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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Mortgage note receivable     $ 10,600
Notes receivable $ 24,119 $ 24,110  
Interest rate swap asset 215 902  
Carrying Value [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Notes receivable 24,119 24,110  
Mortgage note payable 5,365 5,391  
Carrying Value [Member] | Interest Rate Swap [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate swap asset 215 902  
Interest rate swap liability 857 269  
Fair Value [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Notes receivable 23,948 23,936  
Mortgage note payable 5,277 5,307  
Fair Value [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate swap asset 215 902  
Interest rate swap liability $ 857 $ 269