v3.8.0.1

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 14,571	$ 27,534	$ 29,859	$ (3,637)	$ 6,663	$ 54,755	$ 41,646	$ (27,577)	$ 68,327	$ 75,487	$ 32,288
Other comprehensive income (loss), net of tax:
Currency translation									3,765	2,950	(14,690)
Unrealized gain on derivative instruments									(853)	29	(465)
Minimum pension liability for actuarial gain (loss)									610	295	(1,436)
Other comprehensive income (loss)									3,522	3,274	(16,591)
Comprehensive income									$ 71,849	$ 78,761	$ 15,697

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount, after tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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