Income Taxes (Tables)

6 Months Ended

Jun. 30, 2012

Income Tax Disclosure [Abstract]

Schedule Of Income Taxes

	Three months ended						Six months ended
($ in thousands)	June 30, 2012			June 30, 2011			June 30, 2012			June 30, 2011
Provision (benefit) for income taxes	$	28,537		$	8,859		$	33,062		$	(20,587	)
Effective tax rate	36		%	49		%	59		%	17		%