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Restructuring Charges (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Summary of changes in accrued liability  
Beginning balance at December 31, 2010 $ 0
Additions for costs expensed 11,627
Less non-cash expenses (1,575)
Reductions for payments (8,276)
Ending balance at December 31, 2011 $ 1,776