Fair Value Measurements (Details) - USD ($) $ in Thousands	9 Months Ended
Oct. 03, 2015	Dec. 31, 2014
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	(1,782)	$ (1,105)
Long-term Debt, Fair Value	665,000	853,500
Carrying value of long-term debt, excluding derivative liabilities	429,984	453,817
Derivative, Notional Amount	$ 29,000
Derivative, Description of Terms	The Company enters into forward contracts with a highly-rated financial institution to mitigate the foreign currency risk associated with intercompany loans denominated in a currency other than the legal entity's functional currency. The notional amount of the forward contracts were $29,000 as of October 3, 2015. The forward contracts settle monthly and are expected to be renewed at the Company's discretion on a monthly basis until the intercompany loans are repaid. The forward contracts were renewed on the last day of the third fiscal quarter. We have not designated the forward contracts as hedges for accounting purposes, and as such the change in the fair value of the contracts are recognized in the consolidated condensed statements of operations as a component of other income (expense).
Capella [Member]
Assets:
Long-lived assets held and used, carrying value	$ 68,500
Fair Value, Measurements, Recurring [Member]
Assets:
Assets held in rabbi trusts	38,623	40,270
Available for sale securities	3,971	15,432
Fair Value Assets	42,594	55,702
Liabilities:
Fair Value Liabilities	(1,782)	(1,105)
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Assets held in rabbi trusts	25,064	26,853
Available for sale securities	3,971	4,439
Fair Value Assets	29,035	31,292
Liabilities:
Fair Value Liabilities	0	0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Assets held in rabbi trusts	13,559	13,417
Available for sale securities	0	10,993
Fair Value Assets	13,559	24,410
Liabilities:
Fair Value Liabilities	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	(1,782)	(1,105)
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Capella [Member]
Assets:
Long-lived assets held and used, Fair value disclosure	10,900
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Capacitors Segment [Member]
Assets:
Goodwill, Fair Value Disclosure	0
Convertible Senior Debentures, Due 2040 [Member]
Liabilities:
Embedded derivative	(830)	(526)
Convertible Senior Debentures, Due 2040 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative	(830)	(526)
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	(830)	(526)
Convertible Senior Debentures, Due 2041 [Member]
Liabilities:
Embedded derivative	(570)	(341)
Convertible Senior Debentures, Due 2041 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative	(570)	(341)
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	(570)	(341)
Convertible Senior Debentures, Due 2042 [Member]
Liabilities:
Embedded derivative	(382)	(238)
Convertible Senior Debentures, Due 2042 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative	(382)	(238)
Convertible Senior Debentures, Due 2042 [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative	0	0
Convertible Senior Debentures, Due 2042 [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative	0	0
Convertible Senior Debentures, Due 2042 [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Embedded derivative	$ (382)	$ (238)

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

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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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Description of the relevant terms of the derivative. Includes the type of instrument, risk being hedged, notional amount, counterparty, inception date, maturity date, relevant interest rates, strike price, cap price, and floor price.

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Fair value portion of asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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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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Carrying value of long-lived assets prior to impairment.

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Fair value of long-lived assets held and used as determined on a non-recurring basis.

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The carrying value of long-term debt, excluding the derivative liability.

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