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Derivative Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Fair Value of Derivatives The fair value amounts in the consolidated balance sheets were:
Notional Amounts1
Other Assets Other Current Liabilities 
September 30, December 31, September 30, December 31, September 30, December 31, 
201820172018201720182017
Derivative designated as a cash flow hedge: 
Interest rate swap $21,078 $21,969 $13 $16 $— $— 
  (1) Notional amounts represent the gross contract/notional amount of the derivatives outstanding.
Derivative Gains (Losses) In The Consolidated Statements Of Income Related To Interest Rate Swap Contracts
Gains associated with derivative instruments not designated as hedging instruments are as follows:
Three Months Ended September 30, Nine Months Ended September 30, 
Classification 2018201720182017
Gain (loss) recognized in income Gain (loss) on foreign exchange $1,169 $— $(19)$— 

The following table reflects the effect of the interest rate swap contract designated as a cash flow hedging instrument in the Company's financial statements:
Three Months Ended September 30, Nine Months Ended September 30, 
2018201720182017
Effective portion recognized in other comprehensive income, pretax: 
Interest rate swap $(5)$(7)$(3)$(47)