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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred Tax Assets and Liabilities [Line Items] |  |
Net operating loss carryforwards | $ 113,327 | $ 102,710
Inventory adjustments | 42,376 | 56,890
Allowance for doubtful accounts | 12,368 | 14,526
Accrued expenses | 28,229 | 40,179
Interest carryforward | 15,964 | 19,073
Stock-based compensation awards | 12,982 | 24,505
Other comprehensive income items | 0 | 10,859
Deferred Tax Assets, Tax Deferred Expense, Integration and Restructuring | 6,726 | 2,970
Other | 17,015 | 17,830
Deferred Tax Assets, Gross | 248,987 | 289,542
Valuation Allowance | (13,915) | (15,323)
Total deferred tax assets | 235,072 | 274,219
Goodwill | (109,994) | (142,541)
Depreciation | (116,725) | (94,838)
Intangible Assets | (18,760) | (21,118)
Deferred Tax Liabilities, Deferred Expense, Capitalized Software | 0 | 0
Deferred Tax Liabilities, Other Comprehensive Income | (5,542) | 0
Deferred Tax Liabilities, Gross | (251,021) | (258,497)
Total deferred tax liabilities | $ (15,949) |
Total net deferred tax assets (liabilities) |  | $ 15,722

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- Definition The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from other comprehensive income items, which can only be deducted for tax purposes when actual costs are incurred, and which can only be relaized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken. + References No definition available. + Details
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- Definition The cumulative amount of the estimated future tax effects attributable to the difference between the tax basis of tax-deductible depreciation and the basis of depreciation computed in accordance with generally accepted accounting principles. The difference in the basis will increase future taxable income when such difference reverses. + References No definition available. + Details
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