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Note 15 - Selected Quarterly Financial Information (Unaudited) - Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Total revenues $ 635,868 $ 652,238 $ 209,859 $ 680,525 $ 833,131 $ 819,568 $ 846,132 $ 827,288 $ 2,178,490 $ 3,326,119 $ 2,626,730
Operating income (loss) 111,299 127,073 (86,348) (137,761) 114,859 113,391 126,692 117,626 14,263 472,568 355,284
Net income (loss) $ 83,287 $ 38,116 $ (108,544) $ (147,559) $ 24,296 $ 39,405 $ 48,484 $ 45,451 $ (134,700) $ 157,636 $ 115,048
Basic net income (loss) per common share (in dollars per share) $ 0.73 $ 0.34 $ (0.96) $ (1.30) $ 0.21 $ 0.35 $ 0.43 $ 0.40 $ (1.19) $ 1.39 $ 1.01
Diluted net income (loss) per common share (in dollars per share) $ 0.73 $ 0.33 $ (0.96) $ (1.30) $ 0.21 $ 0.35 $ 0.43 $ 0.40 $ (1.19) $ 1.38 $ 1.00