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Note 13 - Capital Stock (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2016 | Sep. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Jun. 29, 2016
Class of Stock [Line Items] |  |  |  |  |  |
Payments for Repurchase of Common Stock |  |  |  | $ 100,188,000 | $ 202,000,000 |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  | $ 125,000,000
Convertible Senior Notes Due 2017 |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Convertible Debt, Termination of Capped Call Transaction, Number of Shares Received | 200,000 |  |  |  |  |
Convertible Debt |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued |  |  |  | 17,000,000 |  |
First Quarter 2016 Repurchase Program [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock Repurchased During Period, Shares |  |  |  | 9,400,000 |  |
Payments for Repurchase of Common Stock |  |  |  | $ 100,200,000 |  |
Accelerated Share Repurchases, Final Price Paid Per Share |  |  | $ 10.62 |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 0 |  | 0 |  |
Second Quarter 2016 Repurchase Program [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock Repurchased During Period, Shares |  | 0 |  |  |  |
Stock Repurchase Program, Authorized Amount |  | $ 125,000,000 |  | $ 125,000,000 |  | $ 125,000,000

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