Common Stock	12 Months Ended
Dec. 31, 2018
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common Stock	Common Stock There were no shares of common stock issued from treasury in 2018, 2017 or 2016. In 2018, 2017 and 2016, the Company acquired 2,292,100 shares, 677,100 shares and 550,994 shares, respectively, of the Company’s common stock at a cost of $138,275, $40,791 and $20,520, respectively. These amounts exclude shares reacquired to pay for the related income tax upon issuance of shares in accordance with the terms of the Company’s stockholder-approved equity compensation plans and the equity rights granted under those plans ("Reacquired Shares"). These Reacquired Shares were placed in treasury. In 2018, 2017 and 2016, 332,893 shares, 341,837 shares and 621,259 shares of common stock, respectively, were issued from authorized shares for the exercise of stock options, various other incentive awards and purchases by the Company's Employee Stock Purchase Plan.

Common Stock

There were no shares of common stock issued from treasury in 2018, 2017 or 2016.

In 2018, 2017 and 2016, the Company acquired 2,292,100 shares, 677,100 shares and 550,994 shares, respectively, of the Company’s common stock at a cost of $138,275, $40,791 and $20,520, respectively. These amounts exclude shares reacquired to pay for the related income tax upon issuance of shares in accordance with the terms of the Company’s stockholder-approved equity compensation plans and the equity rights granted under those plans ("Reacquired Shares"). These Reacquired Shares were placed in treasury.

In 2018, 2017 and 2016, 332,893 shares, 341,837 shares and 621,259 shares of common stock, respectively, were issued from authorized shares for the exercise of stock options, various other incentive awards and purchases by the Company's Employee Stock Purchase Plan.