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Consolidated Balance Sheets (Parenthetical) - $ / shares
Jun. 30, 2018
Dec. 31, 2017
Common Stock, par value (in dollars per share) $ 0.001 $ 0.001
Common Stock, shares authorized (in shares) 200,000,000 200,000,000
Common Stock, shares issued (in shares) 67,968,000 68,236,000
Common Stock, shares outstanding (in shares) 67,968,000 68,236,000
Preferred Stock Series D, G and I    
Liquidation preference (in dollars per share) $ 25 $ 25
Preferred Stock Series J    
Liquidation preference (in dollars per share) $ 50.00 $ 50