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Related Party Transactions	9 Months Ended
Related Party Transactions	Sep. 30, 2017
Related Party Transactions [Abstract]
Related Party Transactions	NOTE P – RELATED PARTY TRANSACTIONS On January 3, 2017, the Company purchased 1,834 shares of the Company from Officers at a price per share of $58.58, which was calculated from a 30-day average of market price in connection with the vesting of equity awards. The Audit Committee of the Board of Directors approved this transaction. On May 9, 2017, the Company purchased 2,500 shares of the Company from an Officer at a price per share of $52.05, which was calculated from a 30-day average of market price in connection with the vesting of equity awards. The Audit Committee of the Board of Directors approved this transaction. On August 16, 2017, the Company purchased 24,920 shares of the Company from a trust for the benefit of the Company’s Director Emeritus for the Company’s Board of Directors at a price per share of $50.16, which was calculated from a 30-day average of market price. The purchase was consummated pursuant to Share Purchase Agreements both dated August 16, 2017, between the Company and the foundation. The Audit Committee of the Board of Directors approved this transaction.