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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2010
Convertible Senior Debentures, Due 2040 [Member]
Dec. 31, 2011
Convertible Senior Debentures, Due 2040 [Member]
Dec. 31, 2011
Convertible Senior Debentures, Due 2041 [Member]
Dec. 31, 2011
U.S. Plans [Member]
Dec. 31, 2010
U.S. Plans [Member]
Dec. 31, 2009
U.S. Plans [Member]
Dec. 31, 2011
Non-U.S. Plans [Member]
Dec. 31, 2010
Non-U.S. Plans [Member]
Dec. 31, 2009
Non-U.S. Plans [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
U.S. Plans [Member]
Equity Securities [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 1 [Member]
U.S. Plans [Member]
Equity Securities [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
U.S. Plans [Member]
Fixed Income Securities [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 1 [Member]
U.S. Plans [Member]
Fixed Income Securities [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
U.S. Plans [Member]
Real Estate Investment Trust Securities [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 1 [Member]
U.S. Plans [Member]
Real Estate Investment Trust Securities [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
U.S. Plans [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 1 [Member]
U.S. Plans [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
Non-U.S. Plans [Member]
Equity Securities [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 1 [Member]
Non-U.S. Plans [Member]
Equity Securities [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
Non-U.S. Plans [Member]
Fixed Income Securities [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 1 [Member]
Non-U.S. Plans [Member]
Fixed Income Securities [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
Non-U.S. Plans [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 1 [Member]
Non-U.S. Plans [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
U.S. Plans [Member]
Equity Securities [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
U.S. Plans [Member]
Equity Securities [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
U.S. Plans [Member]
Fixed Income Securities [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
U.S. Plans [Member]
Fixed Income Securities [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
U.S. Plans [Member]
Real Estate Investment Trust Securities [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
U.S. Plans [Member]
Real Estate Investment Trust Securities [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
U.S. Plans [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
U.S. Plans [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Non-U.S. Plans [Member]
Equity Securities [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
Non-U.S. Plans [Member]
Equity Securities [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Non-U.S. Plans [Member]
Fixed Income Securities [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
Non-U.S. Plans [Member]
Fixed Income Securities [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Non-U.S. Plans [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
Non-U.S. Plans [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
Convertible Senior Debentures, Due 2040 [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 3 [Member]
Convertible Senior Debentures, Due 2040 [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
Convertible Senior Debentures, Due 2041 [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
U.S. Plans [Member]
Equity Securities [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 3 [Member]
U.S. Plans [Member]
Equity Securities [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
U.S. Plans [Member]
Fixed Income Securities [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 3 [Member]
U.S. Plans [Member]
Fixed Income Securities [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
U.S. Plans [Member]
Real Estate Investment Trust Securities [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 3 [Member]
U.S. Plans [Member]
Real Estate Investment Trust Securities [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
U.S. Plans [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 3 [Member]
U.S. Plans [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
Non-U.S. Plans [Member]
Equity Securities [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 3 [Member]
Non-U.S. Plans [Member]
Equity Securities [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
Non-U.S. Plans [Member]
Fixed Income Securities [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 3 [Member]
Non-U.S. Plans [Member]
Fixed Income Securities [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
Non-U.S. Plans [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 3 [Member]
Non-U.S. Plans [Member]
Cash and Cash Equivalents [Member]
Assets:                                                                                                                            
Assets held in rabbi trusts $ 31,698 $ 25,585                   $ 20,569 $ 15,575                             $ 11,129 $ 10,010                             $ 0 $ 0                                  
Fair value of plan assets 274,589 270,984       239,045 238,523 216,641 35,544 32,461 34,762     138,379 142,808 40,606 39,063 6,486 6,339 338 2,143 6,815 7,751 10,173 8,538 18,556 16,172     0 0 53,236 48,170 0 0 0 0 0 0 0 0 0 0           0 0 0 0 0 0 0 0 0 0 0 0 0 0
Available for sale securities 6,776 5,736                   6,776 5,736                             0 0                             0 0                                  
Fair Value Assets 313,063 302,305                   248,698 244,125                             64,365 58,180                             0 0                                  
Fair Value Assets 313,063 302,305                   248,698 244,125                             64,365 58,180                             0 0                                  
Liabilities:                                                                                                                            
Embedded derivative     (319) (594) (392)                                                                                 (594) (319) (392)                            
Long-term Debt, Fair Value                                                       533,900 624,800                                                                  
Convertible debentures issuance date     November 9, 2010   May 13, 2011                                                                                                                  
Long-term Debt $ 398,068 $ 431,363