Organization and Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash flows from investing activities	$ (98,690)	$ (97,125)
Net increase in cash, cash equivalents and restricted cash	$ 300	13,683
Accounting Standards Update 2016-18 | Restatement Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash flows from investing activities		20,200
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		$ 6,600