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Basis of Presentation and Summary of Significant Accounting Policies (Operations) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) cemeteries states funeral_homes | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) segment divestiture states cemeteries funeral_homes | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) divestiture
Organization Description and Operations [Line Items] |  |  |  |  |
Depreciation expense | $ 3,400 | $ 3,500 | $ 10,200 | $ 10,800 |
Number of business segments | segment |  |  | 2 |  |
Amortization Of Cemetery Property | $ 1,500 |  | $ 5,200 | 3,400 |
The percentage of trust assets in custody of institution receiving trust management services | 80.00% |  | 80.00% |  |
Income Tax Expense (Benefit), Net Of Uncertain Tax Positions | $ (5,122) | $ (2,859) | $ (6,571) | $ (4,158) |
Income taxes before discrete items | (28.20%) | (34.00%) | (28.30%) | (33.80%) |
Accumulated Amortization, Property, Plant, and Equipment | $ (51,800) |  | $ (51,800) |  | $ (46,600)
Option to renew lease | 26 years |  | 26 years |  |
Property, plant and equipment, gross | $ 100,500 |  | $ 100,500 |  | $ 101,100
Property, Plant and Equipment, Disposals | 2,400 |  |  |  |
Property, Plant and Equipment, Additions | (6,500) | $ (4,200) | (15,300) | $ (10,000) |
Total benefit for income taxes | 5,122 | $ 2,859 | 6,571 | $ 4,158 |
Proceeds from sale of property |  |  | 700 |  |
Loss on sale of property |  |  | 300 |  |
Discontinued Operations, Held-for-sale |  |  |  |  |
Organization Description and Operations [Line Items] |  |  |  |  |
Loss on sale of property |  |  | 500 |  |
Carrying value of property, plant and equipment assets-held-for-sale | $ 2,300 |  | $ 2,300 |  |
Funeral And Cemetery [Member] |  |  |  |  |
Organization Description and Operations [Line Items] |  |  |  |  |
Threshold period past due in which statements are sent |  |  | 30 days |  |
Threshold period past due in which past due notification letters are sent |  |  | 45 days |  |
Cemetery |  |  |  |  |
Organization Description and Operations [Line Items] |  |  |  |  |
Threshold period past due in which past due notification letters are sent |  |  | 15 days |  |
Funeral homes [Member] |  |  |  |  |
Organization Description and Operations [Line Items] |  |  |  |  |
Number of owned and operated funeral homes (in Funeral Homes) | funeral_homes | 171 |  | 171 |  |
Number of states in which Company operates | states | 26 |  | 26 |  |
Revenue, Percentage | 70.00% |  | 70.00% |  |
Cemeteries [Member] |  |  |  |  |
Organization Description and Operations [Line Items] |  |  |  |  |
Number of states in which Company operates | states | 12 |  | 12 |  |
Number of owned and operated cemeteries (in Cemetaries) | cemeteries | 32 |  | 32 |  |
Revenue, Percentage | 30.00% |  | 30.00% |  |
Funeral |  |  |  |  |
Organization Description and Operations [Line Items] |  |  |  |  |
Number of Businesses Sold | divestiture |  |  | 3 |  | 6
Minimum [Member] |  |  |  |  |
Organization Description and Operations [Line Items] |  |  |  |  |
Service Contract, Term |  |  | 8 years |  |
Lessee, Operating Lease, Term of Contract | 1 year |  | 1 year |  |
Lessee, Finance Lease, Term of Contract | 10 years |  | 10 years |  |
Maximum [Member] |  |  |  |  |
Organization Description and Operations [Line Items] |  |  |  |  |
Service Contract, Term |  |  | 10 years |  |
Lessee, Operating Lease, Term of Contract | 19 years |  | 19 years |  |
Lessee, Finance Lease, Term of Contract | 40 years |  | 40 years |  |

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