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Acquisitions - Estimated Fair Values of Identifiable Intangible Assets and Related Weighted Average Amortization (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2019
Business Acquisition [Line Items] |  |
Estimated fair value at acquisition date |  | $ 39,900
Acquisitions 2019 |  |
Business Acquisition [Line Items] |  |
Estimated fair value at acquisition date | $ 7,337 |
Weighted average amortization period at acquisition date | 5 years 3 months 18 days |
Customer relationships | Acquisitions 2019 |  |
Business Acquisition [Line Items] |  |
Estimated fair value at acquisition date | $ 3,996 |
Weighted average amortization period at acquisition date | 5 years |
Backlog | Acquisitions 2019 |  |
Business Acquisition [Line Items] |  |
Estimated fair value at acquisition date | $ 1,058 |
Weighted average amortization period at acquisition date | 1 year |
Trade names | Acquisitions 2019 |  |
Business Acquisition [Line Items] |  |
Estimated fair value at acquisition date | $ 908 |
Weighted average amortization period at acquisition date | 15 years |
Non-compete agreements | Acquisitions 2019 |  |
Business Acquisition [Line Items] |  |
Estimated fair value at acquisition date | $ 1,375 |
Weighted average amortization period at acquisition date | 3 years |

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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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