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Note 2 - Acquisitions & Divestitures - Business Acquisition Income Statement Supplemental Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Total revenues, pro forma               $ 2,476,219
Net income $ 39,405 $ 48,484 $ 45,451 $ 11,837 $ 38,945 $ 41,399 $ 133,340 92,181
Net income from continuing operations, net of tax, pro forma               $ 99,337
Basic net income per share (in dollars per share) $ 0.35     $ 0.10     $ 1.18 $ 0.81
Basic net income per share, pro forma (in dollars per share)               0.87
Diluted net income per share (in dollars per share) $ 0.35     $ 0.10     $ 1.17 0.80
Diluted net income per share, pro forma (in dollars per share)               $ 0.86
Parent Company [Member]                
Total revenues               $ 1,835,107
Net income               $ 91,834
Basic net income per share (in dollars per share)               $ 0.81
Diluted net income per share (in dollars per share)               $ 0.80
Subsidiaries [Member]                
Total revenues               $ 641,112
Net income               $ 7,503