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Quarterly Financial Data Quarterly Financial Data Level 4 (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 (Unaudited) [Abstract]                      
Revenue $ 812,733 $ 731,346 $ 773,242 $ 777,710 $ 809,053 $ 721,467 $ 751,398 $ 749,219 $ 3,095,031 $ 3,031,137 $ 2,986,041
Costs and expenses (600,856) (581,644) (589,797) (600,545) (598,276) (580,722) (589,409) (586,296) (2,372,842) (2,354,703) (2,311,452)
Gross profits 211,877 149,702 183,445 177,165 210,777 140,745 161,989 162,923 722,189 676,434 674,589
Operating income 176,937 109,056 143,608 139,596 179,329 114,386 94,498 123,672 569,197 511,885 550,298
Income from continuing operations before income taxes 133,636 [1] 66,578 [1] 101,518 [1] 98,526 [1] 139,289 [1] 74,963 [1] 32,639 [1] 79,767 [1] 400,258 326,658 370,351
Provision for income taxes 113,759 (10,437) (32,956) 76,223 (72,872) (27,422) (16,746) (32,313) (146,589) 149,353 135,027
Net income from continuing operations                 546,847 177,305 235,324
Net loss from discontinued operations, net of tax                 0 0 (390)
Net income 247,395 56,141 68,562 174,749 66,417 47,541 15,893 47,454 546,847 177,305 234,934
Net income attributable to noncontrolling interests (79) 23 (81) (47) (171) 186 (273) (9) (184) (267) (1,162)
Net income attributable to common stockholders $ 247,316 $ 56,164 $ 68,481 $ 174,702 $ 66,246 $ 47,727 $ 15,620 $ 47,445 $ 546,663 $ 177,038 $ 233,772
Basic — EPS $ 1.32 [2] $ 0.30 [2] $ 0.37 [2] $ 0.93 [2] $ 0.35 [2] $ 0.25 [2] $ 0.08 [2] $ 0.24 [2] $ 2.91 $ 0.92 $ 1.17
Earnings per share, diluted $ 1.29 [2] $ 0.29 [2] $ 0.36 [2] $ 0.91 [2] $ 0.34 [2] $ 0.24 [2] $ 0.08 [2] $ 0.24 [2] $ 2.84 $ 0.90 $ 1.14
[1] Includes Gains (losses) on divestitures and impairment charges, net, as described in Note 16.
[2] Net income per share is computed independently for each of the quarters presented. Therefore, the sum of the quarters’ net income per share may not equal the total computed for the year.