Organization and Summary of Significant Accounting Policies (Recent Accounting Pronouncements) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash	$ 43,244		$ 43,244		$ 22,298
Excess tax benefit from stock-based compensation				$ (254)
Retained earnings	209,497		209,497		194,729
Income Tax Expense (Benefit)	4,168	$ 2,418	10,406	5,470
ASU cumulative adjustment to retained earnings					$ 1,273
Accounting Standards Update 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash	43,200	$ 22,300	43,200	22,300
Increase to net cash flows from operating activities				(5,800)
Increase Decrease In Cash Flows From Investing Activities				1,300
Increase Decrease In Cash Flows From Financing Activities				(1,300)
Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase to net cash flows from operating activities				200
Increase Decrease In Cash Flows From Financing Activities				$ (200)
Retained earnings	$ 1,300		1,300
Income Tax Expense (Benefit)			$ 54