Goodwill and Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Goodwill [Line Items]
Goodwill	$ 469,036		$ 469,072
Amortization expense	$ 2,200	$ 1,800
Weighted average remaining useful lives of identifiable intangible assets	9 years 7 months 6 days
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