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Debt - Private Placement Borrowings (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 20, 2016 | Dec. 30, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |
Total Long-term debt |  |  | $ 924,415 | $ 781,380
Private placement facilities [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total Long-term debt |  |  | 535,295 | $ 342,857
Less: Deferred debt issuance costs |  |  | $ (419) |
Debt Instrument, Maturity Date |  |  | Sep. 15, 2020 |
Private placement facilities [Member] | Private placement facilities maturing in September 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Issuance Date |  |  | Sep. 02, 2010 |
Total Long-term debt |  |  | $ 100,000 |
Borrowing Rate |  |  | 3.79% |
Debt Instrument, Maturity Date |  |  | Sep. 02, 2020 |
Private placement facilities [Member] | Private placement facilities maturing in January 2024 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Issuance Date |  |  | Jan. 20, 2012 |
Total Long-term debt |  |  | $ 50,000 |
Borrowing Rate |  |  | 3.45% |
Debt Instrument, Maturity Date |  |  | Jan. 20, 2024 |
Private placement facilities [Member] | Private placement facilities maturing in January 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Issuance Date | [1] |  | Jan. 20, 2012 |
Total Long-term debt | [1] |  | $ 35,714 |
Borrowing Rate | [1] |  | 3.09% |
Debt Instrument, Maturity Date | [1] |  | Jan. 20, 2022 |
Private placement facility, repayment frequency |  |  | Annual |
Private placement facility, annual payment |  | $ 7,100 |  |
Debt Instrument, Date of First Required Payment |  |  | Jan. 20, 2016 |
Private placement facilities [Member] | Private placement facilities maturing in December 2024 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Issuance Date |  |  | Dec. 24, 2012 |
Total Long-term debt |  |  | $ 50,000 |
Borrowing Rate |  |  | 3.00% |
Debt Instrument, Maturity Date |  |  | Dec. 24, 2024 |
Private placement facilities [Member] | Private placement facilities maturing in June 2021 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Issuance Date |  |  | Jun. 02, 2014 |
Total Long-term debt |  |  | $ 100,000 |
Borrowing Rate |  |  | 3.19% |
Debt Instrument, Maturity Date |  |  | Jun. 02, 2021 |
Private placement facilities [Member] | Private Placement facilities maturing in June 2027 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Issuance Date |  |  | Jun. 16, 2017 |
Total Long-term debt |  |  | $ 100,000 |
Borrowing Rate |  |  | 3.42% |
Debt Instrument, Maturity Date |  |  | Jun. 16, 2027 |
Private placement facilities [Member] | Private Placement Facilities maturing in September 2029 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Issuance Date |  |  | Sep. 15, 2017 |
Total Long-term debt |  |  | $ 100,000 |
Borrowing Rate |  |  | 3.52% |
Debt Instrument, Maturity Date |  |  | Sep. 15, 2029 |
[1] | (1) Annual repayments of approximately $7.1 million for this borrowing commenced on January 20, 2016.

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