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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statement of Comprehensive Income [Abstract]        
Net income $ 12,105 $ 3,651 $ 18,985 $ 15,723
Other comprehensive income        
Unrealized losses on available-for-sale securities, net of tax (31)   (134)  
Foreign currency translation adjustment 194 547 439 920
Other comprehensive income 163 547 305 920
Comprehensive income $ 12,268 $ 4,198 $ 19,290 $ 16,643