The following table reflects the calculation of basic and diluted earnings per share from continuing operations. During each period, certain options, as noted below, were excluded from the calculation of diluted earnings per share because their effect would have been antidilutive.

	2011			2010			2009
Earnings per share – basic:
Income from continuing operations	$	144,595		$	153,395		$	99,365
Income allocated to participating securities		(823	)		(804	)		(751	)
Income available to common shareholders	$	143,772		$	152,591		$	98,614

Weighted-average shares outstanding		51,036			51,123			50,837
Earnings per share – basic	$	2.82		$	2.98		$	1.94

Earnings per share – diluted:
Income from continuing operations	$	144,595		$	153,395		$	99,365
Income allocated to participating securities		(586	)		(802	)		(751	)
Re-measurement of share-based awards classified as liabilities		(20	)		79			(18	)
Income available to common shareholders	$	143,989		$	152,672		$	98,596

Weighted-average shares outstanding		51,036			51,123			50,837
Dilutive impact of potential common shares		379			202			88
Weighted-average shares and potential common shares outstanding		51,415			51,325			50,925

Earnings per share – diluted	$	2.80		$	2.97		$	1.94

Antidilutive options excluded from calculation		1,835			2,324			2,128