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Debt - Mortgage Loans and Promissory Note and Off-Balance Sheet Arrangements (Details)
$ in Thousands
1 Months Ended 9 Months Ended
Dec. 31, 2017
USD ($)
facility
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]      
Long-term debt, gross   $ 278,510 $ 246,080
Amount outstanding, current   $ 10,177 10,105
Mortgage loans and promissory note | Mortgages      
Debt Instrument [Line Items]      
Number of operating subsidiaries | facility 17    
Notes payable $ 112,000    
Prepayment penalty reduced rate during first three years 10.00%    
Prepayment penalty reduced rate during the fourth year 3.00%    
Prepayment penalty reduced rate for the fifth through tenth years 1.00%    
Prepayment penalty reduced rate   1.00%  
Mortgage loans and promissory note | Mortgages | Minimum      
Debt Instrument [Line Items]      
Debt instrument, pre-payment fee reduction, term 5 years 3 years  
Debt instrument, term 30 years 12 years  
Mortgage loans and promissory note | Mortgages | Maximum      
Debt Instrument [Line Items]      
Debt instrument, pre-payment fee reduction, term 10 years 11 years  
Debt instrument, term 35 years 33 years  
Mortgage loans and promissory note | Notes Payable to Banks      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage 3.30%    
Mortgage loans and promissory note | Notes Payable to Banks | Minimum      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage   2.60%  
Mortgage loans and promissory note | Notes Payable to Banks | Maximum      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage   5.30%  
Mortgage loans and promissory note | Notes Payable Other Payables      
Debt Instrument [Line Items]      
Long-term debt, gross   $ 121,010 $ 122,955
Amount outstanding, current   2,677  
Long-term debt—less current maturities   118,333  
Secured Debt | Senior Debt Obligations      
Debt Instrument [Line Items]      
Pledged financial instruments, not separately reported, securities for letter of credit facilities   $ 5,342