Earnings per Share (Tables)

9 Months Ended

Sep. 30, 2016

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,
	2016		2015		2016		2015
	(in thousands, except per share amounts)
Numerator
Net income	$	81,382	$	97,114	$	216,386	$	242,820
Denominator
Weighted-average shares outstanding, basic	69,727		71,738		70,689		72,432
Effect of dilutive stock awards	81		146		143		248
Adjusted weighted-average shares outstanding, diluted	69,808		71,884		70,832		72,680
Net income per share
Basic earnings per common share	$	1.17	$	1.35	$	3.06	$	3.35
Diluted earnings per common share	$	1.17	$	1.35	$	3.05	$	3.34
Anti-dilutive weighted-average shares	122		57		87		47