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Note 5 - Earnings Per Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Net income | $ 54,321 | $ 72,244 | $ 101,173 | $ 138,923
Weighted-average shares: |  |  |  |
Basic weighted-average number of common shares outstanding (in shares) | 79,581,097 | 80,106,329 | 79,584,587 | 80,279,859
Diluted (in shares) | 79,682,426 | 80,302,679 | 79,756,226 | 80,501,800
Average restricted stock units with anti-dilutive effect (in shares) | 126,084 | 66,339 | 86,741 | 55,502
Basic (in dollars per share) | $ 0.68 | $ 0.90 | $ 1.27 | $ 1.73
Diluted (in dollars per share) | $ 0.68 | $ 0.90 | $ 1.27 | $ 1.73
Restricted Stock Units (RSUs) [Member] |  |  |  |
Weighted-average shares: |  |  |  |
Dilutive effect of weighted-average outstanding common share equivalents RSUs (in shares) | 101,329 | 196,350 | 171,639 | 221,941

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