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Summary of Signficant Accounting Policies Finite-Lived Intangible Assets Acquired As Part Of Business Combination, Remaining Useful Life (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 16 years 6 months
Customer and supplier relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 11 years 2 months 12 days
Customer and supplier relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 18 years 7 months 6 days
Computer Software, Intangible Asset [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 11 years 1 month 6 days
Covenants not to compete [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 4 years 4 months 24 days
All 2018 Acquisitions excluding Stahlgruber [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 8 years 6 months |
All 2018 Acquisitions excluding Stahlgruber [Member] | Customer and supplier relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 10 years |
All 2018 Acquisitions excluding Stahlgruber [Member] | Customer and supplier relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 7 years 10 months 24 days |
All 2018 Acquisitions excluding Stahlgruber [Member] | Computer Software, Intangible Asset [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 6 years 6 months |
Stahlgruber [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 12 years 4 months 24 days |
Stahlgruber [Member] | Customer and supplier relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 18 years |
Stahlgruber [Member] | Customer and supplier relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 3 years |
Stahlgruber [Member] | Computer Software, Intangible Asset [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 5 years 2 months 12 days |
All 2018 Acquisitions [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 12 years |
All 2018 Acquisitions [Member] | Customer and supplier relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 17 years 7 months 6 days |
All 2018 Acquisitions [Member] | Customer and supplier relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 4 years |
All 2018 Acquisitions [Member] | Computer Software, Intangible Asset [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 5 years 2 months 12 days |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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