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Income Taxes (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax liabilities: |  |
Property and equipment | $ 4,333 | $ 6,858
Intangible assets | 17,640 | 24,987
Prepaid expenses | 317 | 619
Total deferred tax liabilities | 22,290 | 32,464
Deferred tax assets: |  |
Allowance for doubtful accounts | 116 | 224
Compensation | 1,058 | 2,421
Other accrued liabilities | 44 | 78
Deferred Tax Assets, Gross, Total | 1,218 | 2,723
Less: valuation allowance | 0 | 0
Total net deferred tax assets | 1,218 | 2,723
Net deferred tax liabilities | 21,072 | 29,741
Current portion of deferred tax assets | 300 | 1,022
Non-current portion of deferred tax liabilities | (21,072) | (29,741)
Net deferred tax liabilities | $ (21,072) | $ (29,741)

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