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Shareholders' Equity - Components Of Accumulated OCI (Details) - USD ($) $ in Thousands | Jan. 01, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Cumulative foreign currency translation adjustment |  | $ (66,966) | $ (62,689)
Net unrealized loss on hedges, net of tax |  | (4,350) | (7,507)
Unrealized gain on note receivable, net of tax |  | 0 | 409
Accumulated other comprehensive loss |  | (71,316) | (69,787)
Deferred tax assets |  | $ 1,100 | 4,000
Deferred tax liabilities |  |  | $ 200
Retained Earnings | ASU No. 2018-02 |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification of stranded tax benefits (losses) | $ 1,500 |  |
Accumulated OCI | ASU No. 2018-02 |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification of stranded tax benefits (losses) | (1,500) |  |
Hedges | Retained Earnings | ASU No. 2018-02 |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification of stranded tax benefits (losses) | 1,600 |  |
Hedges | Accumulated OCI | ASU No. 2018-02 |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification of stranded tax benefits (losses) | (1,600) |  |
Note Receivable | Retained Earnings | ASU No. 2018-02 |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification of stranded tax benefits (losses) | (100) |  |
Note Receivable | Accumulated OCI | ASU No. 2018-02 |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification of stranded tax benefits (losses) | $ 100 |  |

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- Definition Amount of reasonable estimate for income tax benefit (loss) from effect of U.S. Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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