Note 18 - 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		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net (loss) income allocated to common shareholders for basic calculation		$ (145,117)	$ (60,191)	$ 582
Weighted average common shares outstanding, basic (in shares)		45,614	46,559	43,564
Dilutive effect of RSUs and convertible notes (1),(2) (in shares)	[1],[2]	0	0	461
Weighted average common shares outstanding, diluted (in shares)		45,614	46,559	44,025
Net (loss) income per share, basic (in dollars per share)		$ (3.18)	$ (1.29)	$ 0.01
Net (loss) income per share, diluted (in dollars per share)		$ (3.18)	$ (1.29)	$ 0.01

[1] As our average stock price since the issuance date of the 2.75% Convertible Notes was below $31.47 per share, the number of shares used in calculating diluted net loss per share for the year ended December 31, 2020 did not include potential dilution from the 2.75% Convertible Notes converting into shares of common stock (See Note 14 for further details).

[2] Due to the net losses for the years ended December 31, 2020 and 2019, RSUs representing approximately 589,000 and 388,000 shares, respectively, have been excluded from the number of shares used in calculating diluted net loss per share, as their inclusion would be antidilutive.