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Consolidated Balance Sheets (Parenthetical) - $ / shares | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
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) | 72,042,000 | 81,109,000
Common stock, shares outstanding (in shares) | 72,042,000 | 81,109,000
Series D, E, F, G and I Preferred Stock |  |
Liquidation preference (in dollars per share) | $ 25 | $ 25
Series J convertible perpetual preferred stock |  |
Liquidation preference (in dollars per share) | $ 50.00 | $ 50

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