Organization and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Cash and cash equivalents	$ 147,243	$ 62,582
Restricted cash	59,150	71,648
Total cash, cash equivalents, and restricted cash shown on consolidated statement of cash flows	$ 206,393	$ 134,230	$ 111,350	$ 88,704