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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

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