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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ / shares in Thousands, $ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accounts receivable, allowance for doubtful accounts $ 5,346 $ 4,606
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized (in shares) 200,000,000 100,000,000
Common stock, shares issued (in shares) 89,298,943 88,788,664
Common stock, shares outstanding (in shares) 82,022,500 83,253,588
Treasury stock (in shares) 7,276,443 5,535,076
Common Class A [Member]    
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized (in shares) 25,000,000 15,000,000
Common stock, shares issued (in shares) 8,569,149 8,349,069
Common stock, shares outstanding (in shares) 6,729,035 6,598,377
Treasury stock (in shares) 1,840,114 1,750,692