Derivative Instruments	12 Months Ended
Dec. 31, 2017
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Instruments	3. Derivative Instruments The Company is exposed to certain risks relating to its ongoing business operations. The primary risk managed by the use of derivative instruments is foreign currency exchange risk. The Company holds forward foreign currency exchange contracts that are not designated as any type of accounting hedge as defined by U.S. generally accepted accounting principles. The Company uses these contracts to manage its exposure to exchange rate fluctuations on certain Company subsidiary cash, accounts receivable, accounts payable and other obligation balances that are denominated in currencies other than the entities’ functional currencies. The forward foreign exchange contracts are recognized on the balance sheet as either an asset or a liability measured at fair value. Gains and losses arising from recording the foreign exchange contracts at fair value are reported in earnings as offsets to the losses and gains reported in earnings arising from the re-measurement of the receivable and payable balances into the applicable functional currencies. At December 31, 2017 and 2016, the Company had open forward foreign currency exchange contracts, all with durations of one to three months, to buy or sell foreign currencies with a U.S. dollar equivalent of $41,196,629 and $33,372,000 , respectively. The Company held no interest rate contracts at December 31, 2017 or December 31, 2016. The Company held an interest rate swap contract with a notional value of $ $3,724,000 at December 31, 2015. In the fourth quarter of 2016, the underlying loan that was hedged with the interest rate swap contract was paid in full, and the contract was terminated. The loss realized from the termination of the interest rate swap was immaterial. The fair values of the derivative instruments held by the Company on December 31, 2017, and December 31, 2016, are disclosed in Note 2. Derivative instrument gains and losses for the years ended December 31, 2017, 2016 and 2015, were immaterial. For amounts reclassified out of AOCI into earnings for the years ended December 31, 2017, 2016 and 2015, see Note 19.

3. Derivative Instruments

The Company is exposed to certain risks relating to its ongoing business operations. The primary risk managed by the use of derivative instruments is foreign currency exchange risk. The Company holds forward foreign currency exchange contracts that are not designated as any type of accounting hedge as defined by U.S. generally accepted accounting principles. The Company uses these contracts to manage its exposure to exchange rate fluctuations on certain Company subsidiary cash, accounts receivable, accounts payable and other obligation balances that are denominated in currencies other than the entities’ functional currencies. The forward foreign exchange contracts are recognized on the balance sheet as either an asset or a liability measured at fair value. Gains and losses arising from recording the foreign exchange contracts at fair value are reported in earnings as offsets to the losses and gains reported in earnings arising from the re-measurement of the receivable and payable balances into the applicable functional currencies. At December 31, 2017 and 2016, the Company had open forward foreign currency exchange contracts, all with durations of one to three months, to buy or sell foreign currencies with a U.S. dollar equivalent of $41,196,629 and $33,372,000 , respectively.

The Company held no interest rate contracts at December 31, 2017 or December 31, 2016. The Company held an interest rate swap contract with a notional value of $ $3,724,000 at December 31, 2015. In the fourth quarter of 2016, the underlying loan that was hedged with the interest rate swap contract was paid in full, and the contract was terminated. The loss realized from the termination of the interest rate swap was immaterial.

The fair values of the derivative instruments held by the Company on December 31, 2017, and December 31, 2016, are disclosed in Note 2. Derivative instrument gains and losses for the years ended December 31, 2017, 2016 and 2015, were immaterial. For amounts reclassified out of AOCI into earnings for the years ended December 31, 2017, 2016 and 2015, see Note 19.