Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2013

Earnings Per Share [Abstract]

Computation of Earnings Per Common Share

Following is a summary of the information used in the computation of earnings per common share using the two-class method (in thousands, except per share amounts):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2013		2012		2013		2012
Numerator:
Net income to common shareholders	$	33,202	$	46,984	$	128,640	$	104,783
Net income allocated to participating securities — basic and diluted		616		281		2,398		844
Net income allocated to common shareholders—basic and diluted	$	32,586	$	46,703	$	126,242	$	103,939
Denominator:
Weighted-average common shares—basic		82,091		84,777		83,404		84,757
Dilutive potential common shares		114		855		92		768
Weighted average common shares—diluted		82,205		85,632		83,496		85,525
Earnings per common share:
Basic	$	0.40	$	0.55	$	1.51	$	1.23
Diluted	$	0.40	$	0.55	$	1.51	$	1.22