Earnings Per Share

3 Months Ended

Mar. 31, 2012

Earnings Per Share [Abstract]

Earnings Per Share

(4) Earnings Per Share

Earnings per common share attributable to Landstar are based on the weighted average number of common shares outstanding, which includes outstanding non-vested restricted stock. Diluted earnings per share attributable to Landstar are based on the weighted average number of common shares outstanding plus the incremental shares that would have been outstanding upon the assumed exercise of all dilutive stock options.

The following table provides a reconciliation of the average number of common shares outstanding used to calculate earnings per share attributable to Landstar to the average number of common shares and common share equivalents outstanding used to calculate diluted earnings per share attributable to Landstar (in thousands):

	Thirteen Weeks Ended
	March 31, 2012		March 26, 2011
Average number of common shares outstanding		46,800		47,870
Incremental shares from assumed exercises of stock options		261		30
Average number of common shares and common share equivalents outstanding		47,061		47,900

For the thirteen-week period ended March 31, 2012, no options outstanding to purchase shares of common stock were excluded from the calculation of diluted earnings per share attributable to Landstar because they were antidilutive. For the thirteen-week period ended March 26, 2011, there were 584,813 options outstanding to purchase shares of common stock excluded from the calculation of diluted earnings per share attributable to Landstar because they were antidilutive. For the thirteen-week period ended March 31, 2012, RSUs were excluded from the calculation of diluted earnings per share attributable to Landstar because the performance metrics requirements for vesting have not been satisfied.