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Note 3 - Acquisitions (Details Textual) $ in Thousands			12 Months Ended
	Mar. 01, 2016 USD ($)	Aug. 01, 2015 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Payments to Acquire Businesses, Net of Cash Acquired			$ (1,257)	$ 61,386	$ 73,782
Goodwill			$ 721,523	704,640	669,719
Business Acquisition, Pro Forma Revenue				$ 1,473,799	$ 1,566,459
Pramac [Member]
Business Acquisition, Percentage of Voting Interests Acquired	65.00%
Payments to Acquire Businesses, Net of Cash Acquired	$ 60,250
Number of Countries Where Product is Sold by Subsidiary	150		150
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	35.00%
Redeemable Noncontrolling Interest, Equity, Fair Value	$ 34,253
Noncontrolling Interest, Term of Put Option	5 years
Noncontrolling Interest, Term of Put Option in which Option Price is Fixed	2 years
Goodwill	$ 46,775
CHP [Member]
Payments to Acquire Businesses, Net of Cash Acquired		$ 74,570
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill		75,174
Goodwill		36,284
Noncash or Part Noncash Acquisition, Debt Assumed		$ 12,000

X

- Definition

The amount of acquisition cost of a business combination allocated to an identifiable intangible asset including goodwill.

+ References

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- Definition

The term of a put option available to the noncontrolling interest of a business acquired by the reporting entity.

+ References

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The term in which the price a put option available to the noncontrolling interest of a business acquired by the reporting entity is fixed.

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- Definition

Represents the number of countries in where the subsidiary sells its products.

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Paragraph 1
-Subparagraph (a)
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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The aggregate fair value as of the reporting date of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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