Earnings per Share

6 Months Ended

Jun. 30, 2013

Earnings per Share [Abstract]

Earnings per Share

(3) Earnings per Share

The following table sets forth the calculation of basic and diluted weighted average shares outstanding and earnings per share for the indicated periods.

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2013		2012		2013		2012
	(in thousands, except for share data)
Income (numerator):
Net income	$	69,579	$	35,401	$	98,616	$	36,904
Net income attributable to participating securities		(737)		(254)		(1,015)		(245)
Net income attributable to common shares	$	68,842	$	35,147	$	97,601	$	36,659
Weighted average shares (denominator):
Weighted average shares—basic		38,871		38,914		38,847		39,018
Dilutive effect of stock options		512		113		455		114
Weighted average shares—diluted		39,383		39,027		39,302		39,132
Basic earnings per share	$	1.77	$	0.90	$	2.51	$	0.94
Diluted earnings per share	$	1.75	$	0.90	$	2.48	$	0.94

The following table indicates the number of shares underlying outstanding stock-based awards excluded from the computation of dilutive weighted average shares because their effect was antidilutive for the periods indicated.

	Three Months Ended				Six Months Ended
	June 30,				June 30,
(in thousands)	2013		2012		2013		2012
Weighted average shares		195		624		191		597