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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Loss Contingencies [Line Items]      
Rent expense $ 6,100 $ 6,100 $ 6,500
Assets aquired under capital leases 6,600 2,700  
Agreements, Future Payments, Due in One Year 4,672    
Agreements, Future Payments, Due in Two Years 3,156    
Agreements, Future Payments, Due in Three Years 2,745    
Agreements, Future Payments, Due in Four Years 1,789    
Agreements, Future Payments, Due in Five Years 955    
Agreements, Future Payments, Due Thereafter 1,360    
Matching contributions and plan administrative expenses 1,900 1,800 1,700
Cemetery business and accounting services expense   900 1,900
Cemetery Business And Accounting Services Expense Paid   $ 600 $ 1,000
Noncompete Agreements      
Loss Contingencies [Line Items]      
Agreements, Future Payments, Due in One Year 1,745    
Agreements, Future Payments, Due in Two Years 1,564    
Agreements, Future Payments, Due in Three Years 1,324    
Agreements, Future Payments, Due in Four Years 1,217    
Agreements, Future Payments, Due in Five Years 837    
Agreements, Future Payments, Due Thereafter 1,360    
Consulting Agreement      
Loss Contingencies [Line Items]      
Agreements, Future Payments, Due in One Year 907    
Agreements, Future Payments, Due in Two Years 592    
Agreements, Future Payments, Due in Three Years 421    
Agreements, Future Payments, Due in Four Years 328    
Agreements, Future Payments, Due in Five Years 118    
Agreements, Future Payments, Due Thereafter 0    
Employment Agreement      
Loss Contingencies [Line Items]      
Agreements, Future Payments, Due in One Year 2,020    
Agreements, Future Payments, Due in Two Years 1,000    
Agreements, Future Payments, Due in Three Years 1,000    
Agreements, Future Payments, Due in Four Years 244    
Agreements, Future Payments, Due in Five Years 0    
Agreements, Future Payments, Due Thereafter $ 0    
Minimum      
Loss Contingencies [Line Items]      
Agreements, Term of Contract 1 year    
Minimum | Noncompete Agreements      
Loss Contingencies [Line Items]      
Agreements, Term of Contract 1 year    
Minimum | Consulting Agreement      
Loss Contingencies [Line Items]      
Agreements, Term of Contract 1 year    
Minimum | Employment Agreement      
Loss Contingencies [Line Items]      
Agreements, Term of Contract 3 years    
Maximum      
Loss Contingencies [Line Items]      
Agreements, Term of Contract 12 years    
Maximum | Noncompete Agreements      
Loss Contingencies [Line Items]      
Agreements, Term of Contract 10 years    
Maximum | Consulting Agreement      
Loss Contingencies [Line Items]      
Agreements, Term of Contract 10 years    
Maximum | Employment Agreement      
Loss Contingencies [Line Items]      
Agreements, Term of Contract 4 years