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Condensed Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Allowances for Accounts Receivable (in dollars) $ 10,849 $ 1,973
Preferred stock-issued 0 0
Common stock par value $ 0.0001 $ 0.0001
Common stock, shares authorized 135,000,000 135,000,000
Common stock, shares issued 131,991,000 130,960,000
Common stock, shares outstanding 85,715,000 88,047,000
Treasury stock-shares at cost 46,276,000 42,913,000
Preferred Class A [Member]    
Preferred stock-par value $ 0.0001 $ 0.0001
Preferred stock- shares authorized 5,000,000 5,000,000
Preferred Class B [Member]    
Preferred stock-par value $ 0.0001 $ 0.0001
Preferred stock- shares authorized 60,000.0000 60