Common Stock Common Stock (Tables)

12 Months Ended

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