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Intangible and Other Non-Current Assets Intangible and Other Non-Current Assets (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
business
Sep. 30, 2018
USD ($)
business
Dec. 31, 2018
USD ($)
business
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Deferred Costs and Other Noncurrent Assets [Abstract]          
Tradenames     $ 17,635 $ 14,372  
Capitalized commissions on preneed contracts, net     2,717 0  
Other     25 15  
Intangible and other non-current assets     24,425 18,117  
Amortization of capitalized commissions on preneed contracts     $ 599 0 $ 0
Number Of Business Closed | business 3 3 3    
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down $ 125 $ 125      
Accumulated Amortization of Other Deferred Costs     $ 599    
Minimum          
Deferred Costs and Other Noncurrent Assets [Abstract]          
Service Contract, Term     8 years    
Maximum          
Deferred Costs and Other Noncurrent Assets [Abstract]          
Service Contract, Term     10 years    
Noncompete Agreements          
Deferred Costs and Other Noncurrent Assets [Abstract]          
Prepaid agreements not-to-compete, net of accumulated amortization of $6,051 and $6,672, respectively     $ 4,048 3,730  
Accumulated amortization     6,672 6,051  
Amortization of intangible assets     $ 620 550 435
Noncompete Agreements | Minimum          
Deferred Costs and Other Noncurrent Assets [Abstract]          
Term of agreements not to compete     1 year    
Noncompete Agreements | Maximum          
Deferred Costs and Other Noncurrent Assets [Abstract]          
Term of agreements not to compete     10 years    
Noncompete Agreements          
Deferred Costs and Other Noncurrent Assets [Abstract]          
Increase (Decrease) in Deferred Charges     $ 800 900  
Trade Names          
Deferred Costs and Other Noncurrent Assets [Abstract]          
Tradenames acquired     3,300 $ 2,700  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)     $ 0   $ 145