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Pension and Other Postretirement Benefits (Details 2)
In Thousands, unless otherwise specified
Dec. 31, 2012
U.S. Pension Benefits [Member]
USD ($)
Dec. 31, 2011
U.S. Pension Benefits [Member]
USD ($)
Dec. 31, 2010
U.S. Pension Benefits [Member]
USD ($)
Dec. 31, 2012
Foreign Pension Benefits [Member]
USD ($)
Dec. 31, 2012
Foreign Pension Benefits [Member]
GBP (£)
Dec. 31, 2011
Foreign Pension Benefits [Member]
USD ($)
Dec. 31, 2011
Foreign Pension Benefits [Member]
GBP (£)
Dec. 31, 2010
Foreign Pension Benefits [Member]
USD ($)
Dec. 31, 2012
Other Postretirement Benefits [Member]
USD ($)
Dec. 31, 2011
Other Postretirement Benefits [Member]
USD ($)
Dec. 31, 2010
Other Postretirement Benefits [Member]
USD ($)
Funded status of the plans:                      
Fair value of plan assets $ 140,218 [1] $ 133,403 [1] $ 135,730 [1] $ 41,875 £ 25,774 $ 36,436 £ 23,443 $ 34,836 $ 0 $ 0 $ 0
Less benefit obligations 197,057 [1] 174,814 [1] 153,595 [1] 59,210   50,698   47,009 22,806 22,348 17,058
Funded status at December 31 $ (56,839) [1] $ (41,411) [1]   $ (17,335)   $ (14,262)     $ (22,806) $ (22,348)  
[1] Includes the non-qualified defined benefit pension plan.