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Stockholders' Equity and Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2012
Stockholders' Equity and Accumulated Other Comprehensive Loss |
Schedule of components of accumulated other comprehensive loss, net of related taxes |
|  | December 31, |
(Thousands of dollars) |  | 2012 |  | 2011 |  | 2010 |
Cumulative foreign currency translation adjustment |  | $ | (109,457 | ) | $ | (93,669 | ) | $ | (81,280 | )
Unrealized gain (loss) on investments |  | 2,232 |  | (311 | ) | 445 |
Unrealized loss on cash flow hedges |  | (113 | ) | - |  | - |
Unrecognized pension cost |  | (64,206 | ) | (62,085 | ) | (43,072 | )
Accumulated other comprehensive loss |  | $ | (171,544 | ) | $ | (156,065 | ) | $ | (123,907 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 + Details
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