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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Data (Unaudited) [Abstract]                      
Revenue $ 809,053 $ 721,467 $ 751,398 $ 749,219 $ 769,280 $ 714,453 $ 754,219 $ 748,089 $ 3,031,137 $ 2,986,041 $ 2,994,011
Costs and expenses (598,276) (580,722) (589,409) (586,296) (581,478) (572,774) (587,452) (569,748) (2,354,703) (2,311,452) (2,318,326)
Gross profits 210,777 140,745 161,989 162,923 187,802 141,679 166,767 178,341 676,434 674,589 675,685
Operating income 179,329 114,386 94,498 123,672 157,055 124,548 127,580 141,115 511,885 550,298 607,549
Income from continuing operations before income taxes 139,289 [1] 74,963 [1] 32,639 [1] 79,767 [1] 113,699 [1] 74,045 [1] 84,489 [1] 98,118 [1] 326,658 370,351 402,600
Provision for income taxes (72,872) (27,422) (16,746) (32,313) (41,249) (26,118) (31,007) (36,653) 149,353 135,027 225,980
Net income from continuing operations         72,450 47,927 53,482 61,465 177,305 235,324 176,620
Net loss from discontinued operations, net of tax         0 0 (390) 0 0 (390) 2,186
Net income 66,417 47,541 15,893 47,454 72,450 47,927 53,092 61,465 177,305 234,934 178,806
Net income attributable to noncontrolling interests (171) 186 (273) (9) (96) (479) (497) (90) (267) (1,162) (6,337)
Net income attributable to common stockholders $ 66,246 $ 47,727 $ 15,620 $ 47,445 $ 72,354 $ 47,448 $ 52,595 $ 61,375 $ 177,038 $ 233,772 $ 172,469
Basic — EPS $ 0.35 [2] $ 0.25 [2] $ 0.08 [2] $ 0.24 [2] $ 0.37 [2] $ 0.24 [2] $ 0.26 [2] $ 0.30 [2] $ 0.92 $ 1.17 $ 0.82
Earnings per share, diluted $ 0.34 [2] $ 0.24 [2] $ 0.08 [2] $ 0.24 [2] $ 0.36 [2] $ 0.23 [2] $ 0.25 [2] $ 0.30 [2] $ 0.90 $ 1.14 $ 0.81
[1] Includes (Losses) gains on divestitures and impairment charges, net, as described in Note 19.
[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.