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Consolidated Statements of Stockholders' Equity (Parentheticals) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
AOCI Attributable to Parent [Member]      
Other comprehensive (loss), tax     $ (668)
Other comprehensive (loss), tax $ 1,995 $ 1,326  
Other comprehensive (loss), tax $ (687) $ 1,390 $ (588)