Earnings per Share (Tables)

6 Months Ended

Jun. 30, 2014

Earnings Per Share [Abstract]

Schedule of calculation of basic and diluted earnings per share

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

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2014		2013		2014		2013
	(in thousands, except per share amounts)
Net income	$	59,780	$	76,522	$	125,387	$	93,249
Basic weighted-average common shares outstanding	67,069		66,295		67,063		66,254
Add: dilutive effect of stock options, unvested RSUs, and contingent PSUs	1,170		1,598		1,117		1,457
Diluted weighted-average common shares outstanding	68,239		67,893		68,180		67,711
Basic net income per common share	$	0.89	$	1.15	$	1.87	$	1.41
Diluted net income per common share	$	0.88	$	1.13	$	1.84	$	1.38