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Consolidated Statements of Stockholders' Equity (Parentheticals) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]      
Deferred tax on pension liability $ 11,157
Treasury Stock, Shares, Acquired 283,343 82,100 680,813