Net Income per Share (Tables)

12 Months Ended

Dec. 31, 2012

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:

	Year Ended December 31,
	2012		2011		2010
	(in thousands, except for share and per share amounts)
Numerator
Net income	$	108,460	$	76,448	$	72,481
Denominator
Weighted-average shares outstanding, basic	72,386		53,241		26,184
Effect of dilutive stock awards	205		274		506
Adjusted weighted-average shares outstanding, diluted	72,591		53,515		26,690
Net Income per Share
Basic earnings per common share	$	1.50	$	1.44	$	2.77
Diluted earnings per common share	$	1.49	$	1.43	$	2.72