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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.

X

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Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Topic 210
-SubTopic 10
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