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Acquisitions and Divestitures Asset Acquisition - Pro Forma (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Business Acquisition, Pro Forma Revenue | $ 3,293,658 | $ 3,262,273
Business Acquisition, Pro Forma Net Income (Loss) | $ 131,290 | $ 172,462
Business Acquisition, Pro Forma Earnings Per Share, Basic | $ 1.15 | $ 1.50
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ 1.14 | $ 1.49
As Previously Reported [Member] |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Business Acquisition, Pro Forma Revenue | $ 2,626,730 | $ 2,400,819
Business Acquisition, Pro Forma Net Income (Loss) | $ 114,701 | $ 167,998
Business Acquisition, Pro Forma Earnings Per Share, Basic | $ 1.01 | $ 1.46
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ 1.00 | $ 1.45
Adjustments [Member] |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Business Acquisition, Pro Forma Revenue | $ 666,928 | $ 861,454
Business Acquisition, Pro Forma Net Income (Loss) | $ 16,589 | $ 4,464

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- Definition The pro forma basic net income per share 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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