should not be considered as a substitute for, nor superior to, GAAP measures. Quantitative and qualitative disclosures about market risk Equity price risk At December 31. 2014 and September 30. 2015, we have one investment in an equity security of a publicly traded company. This available-for-sale marketable equity security is reported at fair value based on its quoted market price with any unrealized gain or loss, net of tax, included as a component of "Accumulated other comprehensive loss" in the accompanying combined balance sheet. Investments in equity securities of publicly traded companies are exposed to significant fluctuations in fair value due to the volatility of the stock market. During 2013 and 2014 and for the nine months ended September 30. 2015, we did not record any other-than-temporary impairment charges related to this available-for-sale marketable equity security. During 2012, we recorded an S8.7 million other-than-temporary impairment charge related to this available-for-sale marketable equity security. The other-than-temporary impairment charge is included in "Other (expense) income, net" in the accompanying combined statement of operations. Foreign currency exchange risk We conduct business in certain foreign markets, primarily in the European Union. For the nine months ended September 30. 2015. international revenue accounted for 31% of combined revenue. Our primary exposure to foreign currency exchange risk relates to investments in foreign subsidiaries that transact business in a functional currency other than the U.S. Dollar, primarily the Euro. As foreign currency exchange rates change. translation of the statements of operations of our international businesses into U.S. dollars affects year-over-year comparability of operating results. The average Euro versus the U.S. Dollar exchange rate was 18% lower in the first nine months of 2015 than 2014. The decrease had a significant impact to revenue. Total revenue, Dating revenue