Debt Obligations - Debt & Capital Leases (Details) - USD ($) $ in Thousands	Dec. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Principal amount	$ 250,000
Less unamortized discount based on imputed interest rate of 13.0%	3,202
Capital lease obligations	6,832	$ 6,805
Total debt and capital lease obligations	253,630	250,209
Less current portion	253,630	0
Total long-term debt and capital lease obligations	0	250,209
Option To Repurchase Headquarters Building 2019 [Member]
Debt Instrument [Line Items]
Principal amount	250,000	250,000
Less unamortized discount based on imputed interest rate of 13.0%	3,202	6,596
Net option to repurchase ownership interest in headquarters building in 2019	$ 246,798	$ 243,404

Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

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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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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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