Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011
Summary of Changes To Company's Liabilities For UTPs
Opening balance - January 1	$ 139,916	$ 122,857
Unrecognized tax benefits	(115)	2,722
Potential additional interest	3,094	2,803
Potential additional penalties	6	1,153
Statute expirations	(1,072)	(942)
Tax settlements		(3,257)
Ending balance - June 30	$ 141,829	$ 125,336

This element represents the recognized expense for the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties or, if not recognizing the expense in the period in which the tax return was initially filed, the expense is generally recognized in the period in which the enterprise's judgment about meeting the minimum statutory threshold changes.

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This element represents interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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