LONG TERM INCENTIVE PLAN & STOCK OPTIONS (Details 3) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Options
NUMBER OF UNVESTED OPTIONS
Beginning of the period (in shares)	1,579,000	1,529,333	1,609,111	1,305,000
Granted (in shares)	871,000	839,000	938,000
Forfeited (in shares)	(140,334)	(229,998)	(12,000)
Vested (in shares)	(680,999)	(688,780)	(621,889)
End of the period (in shares)	1,579,000	1,529,333	1,609,111	1,305,000
WEIGHTED AVERAGE FAIR MARKET VALUE AT GRANT DATE
Granted (in dollars per share)	$ 5.93	$ 5.06	$ 4.07
Assumptions used to estimate the fair market value of stock options granted
Expected option life	6 years	6 years	6 years
Dividend yield (as a percent)	0.00%	0.00%	0.00%
Additional disclosures
Expiration term	10 years
Vesting period	3 years
Options \| Minimum
Assumptions used to estimate the fair market value of stock options granted
Volatility of share price (as a percent)	64.00%	63.00%	65.00%
Risk free interest rate (as a percent)	0.80%	1.10%	1.45%
Options \| Maximum
Assumptions used to estimate the fair market value of stock options granted
Volatility of share price (as a percent)	65.00%	64.00%	67.00%
Risk free interest rate (as a percent)	1.20%	2.60%	2.80%
LTIP
Additional disclosures
Remaining number of common shares available for equity awards	1,284,665
LTIP \| Options
Additional disclosures
Expiration term	10 years
Vesting period	3 years
Compensation expense (in dollars)	$ 3,903,795	$ 3,469,703	$ 3,048,750
Unrecorded stock-based compensation expense (in dollars)	$ 4,963,000
Period for amortizing unrecognized compensation cost to expense	3 years

The number of stock options that were forfeited during the reporting period.

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The number of non-vested stock options that validly exist and are outstanding as of the balance sheet date.

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The number of stock options that vested during the reporting period.

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No definition available.

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The period of time from the grant date until the time at which the share-based option award expires.

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No definition available.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Aggregate unrecognized cost of option awards made to employees under a stock option plan or plans, that have yet to vest.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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