Long-Term Debt	3 Months Ended
Mar. 31, 2012
Debt Disclosure [Abstract]
Long-Term Debt	Note 5 - Long-Term Debt Senior Notes The Company satisfied its obligations to exchange its $350.0 million outstanding 6.50% Senior Notes due 2021 and its $350.0 million outstanding 6.625% Senior Notes due 2019 for notes registered under the Securities Act of 1933, as amended, on March 7, 2012, and January 12, 2012, respectively. 3.50% Senior Convertible Notes Due 2027 Subsequent to March 31, 2012, the Company called for redemption all of its outstanding 3.50% Senior Convertible Notes due 2027 (“3.50% Senior Convertible Notes”). As a result of the redemption notice, the 3.50% Senior Convertible Notes became eligible for conversion until April 30, 2012, and holders of $281.3 million aggregate principal amount of the 3.50% Senior Convertible Notes surrendered their 3.50% Senior Convertible Notes for conversion on or prior to that date. The Company settled and will settle the principal amount of all converted 3.50% Senior Convertible Notes in cash and any excess conversion value with shares of its common stock. The Company redeemed the remaining 3.50% Senior Convertible Notes that were not converted on the redemption date, May 2, 2012, at par plus accrued interest. The Company used and will use funds borrowed under its credit facility to settle the conversion and redemption of its 3.50% Senior Convertible Notes.

Long-Term Debt

3 Months Ended

Mar. 31, 2012

Note 5 - Long-Term Debt

Senior Notes

The Company satisfied its obligations to exchange its $350.0 million outstanding 6.50% Senior Notes due 2021 and its $350.0 million outstanding 6.625% Senior Notes due 2019 for notes registered under the Securities Act of 1933, as amended, on March 7, 2012, and January 12, 2012, respectively.

3.50% Senior Convertible Notes Due 2027

Subsequent to March 31, 2012, the Company called for redemption all of its outstanding 3.50% Senior Convertible Notes due 2027 (“3.50% Senior Convertible Notes”). As a result of the redemption notice, the 3.50% Senior Convertible Notes became eligible for conversion until April 30, 2012, and holders of $281.3 million aggregate principal amount of the 3.50% Senior Convertible Notes surrendered their 3.50% Senior Convertible Notes for conversion on or prior to that date. The Company settled and will settle the principal amount of all converted 3.50% Senior Convertible Notes in cash and any excess conversion value with shares of its common stock. The Company redeemed the remaining 3.50% Senior Convertible Notes that were not converted on the redemption date, May 2, 2012, at par plus accrued interest. The Company used and will use funds borrowed under its credit facility to settle the conversion and redemption of its 3.50% Senior Convertible Notes.