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Note 9 - Stockholders' Equity and Stock Incentive Plans (Details Textual) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 12, 2018
Share-based Payment Arrangement, Expense	$ 8,158		$ 6,022		$ 17,867	$ 14,949
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period		395,964		486,805
Shares Issued Per Unit		1.67		1.57
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation		125,004		149,268
Share Based Payment Arrangement, Shares Issued In Period, Net of Tax Withholdings		270,960		337,537
Share-based Payment Arrangement, Expense		$ 0		$ 0
The 2018 Plan [Member]
Stock Repurchase Program, Authorized Amount							$ 100,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 72,800				$ 72,800

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- Definition

Shares issued during the period net of tax withholding for share based payment arrangements

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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