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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ / shares in Thousands, $ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accounts receivable, allowance for doubtful accounts $ 11,000 $ 5,000
Series A Perpetual Preferred Stock, par value (in dollars per share) $ 0 $ 0
Series A Perpetual Preferred Stock, shares authorized (in shares) 1,500,000 1,500,000
Series A Perpetual Preferred Stock, shares issued (in shares) 650,000 0
Series A Perpetual Preferred Stock, shares outstanding (in shares) 650,000 0
Series A Perpetual Preferred Stock, liquidation value $ 650,000 $ 0
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized (in shares) 200,000,000 200,000,000
Common stock, shares issued (in shares) 101,746,860 89,298,943
Common stock, shares outstanding (in shares) 92,685,362 82,022,500
Treasury stock (in shares) 9,088,498 7,276,443
Common Class A [Member]    
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized (in shares) 25,000,000 25,000,000
Common stock, shares issued (in shares) 8,768,959 8,569,149
Common stock, shares outstanding (in shares) 6,881,192 6,729,035
Treasury stock (in shares) 1,887,767 1,840,114