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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

X

- 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.

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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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

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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.

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