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Consolidated Statements of Stockholders' Equity - USD ($) | Total | Common Stock Shares [Member] | Non-Redeemable Preferred Stock [Member] | Capital in Excess of Par Value [Member] | Retained Earnings [Member] | Treasury Stock-Common [Member]
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2012 | $ 354,497,000 | $ 2,673,000 | $ 3,000,000 | $ 165,006,000 | $ 212,192,000 | $ (28,374,000)
Balance, shares at Dec. 31, 2012 |  | 26,731,000 |  |  |  |
Net income (loss) | 54,962,000 |  |  |  | 54,962,000 |
Dividends paid on convertible preferred stocks | (300,000) |  |  |  | (300,000) |
Stock-based compensation | 1,542,000 |  |  | 1,542,000 |  |
Exercise of stock options | 1,014,000 | $ 12,000 |  | 1,002,000 |  |
Exercise of stock options, shares |  | 115,000 |  |  |  |
Excess income tax benefit associated with stock-based compensation | 0 |  |  |  |  |
Balance at Dec. 31, 2013 | 411,715,000 | $ 2,685,000 | 3,000,000 | 167,550,000 | 266,854,000 | (28,374,000)
Balance, shares at Dec. 31, 2013 |  | 26,846,000 |  |  |  |
Net income (loss) | 19,634,000 |  |  |  | 19,634,000 |
Dividends paid on convertible preferred stocks | (300,000) |  |  |  | (300,000) |
Stock-based compensation | 1,925,000 |  |  | 1,925,000 |  |
Exercise of stock options | 1,074,000 | $ 12,000 |  | 1,062,000 |  |
Exercise of stock options, shares |  | 122,000 |  |  |  |
Excess income tax benefit associated with stock-based compensation | 0 |  |  |  |  |
Balance at Dec. 31, 2014 | 434,048,000 | $ 2,697,000 | 3,000,000 | 170,537,000 | 286,188,000 | (28,374,000)
Balance, shares at Dec. 31, 2014 |  | 26,968,000 |  |  |  |
Net income (loss) | (34,765,000) |  |  |  | (34,765,000) |
Dividends paid on convertible preferred stocks | (300,000) |  |  |  | (300,000) |
Dividend accrued on redeemable preferred stock | (2,287,000) |  |  |  | (2,287,000) |
Accretion of redeemable preferred stocks | (686,000) |  |  |  | (686,000) |
Stock-based compensation | 2,346,000 |  |  | 2,346,000 |  |
Exercise of stock options | $ 1,785,000 | $ 16,000 |  | 1,769,000 |  |
Exercise of stock options, shares | 159,348 | 160,000 |  |  |  |
Common stock issued for services | $ 156,000 |  |  | 156,000 |  |
Common stock issued for services, shares |  | 4,000 |  |  |  |
Restricted stock granted from treasury stock |  |  |  | (3,842,000) |  | 3,842,000
Common stock warrants issued | 22,300,000 |  |  | 22,300,000 |  |
Common stock warrants issuance costs | (1,613,000) |  |  | (1,613,000) |  |
Excess income tax benefit associated with stock-based compensation | 596,000 |  |  | 596,000 |  |
Balance at Dec. 31, 2015 | $ 421,580,000 | $ 2,713,000 | $ 3,000,000 | $ 192,249,000 | $ 248,150,000 | $ (24,532,000)
Balance, shares at Dec. 31, 2015 |  | 27,132,000 |  |  |  |

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