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Acquisitions (Details) - USD ($) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Apr. 02, 2018 | Sep. 30, 2018
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets | $ 194,850 |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 10 years 6 months
Customer Contractual Relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 13 years |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 141,400 |
Backlog [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 1 year |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 26,100 |
Noncompete Agreements [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 10,350 |
Favorable Contracts [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 500 |
Trademarks [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 16,500 |
Minimum [Member] | Customer Contractual Relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life |  | 2 years
Minimum [Member] | Backlog [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life |  | 1 year
Minimum [Member] | Noncompete Agreements [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 4 years | 2 years
Minimum [Member] | Favorable Contracts [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life |  | 5 years
Maximum [Member] | Customer Contractual Relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life |  | 13 years
Maximum [Member] | Noncompete Agreements [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 7 years | 7 years

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