Common Stock	12 Months Ended
Dec. 31, 2012
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common Stock	Common Stock In 2012, 2011 and 2010, no common stock was issued from treasury. In 2012, 2011 and 2010, the Company acquired 700,000 shares, 1,509,156 shares and 1,483,527 shares, respectively, of the Company’s common stock at a cost of $19,037, $34,066 and $28,100, 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. These reacquired shares were placed in treasury. In 2012, 2011 and 2010, 608,227 shares, 2,075,385 shares and 544,366 shares of common stock, respectively, were issued from authorized shares for the exercise of stock options, various other incentive awards and purchases by the Employee Stock Purchase Plan.

Common Stock

In 2012, 2011 and 2010, no common stock was issued from treasury. In 2012, 2011 and 2010, the Company acquired 700,000 shares, 1,509,156 shares and 1,483,527 shares, respectively, of the Company’s common stock at a cost of $19,037, $34,066 and $28,100, 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. These reacquired shares were placed in treasury.

In 2012, 2011 and 2010, 608,227 shares, 2,075,385 shares and 544,366 shares of common stock, respectively, were issued from authorized shares for the exercise of stock options, various other incentive awards and purchases by the Employee Stock Purchase Plan.