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8. Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]    
Accumulated other comprehensive income $ 274,901 $ 198,690
Foreign currency translation adjustments
    
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]    
Accumulated other comprehensive income 173,100 149,000
Other post-employment benefit adjustments
    
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]    
Accumulated other comprehensive income (8,100) 200
Net unrealized holding gains (losses) on available-for-sale investments
    
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]    
Accumulated other comprehensive income 109,700 49,300
Noncontrolling interests
    
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]    
Accumulated other comprehensive income 200 200
Total Accumulated Other Comprehensive Income
    
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]    
Accumulated other comprehensive income $ 274,700 $ 198,500