Acquisitions Purchase Accounting (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2020	Jan. 03, 2020	Dec. 31, 2019	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 394,483		$ 398,292	$ 303,887
Lafayette, California [Member]
Business Acquisition [Line Items]
Current assets	2,555	$ 2,662
Deferred revenue	541	541
Preneed trust liabilities	(9,089)	(9,089)
Deferred tax liability	(530)	(527)
Assumed liabilities	(489)	(489)
Intangible and other non-current assets	1,878	2,506
Goodwill	13,572	12,916
Cemetery property	14,835	14,753
Property, plant & equipment	1,720	1,720
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Preneed Trust Assets	9,089	9,089
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net After Adjustment	33,000
Current Assets, Purchase Accounting Adjustments	(107)
Goodwill, Purchase Accounting Adjustments	656
Intangible Assets And Other Non-Current Assets, Purchase Accounting Adjustments	(628)
Cemetery Property Purchase Account Adjustments	82
Purchase price		$ 33,000
Fairfax, Virginia
Business Acquisition [Line Items]
Current assets	1,686		1,482
Deferred revenue	641		1,633
Deferred tax liability	(15,463)		(15,463)
Assumed liabilities	(802)		(657)
Intangible and other non-current assets	6,789		8,269
Goodwill	99,982		99,344
Cemetery property	11,949		11,994
Property, plant & equipment	21,680		21,680
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Preneed Trust Assets	15,891		15,891
Deferred Revenue, Purchase Accounting Adjustments	992
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net After Adjustment	141,071
Assumed Liabilities, Purchase Accounting Adjustments	(145)
Current Assets, Purchase Accounting Adjustments	204
Goodwill, Purchase Accounting Adjustments	638
Intangible Assets And Other Non-Current Assets, Purchase Accounting Adjustments	(1,480)
Cemetery Property Purchase Account Adjustments	$ (45)
Purchase price			$ 140,907