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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 |  |

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