Quarterly Results (Unaudited)

12 Months Ended

Dec. 31, 2012

Quarterly Results (Unaudited) [Abstract]

Quarterly Results (Unaudited)

(13) Quarterly Results (Unaudited)

The unaudited quarterly results for the year ended December 31, 2012 were as follows (in thousands, except per share amounts):

	Three Months Ended
	March 31, 2012			June 30, 2012			September 30, 2012			December 31, 2012
Revenues	$	566,935		$	511,848		$	521,324		$	512,551
Costs and expenses		477,847			428,219			428,647			413,098
Gain (loss) on disposition of assets		(28	)		69			(40	)		(15	)
Operating income		89,060			83,698			92,637			99,438
Other income (expense)		149			30			(56	)		(45	)
Interest expense		(5,840	)		(5,901	)		(6,056	)		(6,588	)
Earnings before taxes on income		83,369			77,827			86,525			92,805
Provision for taxes on income		(31,490	)		(29,392	)		(32,794	)		(34,231	)
Net earnings		51,879			48,435			53,731			58,574
Less: Net earnings attributable to noncontrolling interests		(935	)		(884	)		(676	)		(686	)
Net earnings attributable to Kirby	$	50,944		$	47,551		$	53,055		$	57,888
Net earnings per share attributable to Kirby common stockholders:
Basic	$	.91		$	.85		$	.95		$	1.03
Diluted	$	.91		$	.85		$	.95		$	1.03

The unaudited quarterly results for the year ended December 31, 2011 were as follows (in thousands, except per share amounts):

	Three Months Ended
	March 31, 2011			June 30, 2011			September 30, 2011			December 31, 2011
Revenues	$	299,359		$	437,331		$	563,582		$	550,145
Costs and expenses		243,650			365,892			471,371			457,121
Gain (loss) on disposition of assets		(66	)		40			97			(111	)
Operating income		55,643			71,479			92,308			92,913
Other income (expense)		51			78			(6	)		183
Interest expense		(2,833	)		(3,278	)		(5,974	)		(5,817	)
Earnings before taxes on income		52,861			68,279			86,328			87,279
Provision for taxes on income		(19,961	)		(26,050	)		(32,734	)		(30,510	)
Net earnings		32,900			42,229			53,594			56,769
Less: Net earnings attributable to noncontrolling interests		(470	)		(537	)		(860	)		(599	)
Net earnings attributable to Kirby	$	32,430		$	41,692		$	52,734		$	56,170
Net earnings per share attributable to Kirby common stockholders:
Basic	$	.60		$	.78		$	.95		$	1.01
Diluted	$	.60		$	.77		$	.94		$	1.00

Quarterly basic and diluted earnings per share may not total to the full year per share amounts, as the weighted average number of shares outstanding for each quarter fluctuates as a result of the assumed exercise of stock options.