Organization and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Cash and cash equivalents	$ 117,702	$ 74,120
Restricted cash	43,987	24,769
Total cash, cash equivalents, and restricted cash shown on consolidated statement of cash flows	$ 161,689	$ 98,889	$ 158,091	$ 85,125