Organization and Summary of Significant Accounting Policies (Recent Accounting Pronouncements) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash	$ 22,298		$ 40,272
Retained earnings	194,729		256,301
Accounting Standards Update 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash	64,100	$ 22,300
Increase to net cash flows from operating activities	10,700	9,600
Increase Decrease In Cash Flows From Investing Activities	1,300	16,800
Increase Decrease In Cash Flows From Financing Activities	1,300	25,400
Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase to net cash flows from operating activities	200	0
Increase Decrease In Cash Flows From Financing Activities	$ 200	$ 0
Retained earnings			$ 1,300