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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Data [Abstract]                      
Revenue $ 1,110,100 $ 1,128,074 $ 1,169,409 $ 1,068,829 $ 1,034,560 $ 1,036,982 $ 998,383 $ 834,459 $ 4,476,412 $ 3,904,384 $ 4,501,223
Operating income (loss) 60,029 30,867 106,725 73,173 30,550 9,726 40,895 (46,604) 270,794 34,567 763,589
Net income (loss) $ 43,793 $ 19,610 $ 66,730 $ 46,120 $ 15,975 $ 7,799 $ 25,596 $ (26,432) $ 176,253 $ 22,938 $ 475,602
Basic earnings (loss) per share $ 1.56 $ 0.69 $ 2.33 $ 1.60 $ 0.55 $ 0.27 $ 0.88 $ (0.88) $ 6.19 $ 0.78 $ 15.30
Diluted earnings (loss) per share $ 1.55 $ 0.69 $ 2.32 $ 1.60 $ 0.55 $ 0.27 $ 0.87 $ (0.88) $ 6.17 $ 0.77 $ 15.10