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Income Taxes - Deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of tax effects of principal temporary differences that give rise to deferred tax assets
Stock-based compensation	$ 19,834	$ 15,024
Allowance for doubtful accounts	7,943	3,250
Contract liabilities	6,107	5,445
Capital loss carryforward	4,174
Other	3,650	1,217
Other facility-related costs	2,080	2,622
Deferred leasing costs	1,673	1,789
Intangible assets	(82,022)	(1,196)
Property and equipment	(18,441)	(3,326)
Valuation allowance	(4,356)
Prepaid compensation		(373)
Net deferred tax asset		$ 24,452
Net deferred tax liability	$ (59,358)

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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.

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