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Acquisitions, Goodwill and Other Long-Lived Assets Estimated Amortization Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Intangible Assets [Line Items] |  |  |
Accumulated Amortization | $ (93,009) | $ (79,520) |
Amortization expense of acquired intangible assets | 13,489 | 10,183 | $ 8,109
Intangible assets, estimated future amortization [Abstract] |  |  |
2021 | 13,464 |  |
2022 | 12,964 |  |
2023 | 12,729 |  |
2024 | 12,604 |  |
2025 | 12,506 |  |
Intangible Assets, Gross (Excluding Goodwill) | 238,041 | 204,377 |
Intangible Assets, Net (Excluding Goodwill) | $ 145,032 | 124,857 |
Maximum [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 20 years |  |
Minimum [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 1 year |  |
Customer Relationships [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Weighted average useful lives of acquired intangible assets | 15 years |  |
Accumulated Amortization | $ 85,930 | 73,868 |
Intangible assets, estimated future amortization [Abstract] |  |  |
Intangible Assets, Gross (Excluding Goodwill) | 228,416 | 196,225 |
Intangible Assets, Net (Excluding Goodwill) | $ 142,486 | 122,357 |
Noncompete Agreements [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Weighted average useful lives of acquired intangible assets | 4 years |  |
Accumulated Amortization | $ 5,579 | 4,152 |
Intangible assets, estimated future amortization [Abstract] |  |  |
Intangible Assets, Gross (Excluding Goodwill) | 8,125 | 6,652 |
Intangible Assets, Net (Excluding Goodwill) | $ 2,546 | 2,500 |
Trade Names [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Weighted average useful lives of acquired intangible assets | 4 years |  |
Accumulated Amortization | $ 1,500 | 1,500 |
Intangible assets, estimated future amortization [Abstract] |  |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 1,500 | $ 1,500 |

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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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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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