Organization and Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash flows from investing activities	$ (177,736)	$ (80,910)
Net increase in cash, cash equivalents and restricted cash	$ 3,627	8,116
Accounting Standards Update 2016-18 | Restatement Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash flows from investing activities		9,700
Accounting Standards Update 2016-18 | Scenario, Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net decrease in cash and cash equivalents		$ 1,600