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Stockholders' Equity and Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 2012
Stockholders' Equity and Accumulated Other Comprehensive Loss |
Schedule of components of and changes in accumulated other comprehensive loss, net of related taxes |
|  | Balance |  |  |  | Balance |
|  | December 31, |  | Period |  | March 31, |
(Thousands of dollars) |  | 2011 |  | Change |  | 2012 |
Cumulative foreign currency translation adjustment |  | $ | (93,669 | ) | $ | 460 |  | $ | (93,209 | )
Unrealized gain on investments |  | (311 | ) | 1,484 |  | 1,173 |
Unrealized loss on cash flow hedges |  | - |  | (91 | ) | (91 | )
Unrecognized pension cost |  | (62,085 | ) | 1,077 |  | (61,008 | )
Accumulated other comprehensive loss |  | $ | (156,065 | ) | $ | 2,930 |  | $ | (153,135 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References No definition available. + Details
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