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Organization and Summary of Significant Accounting Policies (Income Tax) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Accounting Policies [Abstract] |  |  |
Deferred tax liabilities, undistributed foreign earnings | $ 1.8 | $ 1.8 | $ 3.1
Provisional income tax expense (benefit) |  | (7.5) |
Tax Cuts and Jobs Act of 2017, income tax expense (benefit) | $ 0.2 | 0.2 |
Change in tax rate, deferred tax asset, provisional income tax expense |  | $ 7.7 |

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