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Income Taxes - Deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Schedule of tax effects of principal temporary differences that give rise to deferred tax assets |  |
Right-of-use lease assets | $ (21,673) | $ 0
Allowance for doubtful accounts | 8,884 | 7,943
Contract liabilities | 8,139 | 6,107
Stock-based compensation | 6,322 | 19,834
Capital loss carryforward | 4,459 | 4,174
Other | 1,955 | 3,650
Other facility-related costs | 489 | 2,080
Intangible assets | (65,777) | (82,022)
Deferred leasing costs | 27,074 | 1,673
Property and equipment | (13,120) | (18,441)
Valuation allowance | (4,694) | (4,356)
Net deferred tax asset (liability) | $ (47,942) | $ (59,358)

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- Definition The tax effect as of the balance sheet date of the amount of estimated future tax effect attributable to the difference between the tax basis of the deferred gain on sale of property and the basis of the deferred gain on sale of property in accordance with generally accepted accounting principles. + References No definition available. + Details
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