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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Apr. 01, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Asset measured at, fair value | $ 3,347 |
Recurring [Member] |  |
Assets |  |
Assets measured at fair value, Adjusted cost | 5,121 | $ 7,446
Assets measured at fair value, Unrealized gains | 35 | 40
Assets measured at fair value, Unrealized losses | (452) | (661)
Asset measured at, fair value | 4,704 | 6,825
Recurring [Member] | Level 1 [Member] |  |
Assets |  |
Assets measured at fair value, Adjusted cost | 1,483 | 1,483
Assets measured at fair value, Unrealized gains | 22 | 31
Assets measured at fair value, Unrealized losses | (148) | (159)
Asset measured at, fair value | 1,357 | 1,355
Recurring [Member] | Level 1 [Member] | Equity securities [Member] |  |
Assets |  |
Assets measured at fair value, Adjusted cost | 0 | 0
Assets measured at fair value, Unrealized gains | 22 | 31
Assets measured at fair value, Unrealized losses | 0 | 0
Asset measured at, fair value | 22 | 31
Recurring [Member] | Level 1 [Member] | Mutual funds [Member] |  |
Assets |  |
Assets measured at fair value, Adjusted cost | 1,483 | 1,483
Assets measured at fair value, Unrealized gains | 0 | 0
Assets measured at fair value, Unrealized losses | (148) | (159)
Asset measured at, fair value | 1,335 | 1,324
Recurring [Member] | Level 2 [Member] |  |
Assets |  |
Assets measured at fair value, Adjusted cost | 3,638 | 5,963
Assets measured at fair value, Unrealized gains | 13 | 9
Assets measured at fair value, Unrealized losses | (304) | (502)
Asset measured at, fair value | 3,347 | 5,470
Recurring [Member] | Level 2 [Member] | Corporate fixed income [Member] |  |
Assets |  |
Assets measured at fair value, Adjusted cost | 2,297 | 4,288
Assets measured at fair value, Unrealized gains | 13 | 9
Assets measured at fair value, Unrealized losses | (224) | (408)
Asset measured at, fair value | 2,086 | 3,889
Recurring [Member] | Level 2 [Member] | Municipal bonds [Member] |  |
Assets |  |
Assets measured at fair value, Adjusted cost | 1,341 | 1,675
Assets measured at fair value, Unrealized gains | 0 | 0
Assets measured at fair value, Unrealized losses | (80) | (94)
Asset measured at, fair value | 1,261 | 1,581
Recurring [Member] | Level 3 [Member] |  |
Liabilities |  |
Liabilities Measured at Fair Value Adjusted Cost | 0 | 0
Liabilities measured at fair value, Unrealized gains | 0 | 0
Liabilities measured at fair value, Unrealized losses | 0 | 0
Liabilities measured at fair value | 35,077 | 35,077
Recurring [Member] | Level 3 [Member] | Contingent consideration [Member] |  |
Liabilities |  |
Liabilities Measured at Fair Value Adjusted Cost | 0 | 0
Liabilities measured at fair value, Unrealized gains | 0 | 0
Liabilities measured at fair value, Unrealized losses | 0 | 0
Liabilities measured at fair value | $ 35,077 | $ 35,077

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