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Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets- |  |
Accounts receivable and allowance for doubtful accounts | $ 1,660 | $ 1,445
Stock-based compensation | 2,561 | 2,538
Accrued liabilities and expenses | 25,569 | 19,449
Lease liabilities | 20,873 |
Net operating loss carryforwards | 2,750 | 3,242
Intangible assets | 7,988 | 5,071
Other | 525 | 550
Subtotal | 61,926 | 32,295
Valuation allowances | (369) | (648)
Total deferred tax assets | 61,557 | 31,647
Deferred tax liabilities- |  |
Property and equipment | (11,286) | (10,488)
Lease right-of-use asset | (20,873) |
Long-term contracts | (876) | (688)
Goodwill | (6,020) | (3,864)
Other | (2,004) | (360)
Total deferred tax liabilities | (41,059) | (15,400)
Net deferred tax assets | 20,498 | 16,247
Deferred income tax assets |  |
Deferred tax assets | 21,923 | 17,634
Deferred income tax liabilities |  |
Deferred tax liabilities | $ 1,425 | $ 1,387

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