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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 42,151 | $ 33,484 | $ 11,147
Other comprehensive income (loss) - Currency translation adjustment | (3,292) | (4,468) | 1,906
Comprehensive income | $ 38,859 | $ 29,016 | $ 13,053

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