EARNINGS PER SHARE (Tables)

3 Months Ended

Mar. 31, 2013

EARNINGS PER SHARE [Abstract]

Components of basic and diluted earnings per share

The following table presents the components of basic and diluted earnings per share for the three months ended March 31, 2013 and 2012 (in thousands, except per share amounts):

	Three months ended March 31,
	2013			2012
Net earnings attributable to Kirby	$	56,578		$	50,944
Undistributed earnings allocated to restricted shares		(401	)		(393	)
Income available to Kirby common stockholders – basic		56,177			50,551
Undistributed earnings allocated to restricted shares		401			393
Undistributed earnings reallocated to restricted shares		(399	)		(391	)
Income available to Kirby common stockholders – diluted	$	56,179		$	50,553
Shares outstanding:
Weighted average common stock issued and outstanding		56,669			55,808
Weighted average unvested restricted stock		(401	)		(430	)
Weighted average common stock outstanding – basic		56,268			55,378
Dilutive effect of stock options		187			257
Weighted average common stock outstanding – diluted		56,455			55,635
Net earnings per share attributable to Kirby common stockholders:
Basic	$	1.00		$	.91
Diluted	$	1.00		$	.91