Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2012

Stockholders' Equity

Components of basic and diluted earnings per share

	Three months ended			Six months ended
	June 30,			June 30,
	2012		2011	2012	2011
	(in thousands, except per share amounts)
Net income	$	41,718	49,970	89,105	95,603
Weighted average shares outstanding - basic	86,093		86,264	85,848	86,040
Dilutive potential shares from stock options	2		11	3	17
Weighted average shares outstanding - diluted	86,095		86,275	85,851	86,057
Earnings per share:
Basic	$	0.48	0.58	1.04	1.11
Diluted	$	0.48	0.58	1.04	1.11