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

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

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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.

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

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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Amount, before tax, of other-than-temporary impairment (OTTI) on investment in debt security measured at amortized cost (held-to-maturity), recognized in earnings and other comprehensive income (OCI).

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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 Measurements (Details) - USD ($) $ in Thousands	12 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2018	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:
Long-term Debt	509,407	$ 379,033
Derivative, Notional Amount	0	100,000
Fair Value, Measurements, Recurring [Member]
Assets:
Assets held in rabbi trusts	41,770	45,252
Available for sale securities	4,309	4,621
Fair Value Assets	116,899	120,478
Liabilities:
Fair Value Liabilities	(70)	(538)
Defined Benefit Pension Plans [Member] \| Foreign Plan [Member]
Assets:
Fair value of plan assets	70,820	70,605	$ 66,090
Defined Benefit Pension Plans [Member] \| Foreign Plan [Member] \| Equity Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Fair value of plan assets	9,344	8,793
Defined Benefit Pension Plans [Member] \| Foreign Plan [Member] \| Fixed Income Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Fair value of plan assets	13,572	12,793
Defined Benefit Pension Plans [Member] \| Foreign Plan [Member] \| Cash and Cash Equivalents [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Fair value of plan assets	47,904	49,019
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Assets held in rabbi trusts	26,278	28,589
Available for sale securities	4,309	4,621
Fair Value Assets	101,407	103,815
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	9,344	8,793
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	13,572	12,793
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	47,904	49,019
Fair Value, Inputs, Level 2 [Member]
Liabilities:
Long-term Debt, Fair Value	577,200	1,071,200
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Assets held in rabbi trusts	15,492	16,663
Available for sale securities	0	0
Fair Value Assets	15,492	16,663
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	(70)	(538)
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	$ (1)	(206)
Convertible debentures issuance date	Nov. 09, 2010
Convertible Senior Debentures, Due 2040 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative	$ (1)	(206)
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]
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Embedded derivative	(1)	(206)
Convertible Senior Debentures, Due 2041 [Member]
Liabilities:
Embedded derivative	$ (67)	(214)
Convertible debentures issuance date	May 13, 2011
Convertible Senior Debentures, Due 2041 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative	$ (67)	(214)
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	$ (67)	(214)
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	$ (2)	(118)
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	$ (2)	$ (118)