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Note 2 - Acquisitions & Divestitures - Business Acquisition Income Statement Supplemental Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Total revenues, pro forma         $ 1,657,216  
Net income $ 48,484 $ 45,451 $ 38,945 $ 41,399 93,935 $ 80,344
Net income from continuing operations, net of tax, pro forma         $ 82,660  
Basic net income per share (in dollars per share) $ 0.43   $ 0.34   $ 0.83 $ 0.70
Basic net income per share, pro forma (in dollars per share)         0.72  
Diluted net income per share (in dollars per share) $ 0.43   $ 0.34   0.83 $ 0.70
Diluted net income per share, pro forma (in dollars per share)         $ 0.72  
Parent Company [Member]            
Total revenues         $ 1,222,911  
Net income         $ 79,997  
Basic net income per share (in dollars per share)         $ 0.70  
Diluted net income per share (in dollars per share)         $ 0.70  
Subsidiaries [Member]            
Total revenues         $ 434,305  
Net income         $ 2,663