Earnings per Share (Tables)

9 Months Ended

Sep. 30, 2015

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 September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
	(in thousands, except per share amounts)
Numerator
Net income	$	97,114	$	67,000	$	242,820	$	169,555
Denominator
Weighted-average shares outstanding, basic	71,738		72,755		72,432		72,727
Effect of dilutive stock awards	146		548		248		557
Adjusted weighted-average shares outstanding, diluted	71,884		73,303		72,680		73,284
Net income per share
Basic earnings per common share	$	1.35	$	0.92	$	3.35	$	2.33
Diluted earnings per common share	$	1.35	$	0.91	$	3.34	$	2.31
Anti-dilutive weighted-average shares	57		—		47		38