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Fair Value Measurements (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Oct. 01, 2016 | Dec. 31, 2015
Assets: |  |  |  |
Held-to-maturity Securities, Transferred Security, at Carrying Value | $ 0 |  |  |
Held-to-maturity Securities, Unrecognized Holding Gain | 0 |  |  |
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities | 0 |  |  |
Liabilities: |  |  |  |
Embedded derivative | (538) | $ (854) |  |
Long-term Debt | 379,033 | 367,049 |  |
Derivative, Notional Amount | 100,000 | 100,000 |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Assets held in rabbi trusts | 45,252 | 41,917 |  |
Available for sale securities | 4,621 | 3,969 |  |
Fair Value Assets | 120,478 | 111,976 |  |
Liabilities: |  |  |  |
Fair Value Liabilities | (538) | (854) |  |
Defined Benefit Pension Plans [Member] | Foreign Plan [Member] |  |  |  |
Assets: |  |  |  |
Fair value of plan assets | 70,605 | 66,090 |  | $ 51,263
Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Fair value of plan assets | 8,793 | 9,963 |  |
Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Fair value of plan assets | 12,793 | 12,780 |  |
Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Fair value of plan assets | 49,019 | 43,347 |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Assets held in rabbi trusts | 28,589 | 27,297 |  |
Available for sale securities | 4,621 | 3,969 |  |
Fair Value Assets | 103,815 | 97,356 |  |
Liabilities: |  |  |  |
Fair Value Liabilities | 0 | 0 |  |
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Fair value of plan assets | 8,793 | 9,963 |  |
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Fair value of plan assets | 12,793 | 12,780 |  |
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Fair value of plan assets | 49,019 | 43,347 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Liabilities: |  |  |  |
Long-term Debt, Fair Value | 1,071,200 | 860,600 |  |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Assets held in rabbi trusts | 16,663 | 14,620 |  |
Available for sale securities | 0 | 0 |  |
Fair Value Assets | 16,663 | 14,620 |  |
Liabilities: |  |  |  |
Fair Value Liabilities | 0 | 0 |  |
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Fair value of plan assets | 0 | 0 |  |
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Fair value of plan assets | 0 | 0 |  |
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Fair value of plan assets | 0 | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Assets held in rabbi trusts | 0 | 0 |  |
Available for sale securities | 0 | 0 |  |
Fair Value Assets | 0 | 0 |  |
Liabilities: |  |  |  |
Fair Value Liabilities | (538) | (854) |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets: |  |  |  |
Fair value of definite-lived intangible asset |  |  | $ 18,800 | $ 20,359
Fair Value, Inputs, Level 3 [Member] | Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Fair value of plan assets | 0 | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Fair value of plan assets | 0 | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Fair value of plan assets | 0 | 0 |  |
Convertible Senior Debentures, Due 2040 [Member] |  |  |  |
Liabilities: |  |  |  |
Embedded derivative | $ (206) | (393) |  |
Convertible debentures issuance date | Nov. 09, 2010 |  |  |
Convertible Senior Debentures, Due 2040 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Liabilities: |  |  |  |
Embedded derivative | $ (206) | (393) |  |
Convertible Senior Debentures, Due 2040 [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Liabilities: |  |  |  |
Embedded derivative | 0 | 0 |  |
Convertible Senior Debentures, Due 2040 [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Liabilities: |  |  |  |
Embedded derivative | 0 | 0 |  |
Convertible Senior Debentures, Due 2040 [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Liabilities: |  |  |  |
Embedded derivative | (206) | (393) |  |
Convertible Senior Debentures, Due 2041 [Member] |  |  |  |
Liabilities: |  |  |  |
Embedded derivative | $ (214) | (285) |  |
Convertible debentures issuance date | May 13, 2011 |  |  |
Convertible Senior Debentures, Due 2041 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Liabilities: |  |  |  |
Embedded derivative | $ (214) | (285) |  |
Convertible Senior Debentures, Due 2041 [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Liabilities: |  |  |  |
Embedded derivative | 0 | 0 |  |
Convertible Senior Debentures, Due 2041 [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Liabilities: |  |  |  |
Embedded derivative | 0 | 0 |  |
Convertible Senior Debentures, Due 2041 [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Liabilities: |  |  |  |
Embedded derivative | $ (214) | (285) |  |
Convertible Senior Debentures 2042 [Member] |  |  |  |
Liabilities: |  |  |  |
Convertible debentures issuance date | May 31, 2012 |  |  |
Convertible Senior Debentures 2042 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Liabilities: |  |  |  |
Embedded derivative | $ (118) | (176) |  |
Convertible Senior Debentures 2042 [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Liabilities: |  |  |  |
Embedded derivative | 0 | 0 |  |
Convertible Senior Debentures 2042 [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Liabilities: |  |  |  |
Embedded derivative | 0 | 0 |  |
Convertible Senior Debentures 2042 [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Liabilities: |  |  |  |
Embedded derivative | $ (118) | $ (176) |  |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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- Definition For any transfer of securities categorized as held-to-maturity, this item represents the net carrying amount of the transferred security to another category of investments in debt and equity securities (trading or available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums and derivative liability, if any. + References No definition available. + Details
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