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Acquisitions - Pro Forma Information Adjustments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2018
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Net income | $ 59,283 | $ 106,247
Amortization |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Net income | 3,298 | 5,185
Transaction costs |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Net income | 0 | 9,976
Amortization of inventory step-up |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Net income | 19,031 | 36,927
Stock compensation |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Net income | 210 | 4,689
Income tax impact of above items |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Net income | $ (5,582) | $ (13,329)

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- Definition The pro forma net Income or Loss for the 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/disclosureRef -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/2003/role/disclosureRef -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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