Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2014

Earnings Per Share [Abstract]

Earnings per share

		Three months ended March 31,
		2014		2013
Net earnings		$	107,911	$	105,850
Less: net earnings attributable to unvested restricted stock			(1,692)		(1,782)
	Net earnings available to common stock	$	106,219	$	104,068
Weighted-average common shares outstanding			98,662		99,056
Dilutive effect of outstanding securities (determined using treasury stock method)			251		231
	Weighted-average common shares and potential common shares outstanding		98,913		99,287
Earnings per common share
	Basic	$	1.08	$	1.05
	Diluted	$	1.07	$	1.05