CONSOLIDATED FINANCIAL STATEMENT DETAILS - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accrued expenses and other current liabilities:
Accrued employee compensation and benefits	$ 153,705	$ 137,583
Accrued advertising expense	91,470	105,520
Other	256,828	191,783
Accrued expenses and other current liabilities	$ 502,003	$ 434,886