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Stockholders' Equity and Accumulated Other Comprehensive Loss (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Stockholders' Equity and Accumulated Other Comprehensive Loss |  |  |
Stock repurchase programs, authorized amount | $ 100,000,000 |  |
Remaining authorized repurchase amount under November 2009 share repurchase program | 33,204,000 |  |
Common shares repurchased | 12,937 | 5,282 | 20,879
Repurchase of common stock | 26,830,000 | 9,971,000 | 29,994,000
Components of accumulated other comprehensive loss, net of related taxes |  |  |
Cumulative foreign currency translation adjustment | (109,457,000) | (93,669,000) | (81,280,000)
Unrealized gain (loss) on investments | 2,232,000 | (311,000) | 445,000
Unrealized loss on cash flow hedges | (113,000) |  |
Unrecognized pension cost | (64,206,000) | (62,085,000) | (43,072,000)
Accumulated other comprehensive loss | (171,544,000) | (156,065,000) | (123,907,000)
Net assets of Sugar segment denominated in Argentine pesos | 193,380,000 | 215,921,000 |
Net assets of Sugar segment denominated in U.S. dollars | 5,843,000 | 4,608,000 |
Income tax rate for foreign currency translation gains and losses (as a percent) | 35.00% | 35.00% | 35.00%
Effective income tax rate for components of accumulated other comprehensive loss (as a percent) | 39.00% | 39.00% | 39.00%
Unrecognized pension cost related to employees at certain subsidiaries | 21,129,000 | 20,362,000 |
Common stock dividend declared and paid (in dollars per share) | $ 12.00 |  | $ 9.00
Common stock dividend historical amount on a quarterly basis (in dollars per share) | $ 0.75 |  |
Common stock dividend historical amount on annual (in dollars per share) | $ 3.00 |  |
Prepayment of dividend for 2013 | $ 3.00 |  |
Prepayment of dividend for 2014 | $ 3.00 |  |
Prepayment of dividend for 2015 | $ 3.00 |  |
Prepayment of dividend for 2016 | $ 3.00 |  |
Prepayment of dividend for 2011 | $ 3.00 |  |
Prepayment of dividend for 2012 | $ 3.00 |  |
Pension settlement loss | (1,796,000) |  |
Pension curtailment loss | (1,134,000) |  |
Pension settlement and curtailment loss | $ (2,930,000) |  |

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