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Selected Quarterly Financial Information (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 791,623 $ 612,196 $ 616,793 $ 606,118 $ 595,088 $ 591,542 $ 604,124 $ 610,065 $ 2,626,730 $ 2,400,819 $ 2,199,259
Operating Income (Loss) 94,684 69,568 96,258 94,774 80,477 78,940 89,554 94,830 355,284 343,801 260,408
Income from continuing operations, net of tax 22,867 11,837 38,598 41,399 82,073 23,157 27,692 35,076 114,701 167,998 207,701
Income from discontinued operations, net of tax 0 0 347 0 0 0 21,017 375 347 21,392 212,530
Net Income (Loss) Attributable to Parent $ 22,867 $ 11,837 $ 38,945 $ 41,399 $ 82,073 $ 23,157 $ 48,709 $ 35,451 $ 115,048 $ 189,390 $ 420,231
Continuing operations $ 0.21 $ 0.10 $ 0.34 $ 0.36 $ 0.72 $ 0.20 $ 0.24 $ 0.31 $ 1.01 $ 1.46 $ 1.81
Discontinued operations 0.00 0 0 0.00 0.00 0 0.18 0.00 0.00 0.19 1.86
Basic net income per common share 0.21 0.10 0.34 0.36 0.72 0.20 0.42 0.31 1.01 1.65 3.67
Continuing operations 0.20 0.10 0.34 0.36 0.71 0.20 0.24 0.31 1.00 1.45 1.80
Discontinued operations 0.00 0 0 0.00 0.00 0 0.18 0.00 0.00 0.19 1.85
Diluted net income per common share $ 0.20 $ 0.10 $ 0.34 $ 0.36 $ 0.71 $ 0.20 $ 0.42 $ 0.31 $ 1.00 $ 1.64 $ 3.65