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Note 2 - Acquisitions & Divestitures - Business Acquisition Income Statement Supplemental 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, pro forma                     $ 3,293,658
Net income from continuing operations, net of tax $ 83,287 $ 38,116 $ (108,544) $ (147,559) $ 24,296 $ 39,405 $ 48,484 $ 45,451 $ (134,700) $ 157,636 115,048
Net income from continuing operations, net of tax, pro forma                     $ 131,290
Basic net income per 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
Basic net income per share, pro forma (in dollars per share)                     1.15
Diluted net income per 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
Diluted net income per share, pro forma (in dollars per share)                     $ 1.14
Parent Company [Member]                      
Total revenues                     $ 2,626,730
Net income from continuing operations, net of tax                     $ 114,701
Basic net income per share (in dollars per share)                     $ 1.01
Diluted net income per share (in dollars per share)                     $ 1.00
Subsidiaries [Member]                      
Total revenues                     $ 666,928
Net income from continuing operations, net of tax                     $ 16,589