Organization and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Cash and cash equivalents	$ 41,781	$ 34,598
Restricted cash	97,154	54,106
Total cash, cash equivalents, and restricted cash shown on consolidated statement of cash flows	$ 138,935	$ 88,704	$ 113,585	$ 87,200