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Business Combinations Business Acquisitions - Pro-forma Table (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Two Thousand Sixteen Acquisition [Member] |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
Weighted Average Basic Shares Outstanding, Pro Forma |  |  | 272,278 | 275,620
Business Acquisition, Pro Forma Revenue |  |  | $ 1,789,790 | $ 1,716,592
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax |  |  | 428,194 | 414,911
Business Acquisition, Pro Forma Net Income (Loss) |  |  | $ 260,346 | $ 250,783
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax, Per Share, Basic |  |  | $ 0.93 | $ 0.89
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted |  |  | $ 0.92 | $ 0.87
Pro Forma Weighted Average Shares Outstanding, Diluted |  |  | 275,608 | 280,224
Two Thousand Eighteen Acquisition [Member] |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
Weighted Average Basic Shares Outstanding, Pro Forma | 270,971 | 272,580 |  |
Business Acquisition, Pro Forma Revenue | $ 2,259,812 | $ 2,193,169 |  |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax | 504,664 | 503,927 |  |
Business Acquisition, Pro Forma Net Income (Loss) | $ 375,670 | $ 447,796 |  |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax, Per Share, Basic | $ 1.35 | $ 1.60 |  |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted | $ 1.33 | $ 1.57 |  |
Pro Forma Weighted Average Shares Outstanding, Diluted | 275,521 | 277,586 |  |

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- Definition Per diluted share amount of pro forma income from continuing operations, after tax, as if the business combination had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount after tax of pro forma income from continuing operations as if the business combination had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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