Note 16 - Weighted Average Shares Outstanding and Net (Loss) Income Per Share - Reconciliation of the Weighted Average Shares Outstanding in Basic and Diluted Net Loss per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net income (loss) allocated to common shareholders for basic calculation		$ (91,162)	$ 45,901	$ (153,127)	$ (40,811)
Weighted average common shares outstanding, basic (in shares)		45,654	46,788	45,598	46,771
Dilutive effect of RSUs and 2.75% Convertible Notes (1),(2) (in shares)	[1],[2]	0	382	0	0
Weighted average common shares outstanding, diluted (in shares)		45,654	47,170	45,598	46,771
Net income (loss) per share, basic (in dollars per share)		$ (2.00)	$ 0.98	$ (3.36)	$ (0.87)
Net income (loss) per share, diluted (in dollars per share)		$ (2.00)	$ 0.97	$ (3.36)	$ (0.87)

[1] As the average price of our common stock was below $31.47 per share since the issuance date of the 2.75% Convertible Notes, the number of shares used in calculating diluted net income (loss) per share for the three and nine months ended September 30, 2020 excluded the potential dilution from the 2.75% Convertible Notes converting into shares of common stock.

[2] Due to the net losses, RSUs representing approximately 636,000, 580,000 and 393,000 for the three and nine months ended September 30, 2020 and nine months ended September 30, 2019, respectively, have been excluded from the number of shares used in calculating diluted net loss per share, as their inclusion would be antidilutive.