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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data | Preferred Stock | Common Stock | Capital | Deficit | Interest | Total
--- | --- | --- | --- | --- | --- | ---
Beginning Balances, Amount at Dec. 31, 2011 | $ 1 | $ 6 | $ 556,952 | $ (509,985) | $ 72,290 | $ 119,264
Beginning Balances, Shares at Dec. 31, 2011 | 927 | 5,775 |  |  |  |
Stock-based compensation expense - restricted stock and options to employees and directors, net of cancellations, Amount |  |  | 806 |  |  | 806
Stock-based compensation expense - restricted stock and options to employees and directors, net of cancellations, Shares |  | (3) |  |  |  |
Shares issued on equity offerings, Amount |  | 4 | 15,856 |  |  | 15,860
Shares issued on equity offerings, Shares |  | 3,700 |  |  |  |
Shares issued as payment of prior unpaid Series B preferred dividends, Amount |  |  | 1,462 |  |  | 1,462
Shares issued as payment of prior unpaid Series B preferred dividends, Shares |  | 302 |  |  |  |
Warrant exercises, Amount |  |  | 139 |  |  | 139
Warrant exercises, Shares |  | 15 |  |  |  |
Purchase of interests in New PE Holdco |  |  | 7,646 |  | (27,647) | (20,001)
Preferred stock dividends |  |  |  | (1,268) |  | (1,268)
Net income (loss) |  |  |  | (19,057) | (24,298) | (43,355)
Ending Balances, Amount at Dec. 31, 2012 | 1 | 10 | 582,861 | (530,310) | 20,345 | 72,907
Ending Balances, Shares at Dec. 31, 2012 | 927 | 9,789 |  |  |  |
Stock-based compensation expense - restricted stock and options to employees and directors, net of cancellations, Amount |  | 1 | 1,696 |  |  | 1,697
Stock-based compensation expense - restricted stock and options to employees and directors, net of cancellations, Shares |  | 600 |  |  |  |
Shares issued on Convertible Notes, Amount |  | 4 | 18,551 |  |  | 18,555
Shares issued on Convertible Notes, Shares |  | 4,446 |  |  |  |
Shares issued on senior notes, Amount |  |  | 2,000 |  |  | 2,000
Shares issued on senior notes, Shares |  | 500 |  |  |  |
Shares issued as payment of prior unpaid Series B preferred dividends, Amount |  | 1 | 2,192 |  |  | 2,193
Shares issued as payment of prior unpaid Series B preferred dividends, Shares |  | 511 |  |  |  |
Warrant exercises, Amount |  |  | 2,317 |  |  | 2,317
Warrant exercises, Shares |  | 280 |  |  |  |
Purchase of interests in New PE Holdco |  |  | 11,940 |  | (14,281) | (2,341)
Preferred stock dividends |  |  |  | (1,265) |  | (1,265)
Net income (loss) |  |  |  | (781) | (381) | (1,162)
Ending Balances, Amount at Dec. 31, 2013 | $ 1 | $ 16 | $ 621,557 | $ (532,356) | $ 5,683 | $ 94,901
Ending Balances, Shares at Dec. 31, 2013 | 927 | 16,126 |  |  |  |

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