Income Taxes (Tables)

3 Months Ended

Mar. 31, 2012

Income Taxes [Abstract]

Summary Of Changes To Company's Liabilities For UTPs

	Three Months Ended March 31,
	2012			2011
Liabilities for UTPs:
Opening balance — January 1	$	139,916		$	122,857
Current provision (benefit) for:
Unrecognized tax benefits		(7	)		(92	)
Potential additional interest		1,486			1,292
Potential additional penalties		7			355
Statute expirations		(948	)		(942	)
Tax settlements		—			(3,257	)
Ending balance — March 31	$	140,454		$	120,213