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Consolidated Balance Sheets (Parentheticals) - $ / shares
Jun. 30, 2019
Dec. 31, 2018
Common Stock    
Common Stock, Par Value (in usd per share) $ 0.01 $ 0.01
Common Stock, Shares Authorized (in shares) 500,000,000 500,000,000
Common Stock, Issued (in shares) 187,559,362 198,663,342
Common Stock, Outstanding (in shares) 187,559,362 198,663,342
Preferred Stock    
Preferred Stock, Authorized (in shares) 15,000,000 15,000,000
Preferred Stock, Issued (in shares) 0 0
Preferred Stock, Outstanding (in shares) 0 0