9. Foreign currency exchange contracts and hedging

As of June 30, 2018 and June 30, 2017, the Company’s total non-designated and designated derivative contracts had notional amounts totaling approximately $3,072 and $12,477, respectively, and $2,529 and $8,644, 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 $543, net of tax, during the six months ended June 30, 2018, and an unrealized loss of approximately $254, net of tax, during the six months ended June 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 six months ended June 30, 2018 and June 30, 2017, the ineffective portion relating to these hedges was immaterial and the hedges remained effective through their respective settlement dates. As of June 30, 2018, the Company had twenty-one designated hedges and four non-designated hedges. As of June 30, 2017, the Company had thirteen designated hedges and four non-designated hedges.