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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net income $ 48,846 $ 45,852 $ 27,195
Other comprehensive income (loss):      
Unrealized gain on available-for-sale securities 963 594  
Reclassification of unrealized gain to a realized gain on available-for-sale securities (1,557)    
Foreign currency translation adjustments 3,824 (2,711) (279)
Total other comprehensive income (loss): 3,230 (2,117) (279)
Comprehensive income $ 52,076 $ 43,735 $ 26,916