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Stockholders' Equity and Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2011
Stockholders' Equity and Accumulated Other Comprehensive Loss  
Schedule of components of accumulated other comprehensive loss, net of related taxes

 

 

 

 

December 31,

 

(Thousands of dollars)

 

2011

 

2010

 

2009

 

 

 

 

 

 

 

 

 

Cumulative foreign currency translation adjustment

 

$

(93,669

)

$

(81,280

)

$

(77,576

)

Unrealized gain (loss) on investments

 

(311

)

445

 

2,579

 

Unrecognized pension cost

 

(62,085

)

(43,072

)

(39,789

)

 

 

 

 

 

 

 

 

Accumulated other comprehensive loss

 

$

(156,065

)

$

(123,907

)

$

(114,786

)