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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Net income $ 153,206 $ 143,892 $ 60,127
Other comprehensive income:      
Currency translation adjustment (1,240) 7,929 (41,396)
Comprehensive income $ 151,966 $ 151,821 $ 18,731