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Income Taxes (Schedule of Components of Net Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Accrued expenses | $ 25,296 | $ 22,652
Accounts receivable reserves | 617 | 776
Deferred revenue | 6,073 | 7,637
Inventory basis differences | 3,315 | 2,787
Property-based differences | 3,113 | 1,652
Share-based compensation | 10,593 | 9,267
Other | 1,160 | 2,314
Net operating loss carryforwards | 4,045 | 3,208
Tax credit carryforwards | 12,276 | 10,226
Unrealized losses on foreign currency exchange contracts and investments | 20 | 404
Total assets | 66,508 | 60,923
Valuation allowance | (9,454) | (6,212)
Total assets, net of valuation allowance | 57,054 | 54,711
Liabilities |  |
Customer acquisition costs | (28,519) | (24,323)
Property-based differences | (33,802) | (32,494)
Intangible asset basis differences | (14,513) | (13,454)
Other | (3,961) | (3,319)
Unrealized gains on foreign currency exchange contracts and investments | (1,183) | (1,907)
Total liabilities | (81,978) | (75,497)
Net deferred tax assets (liabilities) | $ (24,924) | $ (20,786)

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