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Debt - Additional Information (Details)
12 Months Ended
Dec. 31, 2007
USD ($)
Jun. 30, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]      
Debt default, number of loans | loan   2  
Debt default, amount   $ 38,942,000  
Mortgages and Notes Payable      
Debt Instrument [Line Items]      
Weighted average interest rate   4.60% 4.50%
Mortgages payable   $ 436,642,000 $ 575,514,000
6.804% Trust Preferred Securities      
Debt Instrument [Line Items]      
Stated interest rate 6.804%    
Face amount of debt instrument $ 200,000,000    
Interest rate, effective percentage   4.283%  
Principal amount outstanding   $ 129,120,000 129,120,000
Unamortized debt issuance costs   $ 1,774,000 $ 1,824,000
6.804% Trust Preferred Securities | London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.70%    
Richland, Washington | Mortgages      
Debt Instrument [Line Items]      
Stated interest rate   4.00%  
Mortgages payable   $ 110,000,000  
Minimum | Mortgages and Notes Payable      
Debt Instrument [Line Items]      
Stated interest rate   2.20%  
Maximum | Mortgages and Notes Payable      
Debt Instrument [Line Items]      
Stated interest rate   6.50%