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Consolidated Balance Sheets (Parenthetical) - $ / shares
shares in Thousands
Mar. 31, 2017
Dec. 31, 2016
Common Stock, par value (in dollars per share) $ 0.001 $ 0.001
Common Stock, shares authorized (in shares) 200,000 200,000
Common Stock, shares issued (in shares) 72,105 72,042
Common Stock, shares outstanding (in shares) 72,105 72,042
Series D, E, F, G and I Preferred Stock    
Liquidation preference (in dollars per share) $ 25 $ 25
Preferred Stock Series J    
Liquidation preference (in dollars per share) $ 50 $ 50.00