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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]      
Net income $ 63,868 $ 48,846 $ 45,852
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 (9,284) 3,824 (2,711)
Total other comprehensive income (loss): (9,284) 3,230 (2,117)
Comprehensive income $ 54,584 $ 52,076 $ 43,735