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Quarterly Information (Unaudited) - Summary (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
QUARTERLY INFORMATION                      
Revenue $ 2,276,549 $ 2,223,932 $ 2,244,993 $ 2,180,327 $ 2,260,155 $ 2,159,682 $ 2,089,904 $ 1,904,205 $ 8,925,801 $ 8,413,946 $ 7,280,074
Earnings (Loss) from Continuing Operations Before Income Taxes (122,231) (91,260) 103,069 68,151 116,013 118,863 101,894 52,699 (42,271) 389,469 296,436
Earnings (Loss) from Continuing Operations (53,076) (91,538) 75,452 45,890 111,838 91,602 46,169 37,313 (23,272) 286,922 720,101
Net Earnings (Loss) $ (53,486) $ (91,455) $ 75,215 $ 45,316 $ 111,977 $ 90,842 $ 44,908 $ 36,886 $ (24,410) $ 284,613 $ 719,644
Earnings (Loss) from Continuing Operations per Common Share                      
Earnings from continuing operations per common share — Basic (USD per share) $ (1.02) $ (1.75) $ 1.44 $ 0.87 $ 2.13 $ 1.74 $ 0.88 $ 0.71 $ (0.45) $ 5.46 $ 13.64
Earnings from continuing operations per common share — Diluted (USD per share) (1.02) (1.75) 1.43 0.87 2.12 1.73 0.87 0.70 (0.45) 5.43 13.54
Net Earnings (Loss) per Common Share                      
Basic (USD per share) (1.02) (1.75) 1.43 0.86 2.13 1.73 0.85 0.70 (0.47) 5.41 13.63
Diluted (USD per share) $ (1.02) $ (1.75) $ 1.43 $ 0.86 $ 2.12 $ 1.72 $ 0.85 $ 0.70 $ (0.47) $ 5.38 $ 13.53