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Note 13 - Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Balance as of December 31, 2018	$ 1,066,928
Foreign currency translation adjustment	384
Balance at March 31, 2019	1,083,421
AOCI Attributable to Parent [Member]
Balance as of December 31, 2018
Foreign currency translation adjustment	384
Balance at March 31, 2019	$ 384

X

- Definition

Amount after tax of other comprehensive income (loss) attributable to parent entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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X

- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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