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Summary of Significant Accounting Policies - Revenue - Summary of Condensed Consolidated Statements of Operations (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
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,061,489 | $ 1,060,991 | $ 1,060,823 | $ 1,042,458 | $ 991,235 | $ 965,661 | $ 949,806 | $ 938,876 | $ 4,225,761 | $ 3,845,578 | $ 3,511,453
Operating income (loss) | 191,844 | 195,746 | 203,359 | 164,559 | 154,405 | 176,756 | 170,194 | 147,755 | 755,508 | 649,109 | 501,606
Income from Continuing Operations | $ 158,831 | $ 78,628 | $ 93,903 | $ 45,614 | $ 24,349 | $ 25,382 | $ 83,148 | $ 58,844 | $ 376,976 | $ 191,723 | $ 103,880
Income (Loss) from Continuing Operations (in dollars per share) | $ 0.55 | $ 0.28 | $ 0.33 | $ 0.16 | $ 0.09 | $ 0.10 | $ 0.31 | $ 0.22 | $ 1.31 | $ 0.71 | $ 0.41
Income (Loss) from Continuing Operations - Diluted (in dollars per share) | $ 0.55 | $ 0.27 | $ 0.33 | $ 0.16 | $ 0.09 | $ 0.10 | $ 0.30 | $ 0.22 | $ 1.31 | $ 0.71 | $ 0.41
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 4,219,663 |  |
Operating income (loss) |  |  |  |  |  |  |  |  | 751,648 |  |
Income from Continuing Operations |  |  |  |  |  |  |  |  | $ 373,113 |  |
Income (Loss) from Continuing Operations (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.30 |  |
Income (Loss) from Continuing Operations - Diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.30 |  |

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