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Quarterly Financial Data (Summary Of Quarterly Financial Data) (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
Quarterly Financial Data [Abstract]                      
Total Revenue $ 1,607,710 $ 1,601,414 $ 1,364,738 $ 1,410,772 $ 1,440,224 $ 1,403,697 $ 1,434,231 $ 1,308,217 $ 5,984,634 $ 5,586,369 $ 4,864,985
Income (loss) from operations 116,886 107,096 (4,939) 71,121 98,156 115,621 120,020 110,161 290,164 443,958 258,368
Net income $ 190,959 $ 80,244 $ 8,175 $ 76,388 $ 72,416 $ 98,582 $ 91,028 $ 88,132 $ 355,766 $ 350,158 $ 176,553
Basic earnings per share $ 6.82 $ 2.87 $ 0.29 $ 2.75 $ 2.61 $ 3.55 $ 3.28 $ 3.18 $ 12.74 $ 12.62 $ 6.35
Diluted earnings per share $ 6.69 $ 2.82 $ 0.29 $ 2.70 $ 2.55 $ 3.47 $ 3.22 $ 3.13 $ 12.52 $ 12.38 $ 6.31