Earnings per Share (Tables)

9 Months Ended

Sep. 30, 2011

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The following table sets forth the computation of basic and diluted earnings per share for the three and nine months ended September 30, 2011 and 2010:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2011		2010		2011		2010
	(in thousands, except per share amounts)
Basic and diluted
Net income	$	72,614	$	21,205	$	108,295	$	46,063
Weighted average common shares outstanding, basic	53,534		52,991		53,414		52,773
Plus: net effect of dilutive stock options and restricted common shares	726		368		828		232
Weighted average common shares outstanding, diluted	54,260		53,359		54,242		53,005
Earnings per share, basic	$	1.36	$	0.40	$	2.03	$	0.87
Earnings per share, diluted	$	1.34	$	0.40	$	2.00	$	0.87