Note 14 - Capital Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2016	Aug. 31, 2015	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jun. 29, 2016	Jun. 18, 2015
Class of Stock [Line Items]
Stock Repurchased During Period, Shares		1,800,000		9,200,000
Payments for Repurchase of Common Stock						$ 100,188	$ 202,000	$ 0
Accelerated Share Repurchases, Final Price Paid Per Share		$ 18.32
Stock Repurchase Program, Authorized Amount										$ 202,000
Convertible Senior Notes Due 2017
Class of Stock [Line Items]
Debt Conversion, Converted Instrument, Shares Issued			28,400,000
Convertible Debt, Termination of Capped Call Transaction, Number of Shares Received			2,300,000
Convertible Debt [Member]
Class of Stock [Line Items]
Debt Conversion, Converted Instrument, Shares Issued						17,000,000
Convertible Debt, Termination of Capped Call Transaction, Number of Shares Received	200,000
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
Accelerated Share Repurchases, Final Price Paid Per Share						$ 10.62
Second Quarter 2016 Repurchase Program [Member]
Class of Stock [Line Items]
Stock Repurchased During Period, Shares					0
Stock Repurchase Program, Authorized Amount					$ 125,000	$ 125,000			$ 125,000