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Subsequent Event (Results Of Operations) (Details) (Arrowhead [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Arrowhead [Member]
Subsequent Event [Line Items]
Total revenues	$ 1,121,886
Income before income taxes	287,720
Net income	$ 174,143
Net income per share, Basic	$ 1.22
Net income per share, Diluted	$ 1.20
Weighted average number of shares outstanding, Basic	138,582
Weighted average number of shares outstanding, Diluted	140,264

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