9. Foreign currency exchange contracts and hedging

As of September 30, 2018 and September 30, 2017, the Company’s total non-designated and designated derivative contracts had notional amounts totaling approximately $4,105 and $27,310, respectively, and $2,251 and $11,117, respectively. These contracts were comprised of offsetting contracts with the same counterparty, each expires within one to six months, and had an unrealized gain of approximately $291, net of tax, during the nine months ended September 30, 2018, and an unrealized loss of approximately $145, net of tax, during the nine months ended September 30, 2017.

The nonperformance risk of the Company and the counterparty did not have a material impact on the fair value of the derivatives. During the nine months ended September 30, 2018 and September 30, 2017, there were no ineffective portions relating to these hedges and the hedges remained effective through their respective settlement dates. As of September 30, 2018, the Company had thirty-nine designated hedges and seven non-designated hedges. As of September 30, 2017, the Company had fifteen designated hedges and three non-designated hedges.