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Acquisitions Business Combinations (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 01, 2017
Business Acquisition [Line Items] |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | $ (18,674) | $ 0 | $ 0 |
Goodwill, Acquired During Period | 558 | 52,229 |  |
Amortization of Intangible Assets | 14,300 | 11,500 | 8,300 |
BIOTIX [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Consideration Transferred |  | 105,000 |  |
Business Combination, Contingent Consideration, Liability |  |  |  | $ 30,700
Payment for Contingent Consideration Liability, Financing Activities | 10,000 |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | 18,700 |  |  |
Goodwill, Acquired During Period |  | 51,700 |  |
Amortization of Intangible Assets |  | 3,700 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | $ 18,800 |  |
Minimum Weighted Average Useful Lives |  | 5 years |  |
Maximum Weighted Average Useful Lives |  | 18 years |  |
Other Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Consideration Transferred | 5,500 | $ 3,800 | 111,400 |
Goodwill, Acquired During Period | 600 | 300 |  |
Finite-lived Intangible Assets Acquired | $ 4,900 | $ 3,100 |  |
Maximum Weighted Average Useful Lives | 10 years | 12 |  |
Henry Troemner, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Consideration Transferred |  |  | 95,800 |
Goodwill, Acquired During Period |  |  | 41,300 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  | $ 60,100 |
Minimum Weighted Average Useful Lives |  |  | 3 years |
Maximum Weighted Average Useful Lives |  |  | 25 years |
Customer Relationships [Member] | BIOTIX [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  | $ 49,500 |  |
Technology-Based Intangible Assets [Member] | BIOTIX [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  | 8,000 |  |
Other Intangible Assets [Member] | BIOTIX [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  | 600 |  |
Trade Names [Member] | BIOTIX [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  | $ 7,100 |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
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