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Common Stock Common Stock (Tables) | 12 Months Ended
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Dec. 31, 2013
Common Stock [Abstract] |
Schedule of reconciliation of changes in common shares issued | A reconciliation of the changes in common shares issued is as follows:
| Year ended December 31,
| 2013 |  | 2012
Shares issued at the beginning of the year | 53,123,978 |  |  | 51,957,652 |
Issued to purchase Florida Chemical Company | 3,284,180 |  |  | — |
Issued upon exercise of warrants | 267,000 |  |  | 348,350 |
Issued from restricted stock units | 217,089 |  |  | — |
Issued as restricted stock award grants | 802,164 |  |  | 750,476 |
Issued upon exercise of stock options | 571,500 |  |  | 67,500 |
Shares issued at the end of the year | 58,265,911 |  |  | 53,123,978 |
Schedule of assumptions used in the Black-Scholes model for stock options granted | Assumptions used in the Black-Scholes option pricing model for stock options granted in 2011 are as follows:
|  | Year ended December 31, 2011
Risk-free interest rate |  | .94%-1.825% |
Expected volatility of common stock |  | 67.7%-70.3% |
Expected life of options in years |  | 3.50*-4.00 |
Dividend yield |  | — | %
Vesting period in years |  | 3.5-4.0 |
*Grants were made to an optionee for whom the Company was able to reasonably estimate the expected life of the award.
Schedule of stock option activity | Stock option activity for the year ended December 31, 2013 is as follows:
Options |  | Shares |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value
Outstanding as of January 1, 2013 |  | 2,457,586 |  |  | $ | 5.65 |  |  |  |  |
Exercised |  | (571,500 | ) |  | 7.70 |  |  |  |  |
Forfeited |  | (5,000 | ) |  | 1.38 |  |  |  |  |
Expired |  | (17,044 | ) |  | 22.40 |  |  |  |  |
Outstanding as of December 31, 2013 |  | 1,864,042 |  |  | $ | 4.95 |  |  | 6.26 |  | $ | 28,253,321 |
Vested or expected to vest at |  |  |  |  |  |  |  |
December 31, 2013 |  | 1,862,960 |  |  | $ | 4.95 |  |  | 6.26 |  | $ | 28,216,770 |
Options exercisable as of |  |  |  |  |  |  |  |
December 31, 2013 |  | 1,836,942 |  |  | $ | 4.98 |  |  | 6.25 |  | $ | 27,763,907 |
Schedule of restricted stock activity | estricted stock share activity for the year ended December 31, 2013 is as follows:
Restricted Stock Shares |  | Shares |  | Weighted- Average Fair Value at Date of Grant
Non-vested at January 1, 2013 |  | 1,324,290 |  |  | $ | 9.15 |
Granted |  | 629,135 |  |  | 15.17 |
RSAs converted from 2012 restricted stock units |  | 173,029 |  |  | 11.04 |
Vested |  | (943,447 | ) |  | 8.87 |
Forfeited |  | (115,352 | ) |  | 13.50 |
Non-vested at December 31, 2013 |  | 1,067,655 |  |  | $ | 12.78 |
Schedule of restricted stock unit activity | estricted stock unit share activity for the year ended December 31, 2013 is as follows:
Restricted Stock Unit Shares |  | Shares |  | Weighted- Average Fair Value at Date of Grant
RSU share equivalents at January 1, 2013 |  | 390,118 |  |  | $ | 11.04 |
Issued as shares in 2013 |  | (217,089 | ) |  | 11.04 |
2012 RSUs converted to RSAs in 2013 |  | (173,029 | ) |  | 11.04 |
Share equivalents earned in 2013 |  | 175,576 |  |  | 16.35 |
RSU share equivalents at December 31, 2013 |  | 175,576 |  |  | $ | 16.35 |

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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