Related Party Transactions	9 Months Ended
Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	NOTE P – RELATED PARTY TRANSACTIONS On February 6, 2018, the Company purchased 7,877 shares of the Company from current Officers and a retired Officer at a price per share of $80.20, 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 March 15, 2018, the Company purchased 1,430 shares of the Company from a current Officer at a price per share of $63.63, 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 10, 2018, the Company purchased 3,200 shares of the Company from a current Officer at a price per share of $68.10, 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 June 1, 2018, the Company purchased 8,800 shares of the Company from a retired Officer at a price per share of $73.53, 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 June 15, 2018, the Company purchased 1,500 shares of the Company from current Officers at a price per share of $77.06, 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 7, 2018, the Company purchased 17,141 shares of the Company from current Officers and a retired officer at a price per share of $87.19, 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 23, 2018, the Company purchased 2,000 shares of the Company from a current employee at a price per share of $83.53, 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 September 14, 2018, the Company purchased 7,500 shares of the Company from a current Officer at a price per share of $80.95, 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.

NOTE P – RELATED PARTY TRANSACTIONS

On February 6, 2018, the Company purchased 7,877 shares of the Company from current Officers and a retired Officer at a price per share of $80.20, 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 March 15, 2018, the Company purchased 1,430 shares of the Company from a current Officer at a price per share of $63.63, 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 10, 2018, the Company purchased 3,200 shares of the Company from a current Officer at a price per share of $68.10, 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 June 1, 2018, the Company purchased 8,800 shares of the Company from a retired Officer at a price per share of $73.53, 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 June 15, 2018, the Company purchased 1,500 shares of the Company from current Officers at a price per share of $77.06, 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 7, 2018, the Company purchased 17,141 shares of the Company from current Officers and a retired officer at a price per share of $87.19, 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 23, 2018, the Company purchased 2,000 shares of the Company from a current employee at a price per share of $83.53, 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 September 14, 2018, the Company purchased 7,500 shares of the Company from a current Officer at a price per share of $80.95, 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.