Common Stock	12 Months Ended
Dec. 31, 2011
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common Stock	Common Stock In 2011 and 2010, no common stock was issued from treasury. In 2009, 737,463 shares of common stock were issued from treasury for a contribution to the Company’s pension plans. An additional 1,154,265 shares of common stock were issued from treasury in 2009 as a result of the repurchase of convertible notes. In 2011, 2010 and 2009, the Company acquired 1,509,156 shares, 1,483,527 shares and 20,791 shares, respectively, of the Company’s common stock at a cost of $34,066, $28,100 and $314, 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 pursuant to those plans. These reacquired shares were placed in treasury. In 2011, 2010 and 2009, 2,075,385 shares, 544,366 shares and 744,125 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 2011 and 2010, no common stock was issued from treasury. In 2009, 737,463 shares of common stock were issued from treasury for a contribution to the Company’s pension plans. An additional 1,154,265 shares of common stock were issued from treasury in 2009 as a result of the repurchase of convertible notes. In 2011, 2010 and 2009, the Company acquired 1,509,156 shares, 1,483,527 shares and 20,791 shares, respectively, of the Company’s common stock at a cost of $34,066, $28,100 and $314, 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 pursuant to those plans. These reacquired shares were placed in treasury.

In 2011, 2010 and 2009, 2,075,385 shares, 544,366 shares and 744,125 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.