Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Date the debt instrument was issued, in CCYY-MM-DD format.

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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.

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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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No definition available.

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Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life.

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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).

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Amount of unrecognized gain before loss on investments in held-to-maturity securities.

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Fair value of financial and nonfinancial obligations.

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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.

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The amount by which the fair value of an investment in debt securities categorized as Held-to-maturity is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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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.

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Fair value as of the balance sheet date of assets held in rabbi trusts to fund payments under deferred compensation and non-qualified pension plans.

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Fair Value Measurements (Details) - USD ($) $ in Thousands	12 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Thousands	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)