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Derivatives - Narrative (Details) | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2017 USD ($) | Jul. 01, 2017 USD ($) | Oct. 01, 2016 USD ($) | Sep. 30, 2017 USD ($) | Oct. 01, 2016 USD ($) | Jan. 16, 2015 USD ($)
Forward Currency-Exchange Contracts [Abstract] |  |  |  |  |  |
Recognized gains (losses) | $ 109,000 |  | $ (120,000) | $ (1,384,000) | $ (556,000) |
NII FPG [Member] |  |  |  |  |  |
Forward Currency-Exchange Contracts [Abstract] |  |  |  |  |  |
Recognized gains (losses) |  | $ (1,754,000) |  |  |  |
Interest Rate Swap Agreement [Member] |  |  |  |  |  |
Interest Rate Swaps [Abstract] |  |  |  |  |  |
Rate of effectiveness of interest rate swap agreement (in hundredths) |  |  |  | 100.00% |  |
Maximum consolidated leverage ratio |  |  |  | 3.5 |  |
Minimum consolidated interest coverage ratio |  |  |  | 3 |  |
Unrealized gain on derivatives |  |  |  | $ 65,000 |  |
Foreign Exchange Forward [Member] |  |  |  |  |  |
Forward Currency-Exchange Contracts [Abstract] |  |  |  |  |  |
Maximum period over which entity manages its level of exposure of risk |  |  |  | 12 months |  |
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Swap Agreement 2015 [Member] |  |  |  |  |  |
Interest Rate Swaps [Abstract] |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | $ 10,000,000
Fixed rate of interest (in hundredths) |  |  |  |  |  | 1.50%

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The maximum consolidated leverage ratio under the negative covenants of the credit facility. + References No definition available. + Details
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- Definition The minimum consolidated interest charge coverage ratio (calculated as income before interest and taxes, divided by interest) to be in compliance with the financial covenant under an existing debt agreement. + References No definition available. + Details
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- Definition The period over which the entity typically manages its level of exposure to the risk of currency-exchange fluctuations by hedging a portion of its currency exposures anticipated over the ensuing period. + References No definition available. + Details
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- Definition The percentage of effectiveness of derivative instruments. + References No definition available. + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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