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Quarterly Financial Information (Unaudited) (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
Dec. 31, 2017
Segment Reporting Information [Line Items]                        
Revenues $ 605,652 $ 611,337 $ 599,164 $ 668,442 $ 568,652 $ 537,536 $ 524,944 $ 532,047 $ 2,484,595 $ 2,163,179 $ 2,036,299  
Net Earnings (Loss) from Continuing Operations 42,305 74,643 58,997 57,682 (138,126) 35,611 39,112 38,788 233,627 (24,615) 125,303  
Earnings from Discontinued Operations, Net of Tax (1,487) 34,702 9,380 (337,687) 31,069 4,190 3,538 17,290 (295,092) 56,087 70,907  
Net (Loss) Earnings $ 40,818 $ 109,345 $ 68,377 $ (280,005) $ (107,057) $ 39,801 $ 42,650 $ 56,078 $ (61,465) $ 31,472 $ 196,210  
Continuing Operations (in dollars per share) $ 0.62 $ 1.11 $ 0.88 $ 0.86 $ (2.06) $ 0.53 $ 0.58 $ 0.58 $ 3.47 $ (0.37) $ 1.81  
Discontinued Operations (in dollars per share) (0.02) 0.51 0.14 (5.05) 0.46 0.06 0.05 0.26 (4.39) 0.83 1.03  
Earnings Per Share (in dollars per share) 0.60 1.62 1.02 (4.19) (1.60) 0.59 0.63 0.84 (0.91) 0.47 2.84  
Continuing Operations (in dollars per share) 0.62 1.10 0.87 0.85 (2.06) 0.52 0.57 0.56 3.43 (0.37) 1.77  
Discontinued Operations (in dollars per share) (0.02) 0.51 0.14 (4.98) 0.46 0.06 0.05 0.25 (4.34) 0.83 1.01  
Earnings Per Share Assuming Dilution (in dollars per share) $ 0.60 $ 1.61 $ 1.01 $ (4.13) $ (1.60) $ 0.58 $ 0.62 $ 0.81 $ (0.90) $ 0.47 $ 2.78  
Accounts Receivable, allowances $ 56,364       $ 65,573       $ 56,364 $ 65,573 $ 53,159 $ 39,954