XML 111 R98.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Pension, Other Postretirement Benefits and Employee Savings and Investment Plans (Assets Carried at Fair Value by Level) (Details) - Pension Benefits - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | $ 191,652 | $ 180,056 | $ 171,778
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 2,691 | 6,223 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 187,601 | 167,544 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 1,360 | 6,289 |
Pooled separate accounts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 1,216 | 4,610 |
Pooled separate accounts | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Pooled separate accounts | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 1,216 | 4,610 |
Pooled separate accounts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Fixed income bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 186,385 | 162,934 |
Fixed income bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Fixed income bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 186,385 | 162,934 |
Fixed income bonds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 2,691 | 6,223 |
Mutual funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 2,691 | 6,223 |
Mutual funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Mutual funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Guaranteed deposit account |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 1,360 | 6,289 |
Guaranteed deposit account | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Guaranteed deposit account | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Guaranteed deposit account | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | $ 1,360 | $ 6,289 |

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=rog_PooledSeparateAccountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=rog_FixedIncomeBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=rog_MutualFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=rog_GuaranteedDepositAccountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |