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Income Taxes (Schedule Of Components Of Net Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Current [Member] |  |
Assets: |  |
Accrued expenses |  | $ 23,298
Accounts receivable reserves |  | 2,973
Deferred revenue |  | 7,392
Inventory basis differences |  | 3,292
Share-based compensation |  | 2,565
Other |  | 234
Net operating loss carryforwards |  | 65
Total assets |  | 39,819
Valuation allowance |  | (507)
Total assets, net of valuation allowance |  | 39,312
Liabilities: |  |
Other |  | (550)
Unrealized gains on foreign currency exchange contracts, interest rate swaps and investments |  | (882)
Total liabilities |  | (1,432)
Net deferred tax assets |  | 37,880
Long-Term [Member] |  |
Assets: |  |
Accrued expenses | $ 22,145 | 5,329
Accounts receivable reserves | 2,715 |
Deferred revenue | 13,400 | 3,656
Inventory basis differences | 3,959 | 293
Property-based differences | 1,382 | 1,524
Share-based compensation | 13,021 | 10,580
Other | 678 | 361
Net operating loss carryforwards | 4,182 | 4,059
Unrealized losses on foreign currency exchange contracts, interest rate swaps and investments | 148 | 53
Total assets | 61,630 | 25,855
Valuation allowance | (4,891) | (3,939)
Total assets, net of valuation allowance | 56,739 | 21,916
Liabilities: |  |
Accrued expenses | (143) |
Accounts receivable reserves | (85) |
Deferred revenue | (36) |
Deferred instrument costs | (24,142) | (16,090)
Property-based differences | (43,159) | (35,079)
Intangible assst basis differences | (17,672) | (17,109)
Other | (507) | (1,460)
Unrealized gains on foreign currency exchange contracts, interest rate swaps and investments | (4,575) |
Total liabilities | (90,319) | (69,738)
Net deferred tax (liabilities) | $ (33,580) | $ (47,822)

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