We conduct business on a global basis in multiple foreign currencies, subjecting us to foreign currency risk. In order to manage certain exposures to currency fluctuations, we initiated a limited hedging program during the year ended December 31, 2018 by entering into foreign currency derivative contracts with maturities of 12 months or less to hedge a portion of our net outstanding monetary assets and liabilities.

As of December 31, 2019 and 2018, we had foreign currency forward contracts with total notional values of $358.0 million and $872.8 million, respectively, which are not designated as hedge instruments. Our foreign currency contracts are classified within Level 2 because the valuation inputs are based on quoted prices and market observable data of similar instruments in active markets, such as currency spot and forward rates. The fair values of these outstanding derivative contracts were as follows (in thousands):



	Consolidated Balance Sheet Location	December 31, 2019		December 31, 2018
Derivative Assets:
Foreign currency derivative contracts	Prepaid expenses and other current assets	$	2,237	$	22,831
Derivative Liabilities
Foreign currency derivative contracts	Accrued expenses and other current liabilities	$	1,362	$	2,441