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Stock-Based Compensation
 6 Months Ended
Jun. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation
Stock-Based Compensation
The company's 2013 Omnibus Incentive Plan (the "2013 Omnibus Plan") was approved by shareholders on May 7, 2013 during the 2013 annual meeting and replaces the 2003 Incentive Stock and Awards Plan (the "2003 Stock Plan") and 2004 Non-Employee Director Stock and Awards Plan (the "2004 Stock Plan") as of May 7, 2013. The 2013 Omnibus Plan also replaces the company's Short-Term Incentive Plan (the "STIP") as of December 31, 2013. The 2003 Stock Plan, the 2004 Stock Plan and the STIP may be effectively referred to as the "Existing Plans." No new awards may be granted under the Existing Plans and after the respective termination dates, but the Existing Plans will continue to govern awards outstanding as of the date they are terminated and outstanding awards will continue in force and effect until vested, exercised or forfeited pursuant to their terms. The 2013 Omnibus Plan provides for both short-term and long-term incentive awards for employees and Non-Employee Directors. Stock-based awards may take the form of stock options, stock appreciation rights, restricted stock, restricted stock units, and performance share or performance unit awards. The total number of shares of the company's common stock originally available for awards under the 2013 Omnibus Plan is 8.0 million shares and is subject to adjustments for stock splits, stock dividends and certain other transactions or events in the future.
Stock-based compensation expense was $4.5 million and $3.7 million for the three months ended June 30, 2013 and 2012, respectively.  Stock-based compensation expense was $9.0 million and $8.6 million for the six months ended June 30, 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 two 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 two quarters of 2013, and 0.2 million shares of restricted stock to directors and employees during the first two quarters 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 to 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 0.8 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.