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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Preferred Stock | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Noncontrolling Interest | Total
--- | --- | --- | --- | --- | --- | ---
Beginning balance, shares at Dec. 31, 2012 | 927,000 | 9,789,000 |  |  |  |
Beginning balance, value at Dec. 31, 2012 | $ 1 | $ 10 | $ 582,861 | $ (830,310) | $ 20,345 | $ 72,907
Stock-based compensation expense - restricted stock and options to employees and directors, net of cancellations, shares |  | 600,000 |  |  |  |
Stock-based compensation expense - restricted stock and options to employees and directors, net of cancellations, value |  | $ 1 | 1,696 |  |  | 1,697
Shares issued on convertible notes, shares issued |  | 4,446,000 |  |  |  |
Shares issued on convertible notes, value |  | $ 4 | 18,551 |  |  | 18,555
Shares issued on senior notes, shares issued |  | 500,000 |  |  |  |
Shares issued on senior notes, value |  |  | 2,000 |  |  | 2,000
Warrant exercises, shares issued |  | 280,000 |  |  |  |
Warrant exercises, value |  |  | 2,317 |  |  | 2,317
Shares issued as payment of prior unpaid Series B preferred dividends, shares |  | 511,000 |  |  |  |
Shares issued as payment of prior unpaid Series B preferred dividends, value |  | $ 1 | 2,192 |  |  | 2,193
Pension plan adjustment |  |  |  |  |  | 0
Purchases of interests in PE Op Co. |  |  | 11,940 |  | (14,281) | (2,341)
Preferred stock dividends |  |  |  | (1,265) |  | (1,265)
Net income (loss) |  |  |  | (781) | (381) | (1,162)
Ending balance, shares at Dec. 31, 2013 | 927,000 | 16,126,000 |  |  |  |
Ending balance, value at Dec. 31, 2013 | $ 1 | $ 16 | 621,557 | (532,356) | 5,683 | 94,901
Stock-based compensation expense - restricted stock and options to employees and directors, net of cancellations, shares |  | 90,000 |  |  |  |
Stock-based compensation expense - restricted stock and options to employees and directors, net of cancellations, value |  |  | 1,890 |  |  | 1,890
Issuance of common stock, shares |  | 1,750,000 |  |  |  |
Issuance of common stock, value |  | $ 2 | 26,071 |  |  | 26,073
Warrant exercises, shares issued |  | 6,413,000 |  |  |  |
Warrant exercises, value |  | $ 6 | 85,156 |  |  | 85,162
Shares issued as payment of prior unpaid Series B preferred dividends, shares |  | 120,000 |  |  |  |
Shares issued as payment of prior unpaid Series B preferred dividends, value |  | $ 1 | 1,462 |  |  | 1,463
Pension plan adjustment |  |  |  |  |  | 0
Purchases of interests in PE Op Co. |  |  | (79) |  | (5,921) | (6,000)
Tax impact of purchases of interests in PE Op Co. |  |  | (10,244) |  |  | (10,244)
Preferred stock dividends |  |  |  | (1,265) |  | (1,265)
Net income (loss) |  |  |  | 21,289 | 4,713 | 26,002
Ending balance, shares at Dec. 31, 2014 | 927,000 | 24,499,000 |  |  |  |
Ending balance, value at Dec. 31, 2014 | $ 1 | $ 25 | 725,813 | (512,332) | 4,475 | 217,982
Stock-based compensation expense - restricted stock and options to employees and directors, net of cancellations, shares |  | 216,000 |  |  |  |
Stock-based compensation expense - restricted stock and options to employees and directors, net of cancellations, value |  |  | 1,475 |  |  | 1,475
Warrant exercises, shares issued |  | 42,000 |  |  |  |
Warrant exercises, value |  |  | 440 |  |  | 440
Aventine acquisition, shares issued |  | 17,758,000 |  |  |  |
Aventine acquisition, value |  | $ 18 | 174,555 |  |  | 174,573
Pension plan adjustment |  |  |  |  |  | 1,040
Purchases of interests in PE Op Co. |  |  | 560 |  | (4,388) | (3,828)
Preferred stock dividends |  |  |  | (1,265) |  | (1,265)
Net income (loss) |  |  |  | (18,786) | (87) | (18,873)
Ending balance, shares at Dec. 31, 2015 | 927,000 | 42,515,000 |  |  |  |
Ending balance, value at Dec. 31, 2015 | $ 1 | $ 43 | $ 902,843 | $ (532,383) | $ 0 | $ 371,544

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