Note 14 - Weighted Average Shares Outstanding and Net Income (Loss) Per Share - Reconciliation of the Weighted Average Shares Outstanding (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net income (loss) allocated to common shareholders for basic calculation		$ 54,461	$ 3,405	$ (11,734)	$ (61,965)
Weighted average common shares outstanding, basic (in shares)		45,798	45,620	45,748	45,570
Dilutive effect of RSUs (in shares)	[1]	454	661	0	0
Dilutive effect of 2.75% Convertible Notes (in shares)	[2]	1,546	0	0	0
Weighted average common shares outstanding, diluted (in shares)		47,798	46,281	45,748	45,570
Net income (loss) per share, basic (in dollars per share)		$ 1.19	$ 0.07	$ (0.26)	$ (1.36)
Net income (loss) per share, diluted (in dollars per share)		$ 1.14	$ 0.07	$ (0.26)	$ (1.36)

[1] Due to the net losses for the six months ended June 30, 2021 and 2020, RSUs representing approximately 503,000 and 552,000 shares, respectively, have been excluded from the number of shares used in calculating diluted net loss per share, as their inclusion would be antidilutive.

[2] Although the average price of our common stock for the period was greater than the initial conversion price of $31.47 per share, due to the net loss for the six months ended June 30, 2021, approximately 1.0 million shares related to the 2.75% Convertible Notes converting into shares of common stock have been excluded from the number of shares used in calculating diluted net loss per share as their inclusion would be antidilutive. The number of shares used in calculating diluted net income (loss) per share for the three and six months ended June 30, 2020 excluded the potential dilution from the 2.75% Convertible Notes converting into shares of common stock as the average price of our common stock was below $31.47 per share for those periods.