Debt Obligations - Debt & Capital Leases (Details) - USD ($) $ in Thousands	Jul. 01, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Net option to repurchase ownership interest in headquarters building in 2019	$ 245,093	$ 243,404
Capital lease obligations	6,818	6,805
Total long-term debt and capital lease obligations	$ 251,911	250,209
Option To Repurchase Headquarters Building 2019
Debt Instrument [Line Items]
Imputed interest rate, as a percentage	13.00%
Principal amount	$ 250,000	250,000
Less unamortized discount based on imputed interest rate of 13.0%	$ 4,907	$ 6,596

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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-Name Accounting Standards Codification
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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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