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Organization and Summary of Significant Accounting Policies - Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Dec. 31, 2018
segment
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
segment
Jun. 30, 2018
USD ($)
Accounting Principle [Line Items]          
Number of Reportable Segments   2   1  
Number of Operating Segments   2   1  
Total revenues | $ $ 217,413   $ 188,673 $ 419,930 $ 371,292
Lease Receivable | Customer Concentration Risk          
Accounting Principle [Line Items]          
Concentration risk percentage       50.00%