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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Restricted cash | $ 0 | $ 0 | $ 0 |
Capitalized costs | 0 | 0 | 0 |
Advertising costs | 1,500,000 | 1,800,000 | 1,700,000 |
Foreign currency gains (losses) | (1,100,000) | (3,100,000) | $ 1,100,000 |
Operating lease liability | 82,753,000 |  |  |
Operating lease right-of-use asset | 80,607,000 | 0 |  | $ 83,707,000
Other current assets | 124,982,000 | 108,220,000 |  | 107,228,000
Straight-line lease liabilities | 81,164,000 | $ 84,826,000 |  |
Stranded tax effects |  |  |  | 1,700,000
Accounting Standards Update 2016-02 |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Operating lease liability |  |  |  | 86,700,000
Operating lease right-of-use asset |  |  |  | 83,707,000
Other current assets | 1,000,000.0 |  |  | $ (992,000)
Straight-line lease liabilities | $ 4,000,000.0 |  |  |

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