SHARE-BASED COMPENSATION (Details) (USD $)	3 Months Ended
Mar. 31, 2015
2007 EIP
SHARE-BASED COMPENSATION
Number of shares of common stock reserved for grants	691,051
Common stock issued under share-based compensation plan	247,001
2012 EIP
SHARE-BASED COMPENSATION
Number of shares of common stock reserved for grants	1,200,000
Common stock issued under share-based compensation plan	371,977
Stock Options
SHARE-BASED COMPENSATION
Expiration term	10 years
Summary of the stock option activity
Outstanding at the beginning of the period (in shares)	158,718
Granted (in shares)	0
Outstanding at the end of the period (in shares)	158,718
Exercisable (in shares)	107,811
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 16.64
Outstanding at the end of the period (in dollars per share)	$ 16.64
Exercisable (in dollars per share)	$ 22.85
Stock Options \| 2007 EIP
SHARE-BASED COMPENSATION
Number of shares reserved	57,783
Stock Options \| 2012 EIP
SHARE-BASED COMPENSATION
Number of shares reserved	100,935
Stock Options \| Minimum
SHARE-BASED COMPENSATION
Vesting term	1 year
Stock Options \| Maximum
SHARE-BASED COMPENSATION
Vesting term	5 years
Restricted stock unit (RSU) \| 2007 EIP
SHARE-BASED COMPENSATION
Number of shares reserved	9,943
Restricted stock unit (RSU) \| 2012 EIP
SHARE-BASED COMPENSATION
Number of shares reserved	522,944
Restricted stock unit (RSU) \| Minimum
SHARE-BASED COMPENSATION
Vesting term	1 year
Restricted stock unit (RSU) \| Maximum
SHARE-BASED COMPENSATION
Vesting term	5 years

Aggregate number of common shares reserved for future issuance.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

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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

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

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

-Publisher FASB

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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.

+ References

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-Publisher FASB

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

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No definition available.

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

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

+ References

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-Publisher FASB

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Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.

+ References

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-Publisher FASB

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