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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Two Thousand Fifteen Acquisitions [Member] |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
Weighted Average Basic Shares Outstanding, Pro Forma | 137,810 | 140,944 |  |
Business Acquisition, Pro Forma Revenue | $ 1,688,297 | $ 1,630,992 |  |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax | 411,497 | 356,426 |  |
Business Acquisition, Pro Forma Net Income (Loss) | $ 248,720 | $ 217,053 |  |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Basic | $ 1.76 | $ 1.50 |  |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted | $ 1.73 | $ 1.48 |  |
Pro Forma Weighted Average Shares Outstanding, Diluted | 140,112 | 142,891 |  |
Two Thousand Fourteen Acquisitions [Member] |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
Weighted Average Basic Shares Outstanding, Pro Forma |  | 140,944 | 141,033 |
Business Acquisition, Pro Forma Revenue |  | $ 1,630,162 | $ 1,520,858 |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax |  | 358,229 | 409,522 |
Business Acquisition, Pro Forma Net Income (Loss) |  | $ 218,150 | $ 248,628 |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Basic |  | $ 1.51 | $ 1.72 |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted |  | $ 1.49 | $ 1.70 |
Pro Forma Weighted Average Shares Outstanding, Diluted |  | 142,891 | 142,624 |
Two Thousand Thirteen Acquisitions [Member] |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
Weighted Average Basic Shares Outstanding, Pro Forma |  |  | 141,033 | 139,634
Business Acquisition, Pro Forma Revenue |  |  | $ 1,439,918 | $ 1,329,262
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax |  |  | 373,175 | 329,291
Business Acquisition, Pro Forma Net Income (Loss) |  |  | $ 226,562 | $ 198,826
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Basic |  |  | $ 1.57 | $ 1.39
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted |  |  | $ 1.55 | $ 1.36
Pro Forma Weighted Average Shares Outstanding, Diluted |  |  | 142,624 | 142,010

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- Definition The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect per basic share of common stock for a period as if the business combination or combinations 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=25497992&loc=d3e1392-128463 + Details
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- Definition The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, per diluted share of common stock for a period as if the business combination or combinations 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=25497992&loc=d3e1392-128463 + Details
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