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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]      
Net income $ 17,643 $ 90,908 $ 105,931
Other comprehensive gain (loss), net of applicable taxes:      
Foreign currency translation adjustment 4,805 (3,347) (3,018)
Less: reclassification adjustment for translation gain included in other income 0 0 280
Foreign currency translation adjustment, net 4,805 (3,347) (2,738)
Unrealized (loss) gain on short-term investments (30) 12 (27)
Total other comprehensive gain (loss) 4,775 (3,335) (2,765)
Comprehensive income $ 22,418 $ 87,573 $ 103,166