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Income Taxes U.S. and foreign components of income before income tax expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
U.S $ 43,677 $ 72,371 $ 68,063
Foreign 7,362 (14,179) (12,501)
Income before taxes $ 51,039 $ 58,192 $ 55,562