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Consolidated Statements of Stockholders' Equity (Parentheticals) - AOCI Attributable to Parent [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Unrealized gain (loss) on cash flow hedges, tax expense (benefit) $ (6) $ (43) $ 34
Pension liability adjustment, tax expense $ 21 $ 82 $ 237