Organization and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Cash and cash equivalents	$ 34,598	$ 40,867
Restricted cash	54,106	46,333
Total cash, cash equivalents, and restricted cash shown on consolidated statement of cash flows	$ 88,704	$ 87,200	$ 98,889	$ 85,125