Note 13 - Capital Stock (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Mar. 31, 2016	Mar. 31, 2016	Jun. 30, 2016	Jun. 30, 2015
Class of Stock [Line Items]
Stock Repurchased During Period, Shares		9.4
Payments for Repurchase of Common Stock		$ 100,200	$ 100,188	$ 202,000
Accelerated Share Repurchases, Final Price Paid Per Share		$ 10.62
Convertible Debt
Class of Stock [Line Items]
Debt Conversion, Converted Instrument, Shares Issued			17.0
Convertible Debt, Termination of Capped Call Transaction, Number of Shares Received	0.2