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

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Fair value of financial and nonfinancial obligations.

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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, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets:
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities	$ 0	$ 0
Held-to-maturity Securities, Unrecognized Holding Gain	0	0
Held-to-maturity Securities, Transferred Security, at Carrying Value	0	0
Liabilities:
Long-term Debt	515,931	509,407
Fair Value, Measurements, Recurring [Member]
Assets:
Assets held in rabbi trusts	52,148	41,770
Available for sale securities	4,405	4,309
Fair Value Assets	130,182	116,899
Liabilities:
Fair Value Liabilities		(70)
Defined Benefit Pension Plans [Member] \| Foreign Plan [Member]
Assets:
Fair value of plan assets	73,629	70,820	$ 70,605
Defined Benefit Pension Plans [Member] \| Foreign Plan [Member] \| Equity Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Fair value of plan assets	10,534	9,344
Defined Benefit Pension Plans [Member] \| Foreign Plan [Member] \| Fixed Income Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Fair value of plan assets	16,381	13,572
Defined Benefit Pension Plans [Member] \| Foreign Plan [Member] \| Cash and Cash Equivalents [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Fair value of plan assets	46,714	47,904
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Assets held in rabbi trusts	34,280	26,278
Available for sale securities	4,405	4,309
Fair Value Assets	112,314	101,407
Liabilities:
Fair Value Liabilities		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	10,534	9,344
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	16,381	13,572
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	46,714	47,904
Fair Value, Inputs, Level 2 [Member]
Liabilities:
Long-term Debt, Fair Value	632,200	577,200
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Assets held in rabbi trusts	17,868	15,492
Available for sale securities	0	0
Fair Value Assets	17,868	15,492
Liabilities:
Fair Value Liabilities		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)
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:
Convertible debentures issuance date	Nov. 09, 2010
Convertible Senior Debentures, Due 2040 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative		(1)
Convertible Senior Debentures, Due 2040 [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative		0
Convertible Senior Debentures, Due 2040 [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative		0
Convertible Senior Debentures, Due 2040 [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative		(1)
Convertible Senior Debentures, Due 2041 [Member]
Liabilities:
Convertible debentures issuance date	May 13, 2011
Convertible Senior Debentures, Due 2041 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative		(67)
Convertible Senior Debentures, Due 2041 [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative		0
Convertible Senior Debentures, Due 2041 [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative		0
Convertible Senior Debentures, Due 2041 [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative		(67)
Convertible Senior Debentures 2042 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative		(2)
Convertible Senior Debentures 2042 [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative		0
Convertible Senior Debentures 2042 [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative		0
Convertible Senior Debentures 2042 [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative		$ (2)