Stock Repurchase Plan	3 Months Ended
Mar. 31, 2013
Text Block [Abstract]
Stock Repurchase Plan	8. Stock Repurchase Plan As of December 31, 2011, the Company’s Board of Directors had approved a stock repurchase program authorizing the Company, from time to time as market and business conditions warrant, to acquire up to $210 million of its common stock. In February 2012, the Company’s Board of Directors approved an increase of $52.1 million to their current stock repurchase authorization, bringing the total authorization to $262.1 million. On September 13, 2012, the Company’s Board of Directors approved the repurchase of up to 2,500,000 shares of the Company’s common stock, or up to $113.0 million in place of the remaining repurchase amounts previously authorized. The Company did not repurchase any shares under the program during the three months ended March 31, 2013. Under the program to date, the Company has purchased 9,519,872 shares for approximately $244.9 million. The maximum remaining authorized for purchase under the stock repurchase program was approximately 1.8 million shares or $88.2 million as of March 31, 2013.

8. Stock Repurchase Plan

As of December 31, 2011, the Company’s Board of Directors had approved a stock repurchase program authorizing the Company, from time to time as market and business conditions warrant, to acquire up to $210 million of its common stock. In February 2012, the Company’s Board of Directors approved an increase of $52.1 million to their current stock repurchase authorization, bringing the total authorization to $262.1 million.

On September 13, 2012, the Company’s Board of Directors approved the repurchase of up to 2,500,000 shares of the Company’s common stock, or up to $113.0 million in place of the remaining repurchase amounts previously authorized.

The Company did not repurchase any shares under the program during the three months ended March 31, 2013. Under the program to date, the Company has purchased 9,519,872 shares for approximately $244.9 million. The maximum remaining authorized for purchase under the stock repurchase program was approximately 1.8 million shares or $88.2 million as of March 31, 2013.