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Acquisitions (Details 4) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Intangible Assets Subject to Amortization: | $ 159,445 |  |
Goodwill | $ 186,044 | $ 21,065 | $ 16,803
Series of Individually Immaterial Business Acquisitions [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Current Assets |  | 5,949 |
Property, Plant and Equipment |  | 4,112 |
Intangible Assets Subject to Amortization: |  | 6,055 |
Goodwill |  | 1,739 |
Other Assets |  | 7 |
Total Identifiable Assets Acquired |  | 17,862 |
Current Liabilities |  | 4,764 |
Other Liabilities |  | 53 |
Total Identifiable Liabilities Assumed |  | 4,817 |
Net Assets Acquired |  | $ 13,045 |

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