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Goodwill and Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 469,476 |  | $ 469,476 |  | $ 469,072
Amortization expense | 2,100 | $ 1,800 | $ 4,300 | $ 3,500 |
Weighted average remaining useful lives of identifiable intangible assets |  |  |  | 9 years 6 months |
Minimum [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Intangible assets, estimated useful lives |  |  | 1 year |  |
Minimum [Member] | Customer and Referral Relationships [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Intangible assets, estimated useful lives |  |  | 5 years |  |
Maximum [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Intangible assets, estimated useful lives |  |  | 25 years |  |
Maximum [Member] | Customer and Referral Relationships [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Intangible assets, estimated useful lives |  |  | 10 years |  |
General and Administrative Expense [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 469,500 |  | $ 469,500 |  | $ 469,100

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- Definition Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 926 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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