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Debt - Private Placement Borrowings (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jul. 01, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |
Total long-term debt |  | $ 824,866 | $ 781,380
Private Placement Facilities [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Issuance Date |  | Sep. 22, 2014 |
Total long-term debt |  | $ 435,714 | $ 342,857
Debt Instrument, Maturity Date |  | Sep. 22, 2017 |
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, frequency of periodic payment |  | 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 |
[1] | Annual repayments of approximately $7.1 million for this borrowing commenced on January 20, 2016.

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