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Consolidated Statements of Income (Parenthetical)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Income Statement [Abstract]      
Accumulated other comprehensive earnings reclassifications $ 38 $ 1,836 $ 189
Income tax expense from reclassification $ 13 $ 643 $ 66