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Restructuring Liability (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Restructuring activities    
Liability, beginning of the period $ 23,328 $ 26,313
Cash payments (3,573) (3,686)
Cash received from subleases 2,665 2,486
Restructuring expense 39 360
Liability, end of the period $ 22,459 $ 25,473