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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)

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