Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2012

Earnings Per Share [Abstract]

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

The following table presents the computations for basic and diluted earnings per common share:

	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
	(in thousands, except shares and per share amounts)
Numerator:
Net income	$	320,886	$	7,555	$	334,177	$	12,972
Denominator:
Weighted average shares outstanding - basic	62,112,936		61,943,851		62,095,670		61,937,353
Dilutive securities outstanding	497,118		368,373		552,482		382,675
Weighted average shares outstanding - diluted	62,610,054		62,312,224		62,648,152		62,320,028
Earnings per share - basic	$	5.17	$	0.12	$	5.38	$	0.21
Earnings per share - diluted	$	5.13	$	0.12	$	5.33	$	0.21
Antidilutive securities outstanding (weighted average):
Stock options	9,875		16,493		12,533		17,093
Restricted shares	484		22,752		1,836		50,798
Total antidilutive securities outstanding	10,359		39,245		14,369		67,891