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Related Party Transactions - Narrative (Details)
$ in Thousands
1 Months Ended 2 Months Ended 12 Months Ended
Jan. 31, 2018
USD ($)
Nov. 30, 2004
USD ($)
Property
Dec. 31, 2018
USD ($)
lease
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2002
USD ($)
Property
Related Party Transaction [Line Items]            
Lease term (in years)     15 years      
Proceeds from disposition of business, net of cash acquired     $ 942 $ 1,141 $ 35,899  
Related Party            
Related Party Transaction [Line Items]            
Number of operating leases | lease     5      
Properties sold | Property   11       10
Borrowings collateralized by the land and buildings   $ 6,800       $ 5,000
Lease term (in years)   15 years        
Aggregate annual rental $ 300 $ 200        
Minimum | Related Party            
Related Party Transaction [Line Items]            
Lease term (in years) 5 years          
Maximum | Related Party            
Related Party Transaction [Line Items]            
Lease term (in years) 8 years