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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred income tax assets: |  |
Allowance for uncollectible accounts receivable | $ 467 | $ 645
Accrued compensation expense | 5,154 | 6,203
Inventory differences | 2,505 | 1,065
Net operating loss carryforwards | 15,741 | 27,742
Deferred revenue | 58 | 73
Stock-based compensation expense | 2,281 | 2,738
Federal research and development credit carryforward | 0 | 3,524
Foreign tax credits | 0 | 364
Other | 8,986 | 6,984
Total deferred income tax assets | 35,192 | 49,338
Deferred income tax liabilities: |  |
Prepaid expenses | (930) | (782)
Property and equipment | (20,352) | (25,108)
Intangible assets | (28,588) | (35,773)
Other | (1,830) | (1,480)
Total deferred income tax liabilities | (51,700) | (63,143)
Valuation allowance | (4,422) | (3,786)
Net deferred income tax liabilities | (20,930) | (17,591)
Reported as: |  |
Deferred income tax assets - Current | 0 | 8,219
Deferred income tax assets - Long-term | 2,359 | 171
Deferred income tax liabilities - Long-term | (23,289) | (25,981)
Net deferred income tax liabilities | $ (20,930) | $ (17,591)

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