Net Income per Share (Tables)

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

Computation of basic and diluted earnings per common share

The following table sets forth the computation of basic and diluted earnings per common share:

	Three Months Ended March 31,
	2013		2012
	(in thousands, except per-share amounts)
Numerator
Net income	$	30,554	$	23,419
Denominator
Weighted-average shares outstanding, basic	72,486		72,292
Effect of dilutive stock awards	318		207
Adjusted weighted-average shares outstanding, diluted	72,804		72,499
Net Income per Share
Basic earnings per common share	$	0.42	$	0.32
Diluted earnings per common share	$	0.42	$	0.32