Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Earnings per share

		Three months ended March 31,
		2015		2014
Net earnings		$	112,917	$	107,911
Less: net earnings attributable to unvested restricted stock			(1,641)		(1,692)
	Net earnings available to common stock	$	111,276	$	106,219
Weighted-average common shares outstanding			94,881		98,662
Dilutive effect of outstanding securities (determined using treasury stock method)			316		251
	Weighted-average common shares and potential common shares outstanding		95,197		98,913
Earnings per common share
	Basic	$	1.17	$	1.08
	Diluted	$	1.17	$	1.07