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Income Taxes (Schedule of Components of Net Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Assets |  |  |  |
Accrued expenses | $ 46,830 | $ 25,296 |  |
Accounts receivable reserves | 2,505 | 617 |  |
Deferred revenue | 7,629 | 6,073 |  |
Inventory basis differences | 4,272 | 3,315 |  |
Property-based differences | 14,865 | 3,113 |  |
Intangible asset basis differences | 51,319 | 0 |  |
Share-based compensation | 10,011 | 10,593 |  |
Other | 1,484 | 1,160 |  |
Net operating loss carryforwards | 5,427 | 4,045 |  |
Tax credit carryforwards | 13,385 | 12,276 |  |
Unrealized losses on foreign currency exchange contracts and investments | 5,060 | 20 |  |
Total assets | 162,787 | 66,508 |  |
Valuation allowance | (40,262) | (9,454) | $ (6,212) | $ (6,211)
Total assets, net of valuation allowance | 122,525 | 57,054 |  |
Liabilities |  |  |  |
Customer acquisition costs | (34,449) | (28,519) |  |
Property-based differences | (49,547) | (33,802) |  |
Intangible asset basis differences | (16,134) | (14,513) |  |
Other | (2,241) | (3,961) |  |
Unrealized gains on foreign currency exchange contracts and investments | (312) | (1,183) |  |
Total liabilities | (102,683) | (81,978) |  |
Net deferred tax assets (liabilities) | $ 19,842 |  |  |
Net deferred tax assets (liabilities) |  | $ (24,924) |  |

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