingency, maximum possible loss	29.6
PCB Contamination Proceedings [Member]
Commitments and Contingencies Disclosure [Line Items]
PCB contamination of the building, liability recording during the period	0.2	0.7
Remediation and monitoring costs incurred since inception related to the PCB soil and building contamination	2.4
PCB Contamination Proceedings [Member] | Building [Member]
Commitments and Contingencies Disclosure [Line Items]
Remediation and monitoring costs incurred since inception related to the PCB soil and building contamination	0.5
Connecticut Voluntary Corrective Action Program (VCAP) [Member]
Commitments and Contingencies Disclosure [Line Items]
Estimated total cleanup costs, accrual	0.1
Claim of Improper Relationship Termination [Member]
Commitments and Contingencies Disclosure [Line Items]
Estimated total cleanup costs, accrual	$0.60

Business_Segment_and_Geographi2

Business Segment and Geographic Information (Narrative) (Details)	Dec. 31, 2014
	joint_venture
Segment Reporting Information [Line Items]
Number of joint ventures that are 50% owned	2
Rogers INOAC Corporation [Member]
Segment Reporting Information [Line Items]
Ownership interest in joint venture	50.00%
Rogers INOAC Suzhou Corporation [Member]
Segment Reporting Information [Line Items]
Ownership interest in joint venture	50.00%

Business_Segment_and_Geographi3

Business Segment and Geographic Information (Information About Reportable Segments) (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Net sales	$147,724	$163,052	$153,495	$146,640	$136,231	$142,820	$132,452	$125,979	$610,911	[1]	$537,482	[1]	$498,761	[1]
Operating income (loss)									80,427		49,280		25,664
Total assets	835,117				806,534				835,117		806,534
Capital expenditures									28,755		16,859		23,774
Depreciation & amortization									26,268		26,351		27,130
Investment in unconsolidated joint ventures	17,214				18,463				17,214		18,463
Equity income in unconsolidated joint ventures									4,123		4,326		4,743
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									610,911		537,482		498,761
Operating income (loss)									80,427		49,280		25,664
Total assets	835,117				806,534				835,117		806,534		759,278
Capital expenditures									28,755		16,859		23,774
Depreciation & amortization									26,268		26,351		27,130
Investment in unconsolidated joint ventures	17,214				18,463				17,214		18,463		21,171
Equity income in unconsolidated joint ventures									4,123		4,326		4,743
Operating Segments [Member] | High Performance Foams [Member]
Segment Reporting Information [Line Items]
Net sales									173,671		168,082		179,421
Operating income (loss)									23,143		22,339		25,730
Total assets	219,502				221,848				219,502		221,848		233,401
Capital expenditures									6,197		3,030		4,947
Depreciation & amortization									6,561		6,410		7,947
Investment in unconsolidated joint ventures	17,214				18,463				17,214		18,463		21,171
Equity income in unconsolidated joint ventures									4,123		4,326		4,743
Operating Segments [Member] | Advanced Connectivity Solutions [Member]
Segment Reporting Information [Line Items]
Net sales									240,864		184,949		161,893
Operating income (loss)									43,703		18,788		8,170
Total assets	215,077				177,716				215,077		177,716		156,103
Capital expenditures									14,290		7,793		12,849
Depreciation & amortization									9,575		7,004		7,172
Operating Segments [Member] | Power Electronics Solutions [Member]
Segment Reporting Information [Line Items]
Net sales									171,832		160,730		134,279
Operating income (loss)									5,355		1,088		-12,022
Total assets	375,686				382,818				375,686		382,818		345,013
Capital expenditures									7,489		5,287		5,746
Depreciation & amortization									9,332		12,406		11,083
Investment in unconsolidated joint ventures	0				0				0		0		0
Equity income in unconsolidated joint ventures									0		0		0
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Net sales									24,544		23,721		23,168
Operating income (loss)									8,226		7,065		3,786
Total assets	24,852				24,152				24,852		24,152		24,761
Capital expenditures									779		749		232
Depreciation & amortization									$800		$531		$928
[1]	Net sales are allocated to countries based on the location of the customer.

Business_Segment_and_Geographi4

Business Segment and Geographic Information (Reconciliation to Consolidated Statements of Income (Loss)) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting [Abstract]
Operating Income (Loss)	$80,427	$49,280	$25,664
Equity income in unconsolidated joint ventures	4,123	4,326	4,743
Other income (expense), net	-1,194	-1,240	-208
Net realized investment gain (loss)	0	0	-3,245
Interest income (expense), net	-2,946	-3,481	-4,304
Income (loss) before income taxes	$80,410	$48,885	$22,650

Business_Segment_and_Geographi5

Business Segment and Geographic Information (Operations by Geographic Area) (Details) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2014

Sep. 30, 2014

Jun. 30, 2014

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Segment Reporting Information [Line Items]

Net sales

$147,724

$163,052

$153,495

$146,640

$136,231

$142,820

$132,452

$125,979

$610,911

[1]

$537,482

[1]

$498,761

[1]

Long-Lived Assets

286,987

[2]

304,773

[2]

286,987

[2]

304,773

[2]

307,346

[2]

United States [Member]

Segment Reporting Information [Line Items]

Net sales

128,186

[1]

118,263

[1]

115,035

[1]

Long-Lived Assets

70,532

[2]

64,545

[2]

70,532

[2]

64,545

[2]

64,845

[2]

Asia [Member]

Segment Reporting Information [Line Items]

Net sales

324,643

[1]

275,969

[1]

250,682

[1]

Long-Lived Assets

71,661

[2]

68,613

[2]

71,661

[2]

68,613

[2]

69,830

[2]

Europe [Member]

Segment Reporting Information [Line Items]

Net sales

148,026

[1]

132,126

[1]

123,040

[1]

Long-Lived Assets

144,794

[2]

171,615

[2]

144,794

[2]

171,615

[2]

172,671

[2]

Other regions [Member]

Segment Reporting Information [Line Items]

Net sales

10,056

[1]

11,124

[1]

10,004

[1]

Long-Lived Assets

$0

[2]

$0

[2]

$0

[2]

$0

[2]

$0

[2]

[1]

Net sales are allocated to countries based on the location of the customer.

[2]

Long-lived assets are based on the location of the asset and are comprised of goodwill and other intangibles and property, plant and equipment.

Restructuring_and_Impairment_C2

Restructuring and Impairment Charges (Additional Information) (Detail) (USD $)	3 Months Ended	12 Months Ended						3 Months Ended		12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		Mar. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Defined benefit pension plan settlement charge	$5,200,000
Restructuring and impairment charges		5,390,000		10,376,000		14,082,000
Restructuring charges						15,900,000
Restructuring charges recorded in cost of sales		0		368,000		1,847,000
Proceeds from the sale of property, plant and equipment, net		69,000		7,000		2,804,000
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Proceeds from the sale of property, plant and equipment, net								1,500,000
Facility book value								1,800,000
Building selling costs						100,000
High Performance Foams [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0		1,345,000		2,188,000
High Performance Foams [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0		0		1,442,000
Accelerated depreciation		0		0		764,000
Fixed asset disposal charges		0	[1]	0	[1]	79,000	[1]		100,000	400,000
Power Distribution Systems [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges						1,400,000
Power Distribution Systems [Member] | Asset Impairments [Member]
Restructuring Cost and Reserve [Line Items]
Impairment of investments		0		0		264,000
Power Distribution Systems [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0		0		149,000
Advanced Connectivity Solutions [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0		802,000		2,915,000
Advanced Connectivity Solutions [Member] | Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges						2,900,000
Other [Member] | Asset Impairments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0		0		356,000
Streamlining and restructuring related activites [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment charges				5,700,000
Streamlining and restructuring related activites [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment charges				4,200,000
Restructuring charges						7,100,000
Streamlining and restructuring related activites [Member] | Defined Benefit Plan, Curtailment Charge [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment charges				1,500,000
Streamlining and restructuring related activites [Member] | Early Retirement Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges						1,600,000
Streamlining and restructuring related activites [Member] | Special Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges						5,500,000
Streamlining and restructuring related activites [Member] | High Performance Foams [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges						2,200,000
Streamlining and restructuring related activites [Member] | Other [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges						300,000
Curamik finishing operations relocated to Hungary [Member] | Curamik Electronics Solutions [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges						3,800,000
Curamik finishing operations relocated to Hungary [Member] | Curamik Electronics Solutions [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Accelerated depreciation						400,000
Bremen facility shut-down [Member] | High Performance Foams [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									900,000
Bremen facility shut-down [Member] | High Performance Foams [Member] | Asset Impairments [Member]
Restructuring Cost and Reserve [Line Items]
Accelerated depreciation									800,000
Bremen facility shut-down [Member] | High Performance Foams [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges						3,300,000			1,400,000
Restricted cash						1,000,000
Bremen facility shut-down [Member] | High Performance Foams [Member] | Inventory Valuation Reserve [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									200,000
Shutdown of Power Distribution Systems [Member] | Power Distribution Systems [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Accelerated depreciation						500,000
Shutdown of Power Distribution Systems [Member] | Power Distribution Systems [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges						100,000
Solicore, Inc. [Member] | Asset Impairments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment charges		$200,000		$4,600,000
[1]	In the first quarter of 2012, we signed an agreement to sell our facility in Richmond, Virginia for $1.5 million. This facility had a book value of approximately $1.8 million prior to the signing of the agreement, and we recorded an impairment charge of approximately $0.4 million as of December 31, 2011, which represented the write down to the selling price minus approximately $0.1 million of estimated selling costs. The transaction closed in the second quarter of 2012.

Restructuring_and_Impairment_C3

Restructuring and Impairment Charges (Restructuring and Impairment Charges) (Detail) (USD $)	3 Months Ended	12 Months Ended						3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		Jun. 30, 2012	Dec. 31, 2011
Cost of Sales
Restructuring charges recorded in cost of sales		$0		$368		$1,847
Defined benefit pension plan settlement charge	5,200
Restructuring and Impairment
Restructuring charges						15,900
Total charges for Restructuring and Impairment		5,390		10,376		14,082
Power Electronics Solutions [Member] | Facility Closing [Member]
Cost of Sales
Accelerated depreciation		0		0		393
Other [Member] | Employee Severance [Member]
Restructuring and Impairment
Restructuring charges		0		115		255
Power Distribution Systems [Member] | Power Electronics Solutions [Member] | Facility Closing [Member]
Cost of Sales
Accelerated depreciation		0		0		499
Curamik Electronics Solutions [Member] | Power Electronics Solutions [Member] | Employee Severance [Member]
Restructuring and Impairment
Restructuring charges		0		3,494		1,799
High Performance Foams [Member] | Facility Closing [Member]
Cost of Sales
Accelerated depreciation		0		0		764
Restructuring and Impairment
Fixed asset disposal charges		0	[1]	0	[1]	79	[1]	100	400
Severance Costs		0		0		861
Restructuring charges		0		0		1,442
High Performance Foams [Member] | Asset Impairments [Member]
Cost of Sales
Inventory write-down		0		0		191
Restructuring and Impairment
Allocated Solicore impairment		42		1,617		0
High Performance Foams [Member] | Employee Severance [Member]
Cost of Sales
Union ratification bonus		0		181		0
Restructuring and Impairment
Restructuring charges		0		1,345		2,188
High Performance Foams [Member] | Pension Settlement [Member]
Cost of Sales
Defined benefit pension plan settlement charge		1,332		0		0
Advanced Connectivity Solutions [Member] | Asset Impairments [Member]
Restructuring and Impairment
Allocated Solicore impairment		62		1,617		0
Advanced Connectivity Solutions [Member] | Employee Severance [Member]
Cost of Sales
Union ratification bonus		0		179		0
Restructuring and Impairment
Restructuring charges		0		802		2,915
Advanced Connectivity Solutions [Member] | Pension Settlement [Member]
Cost of Sales
Defined benefit pension plan settlement charge		1,954		0		0
Power Distribution Systems [Member] | Facility Closing [Member]
Restructuring and Impairment
Restructuring charges		0		0		149
Power Distribution Systems [Member] | Asset Impairments [Member]
Restructuring and Impairment
Allocated Solicore impairment		61		1,155		0
Impairment of investments		0		0		264
Power Distribution Systems [Member] | Employee Severance [Member]
Restructuring and Impairment
Restructuring charges						1,400
Power Distribution Systems [Member] | Pension Settlement [Member]
Cost of Sales
Defined benefit pension plan settlement charge		1,921		0		0
Power Distribution Systems [Member] | Power Electronics Solutions [Member] | Employee Severance [Member]
Cost of Sales
Union ratification bonus		0		8		0
Curamik Electronics Solutions [Member] | Employee Severance [Member]
Restructuring and Impairment
Severance Costs		0		0		3,774
Other [Member] | Asset Impairments [Member]
Restructuring and Impairment
Restructuring charges		0		0		356
Allocated Solicore impairment		1		231		0
Other [Member] | Pension Settlement [Member]
Cost of Sales
Defined benefit pension plan settlement charge		$17		$0		$0
[1]	In the first quarter of 2012, we signed an agreement to sell our facility in Richmond, Virginia for $1.5 million. This facility had a book value of approximately $1.8 million prior to the signing of the agreement, and we recorded an impairment charge of approximately $0.4 million as of December 31, 2011, which represented the write down to the selling price minus approximately $0.1 million of estimated selling costs. The transaction closed in the second quarter of 2012.

Restructuring_and_Impairment_C4

Restructuring and Impairment Charges (Summary of Severance Accrual Activity) (Detail) (Employee Severance [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Restructuring Reserve [Roll Forward]
Balance at January 1, 2014	$695
Provisions	0
Payments	-695
Balance at December 31, 2014	0
Streamlining and restructuring related activites [Member]
Restructuring Reserve [Roll Forward]
Balance at January 1, 2014	695
Provisions
Payments	-695
Balance at December 31, 2014	0
Bremen facility shut-down [Member]
Restructuring Reserve [Roll Forward]
Balance at January 1, 2014	0
Provisions	0
Payments	0
Balance at December 31, 2014	0
Curamik finishing operations relocated to Hungary [Member]
Restructuring Reserve [Roll Forward]
Balance at January 1, 2014	0
Provisions	0
Payments	0
Balance at December 31, 2014	$0

Discontinued_Operations_Additi

Discontinued Operations (Additional Information) (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Thernal Management Solutions [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of income taxes		($0.10)
Net sales associated with the discontinued operations		0.1
Composite Material Division [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of income taxes	0.1	-0.3
Net sales associated with the discontinued operations	0.2	5.3
Tax related to discontinued operations	$0.10

Quarterly_Results_of_Operation2

Quarterly Results of Operations (UNAUDITED) (Results of Operations) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Net sales	$147,724	$163,052	$153,495	$146,640	$136,231	$142,820	$132,452	$125,979	$610,911	[1]	$537,482	[1]	$498,761	[1]
Gross margin	58,335	64,548	57,138	53,919	50,796	51,186	44,429	41,289	233,939		187,700		158,746
Income (loss) from continuing operations	$7,013	$20,388	$10,902	$14,580	$11,528	$13,572	$5,583	$6,976	$52,883		$37,659		$69,134
Net income per basic share (in dollars per share)	$0.38	$1.12	$0.60	$0.81	$0.66	$0.79	$0.33	$0.41	$2.91		$2.19		$4.21
Net income per diluted share (in dollars per share)	$0.37	$1.09	$0.58	$0.79	$0.64	$0.76	$0.32	$0.39	$2.83		$2.12		$4.07
[1]	Net sales are allocated to countries based on the location of the customer.

Subsequent_Events_Subsequent_E

Subsequent Events Subsequent Events (Details) (USD $)	3 Months Ended	12 Months Ended	0 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2011	Dec. 31, 2014	Jan. 22, 2015	Jan. 15, 2015
Subsequent Event [Line Items]
Cash from credit facility used to fund acquisition	$145
Interest rate spread over variable rate		1.75%
Arlon LLC [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Purchase price			157
Line of credit facility interest rate				1.94%
Arlon LLC [Member] | Subsequent Event [Member] | LIBO rate [Member] | Minimum [Member]
Subsequent Event [Line Items]
Interest rate spread over variable rate				1.75%
Arlon LLC [Member] | Subsequent Event [Member] | LIBO rate [Member] | Maximum [Member]
Subsequent Event [Line Items]
Interest rate spread over variable rate				2.00%
Arlon LLC [Member] | Subsequent Event [Member] | Credit Facility [Member]
Subsequent Event [Line Items]
Cash from credit facility used to fund acquisition				125

SCHEDULE_II_Valuation_and_Qual1

SCHEDULE II Valuation and Qualifying Accounts (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$1,655	$1,773	$1,040
Charged to (Reduction of) Costs and Expenses	250	670	1,253
Taken Against Allowance	-1,429	-788	-520
Other (Deductions) Recoveries	0	0	0
Balance at End of Period	$476	$1,655	$1,773