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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Revenues | $ 1,060,823 | $ 949,806 | $ 2,103,281 | $ 1,888,682
Operating Income | 203,359 | 170,194 | 367,918 | 317,949
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | 93,903 | 83,148 | 139,517 | 141,992
Income from Continuing Operations | $ 120,308 | $ 99,594 | $ 167,090 | $ 167,658
Income (Loss) from continuing operations (in dollars per share) | $ 0.33 | $ 0.31 | $ 0.49 | $ 0.53
Income (Loss) from continuing operations (in dollars per share) | $ 0.33 | $ 0.30 | $ 0.49 | $ 0.53
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Revenues | $ 1,057,608 |  | $ 2,098,872 |
Operating Income | 201,664 |  | 366,983 |
Income from Continuing Operations | $ 92,208 |  | $ 138,582 |
Income (Loss) from continuing operations (in dollars per share) | $ 0.32 |  | $ 0.48 |
Income (Loss) from continuing operations (in dollars per share) | $ 0.32 |  | $ 0.48 |

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