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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 Comprehensive Income [Abstract]      
Net income $ 27,199 $ 26,155 $ 80,052
Other comprehensive income/(loss)      
Unrealized losses on available-for-sale securities, net of tax (314) (163)  
Foreign currency translation adjustment 649 245 (73)
Other comprehensive income/(loss) 335 82 (73)
Comprehensive income $ 27,534 $ 26,237 $ 79,979