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(Parentheticals) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Assets [Abstract]    
Allowance for Doubtful Accounts Receivable, Current $ 3,404 $ 2,974
Liabilities and Equity [Abstract]    
Common Stock, No Par Value $ 0.00 $ 0.00
Common Stock, Shares Authorized 120,000,000 120,000,000
Treasury Stock, Shares 798,383 914,797
Common Stock, Shares, Issued 60,715,356 60,715,356