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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, 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 |  | 136,139 | 137,810
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 before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Basic |  | $ 1.86 | $ 1.78
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted |  | $ 1.84 | $ 1.75
Pro Forma Weighted Average Shares Outstanding, Diluted |  | 137,804 | 140,112
Two Thousand Fifteen Acquisitions [Member] |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |
Weighted Average Basic Shares Outstanding, Pro Forma |  |  | 137,810
Business Acquisition, Pro Forma Revenue |  |  | $ 1,688,297
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax |  |  | 411,497
Business Acquisition, Pro Forma Net Income (Loss) |  |  | $ 248,720
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Basic |  |  | $ 1.76
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted |  |  | $ 1.73
Pro Forma Weighted Average Shares Outstanding, Diluted |  |  | 140,112
Two Thousand Seventeen Acquisition [Member] [Domain] |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |
Weighted Average Basic Shares Outstanding, Pro Forma | 136,290 | 136,139 |
Business Acquisition, Pro Forma Revenue | $ 1,891,701 | $ 1,784,776 |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax | 453,397 | 429,490 |
Business Acquisition, Pro Forma Net Income (Loss) | $ 401,908 | $ 261,133 |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Basic | $ 2.88 | $ 1.87 |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted | $ 2.83 | $ 1.85 |
Pro Forma Weighted Average Shares Outstanding, Diluted | 138,793 | 137,804 |

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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=65885119&loc=d3e1392-128463 + Details
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