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Income Taxes - Significant Components of Federal and State Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Allowance for doubtful accounts | $ 14,599 | $ 3,109
Deferred compensation | 7,350 | 6,601
Accrued insurance claims | 3,715 | 3,665
Non-deductible reserves | 336 | 567
Amortization of intangibles | 24 | 162
Other | 1,730 | 662
Deferred tax assets | 27,754 | 14,766
Deferred tax liabilities: |  |
Expensing of housekeeping supplies | (4,375) | (4,678)
Depreciation of property and equipment | (1,913) | (1,745)
Other | (914) | (845)
Deferred tax liabilities | (7,202) | (7,268)
Net deferred tax assets | $ 20,552 | $ 7,498

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