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Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Consolidated Statements Of Comprehensive Income [Abstract] |  |  |  |  |
Net income | $ 2,878 | $ 19,010 | $ 51,959 | $ 79,758 | $ 53,381
Other comprehensive income (loss): |  |  |  |  |
Foreign currency translation adjustments |  |  | (6,903) | (2,318) | 4,393
Unrealized loss on investments, net of tax |  |  | 526 | 536 | 924
Other |  |  | (111) | (187) | (125)
Comprehensive income |  |  | 45,471 | 77,789 | 58,573
Foreign currency translation losses | (9,674) | (2,771) | (9,674) | (2,771) |
Unrealized loss on investments, net of tax | (3,327) | (3,853) | (3,327) | (3,853) |
Other | (449) | (338) | (449) | (338) |
Accumulated other comprehensive loss | $ (13,450) | $ (6,962) | $ (13,450) | $ (6,962) |

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