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Stock-Based Compensation
 3 Months Ended
Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation
Stock-Based Compensation
Stock-based compensation expense was $4.5 million and $4.9 million for the three months ended March 31, 2013 and 2012, respectively.  The company granted options to acquire 0.4 million and 0.7 million shares of common stock to officers and employees during the first quarters of 2013 and 2012, respectively.  In addition, the company issued a total of 0.1 million shares of restricted stock to directors during the first quarter of 2013, and 0.2 million shares of restricted stock to directors and employees during the first quarter of 2012.  The restrictions on all shares of restricted stock expire on the third anniversary of the applicable grant date.
Performance shares granted are earned based on the extent to which performance goals are met over the applicable performance period.  The performance goals and the applicable performance period vary for each grant year.  The performance shares granted in 2013 and 2012 are earned based on the extent which performance goals are met by the company over three-year periods from January 1, 2013 to December 31, 2015, and January 1, 2012 to December 31, 2014, respectively.  The performance goals for the performance shares granted in 2013 are based fifty percent (50%) on total shareholder return relative to a peer group of companies over the three-year period and fifty percent (50%) on debt reduction over the three-year period. The performance goals for the performance shares granted in 2012 are based fifty percent (50%) on total shareholder return relative to a peer group of companies over the three-year period and fifty percent (50%) on improvement in the company’s total leverage ratio over the three-year period.  Depending on the foregoing factors, the number of shares awarded could range from zero to 1.0 million and zero to 0.7 million for the 2013 and 2012 performance share grants, respectively. 
The company recognizes stock-based compensation expense over the stock-based awards’ vesting period.