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8. Derivatives and Other Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Gross Fair Market Value of Derivative Instruments
Liability Derivatives
Derivative Instrument   Location   March 31, 2017   December 31, 2016
Foreign Currency
Exchange Contracts
  Accrued Expenses $ $