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Organization and Summary of Significant Accounting Policies (Recent Accounting Pronouncements) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Restricted cash $ 64,051   $ 64,051   $ 22,298
Excess tax benefit from stock-based compensation       $ (189)  
Retained earnings 214,438   214,438   196,002
Income Tax Expense (Benefit) 2,960 $ 2,517 13,367 7,987  
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 64,100 $ 22,300 64,100 22,300  
Increase to net cash flows from operating activities       3,400  
Increase Decrease In Cash Flows From Investing Activities       100  
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)     $ 60