STOCK-BASED COMPENSATION Stock options activity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement award vesting period	5 years
Share-based Compensation Arrangement by Share-based Payment Award [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award Grants in Period, Gross	567,900
Stock options outstanding - remaining contractual term	4 years 0 months 13 days	4 years 10 months 19 days
Stock options exercisable - remaining contractual term	4 years 0 months 13 days	4 years 0 months 13 days
Stock options outstanding	$ 0	$ 0
Stock options exercisable	$ 0	$ 0
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price fair market value of the underlying stock on the date of grant	100.00%
Share-based compensation arrangement expiration period	10 years
Share-based compensation arrangement award vesting period	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Outstanding, Weighted Average Exercise Price [Roll Forward]
Options outstanding at January 1, weighted average exercise price per share	$ 9.15	$ 11.21	$ 11.36
Granted, weighted average exercise price per share	$ 0.00	$ 0.00	$ 0.00
Expired, weighted average exercise price per share	$ 15.50	$ 14.99	$ 12.55
Options outstanding at December 31, weighted average exercise price per share	$ 8.78	$ 9.15	$ 11.21
Options exercisable at December 31, weighted average exercise price per share	$ 8.78	$ 10.47	$ 13.96
Share-based Compensation Arrangement by Share-based Payment Award [Roll Forward]
Options outstanding at January 1, number of options outstanding	800,350	1,238,650	1,396,350
Share-based Compensation Arrangement by Share-based Payment Award Grants in Period, Gross	0	0	0
Expired, number of options outstanding	(43,550)	(438,300)	(157,700)
Options outstanding at December 31, number of options outstanding	756,800	800,350	1,238,650
Options exercisable at December 31, number of options outstanding	756,800	600,350	838,650

Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period After Grant Date

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- Definition

Stock Option Award Exercise Price as a Percentage of the Fair Market Value of a Share of Common Stock

+ References

No definition available.

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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.

+ 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 (a)(1)

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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- Definition

Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ References

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-Publisher FASB

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-Topic 718

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-Paragraph 2

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- Definition

Weighted average price of options that were either forfeited or expired.

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- Definition

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

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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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- Definition

Number of options outstanding, including both vested and non-vested options.

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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