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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019 | Jan. 01, 2018
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Restricted cash | $ 0 | $ 0 |  |  |
Capitalized costs | 0 | 0 | $ 0 |  |
Advertising costs | 1,800,000 | 1,700,000 | 2,100,000 |  |
Foreign currency gains (losses) | $ (3,100,000) | $ 1,100,000 | $ (1,300,000) |  |
Accounting Standards Update 2016-16 |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Reduction to other long-term assets resulting from cumulative effect |  |  |  |  | $ 7,700,000
Scenario, Forecast | Accounting Standards Update 2016-02 |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Operating lease, right-of-use asset |  |  |  | $ 85,000,000 |
Operating lease liability |  |  |  | $ 86,000,000 |

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