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Stock-Based Compensation
 6 Months Ended
Jun. 30, 2012
Stock-Based Compensation [Abstract]  
Stock-Based Compensation
13. Stock-Based Compensation
 
Our stock-based compensation plans are described in Note 15 of the 2011 annual report on Form 10-K. During the three months ended June 30, 2012 and 2011 we recognized total Stock-Based Compensation Expense of $2,218 and $1,191, respectively. During the six months ended June 30, 2012 and 2011 we recognized total Stock-Based Compensation Expense of $3,911 and $2,490, respectively. The total income tax benefit recognized in the income statement for share-based compensation arrangements during the six months ended June 30, 2012 and 2011 was $1,076 and $739, respectively.
 
During the first six months of 2012 we granted 33,147 restricted shares. The weighted average grant date fair value of each share awarded was $43.15. Restricted share awards generally have a 3 year vesting period from the effective date of the grant. The total fair value of shares vested during the six months ended June 30, 2012 and 2011 was $301 and $623, respectively.