SHARE-BASED COMPENSATION (Details) (USD $)	3 Months Ended	12 Months Ended
Mar. 31, 2013	Dec. 31, 2012
2007 EIP
SHARE-BASED COMPENSATION
Number of shares of common stock reserved for grants	691,051
Common stock issued under share-based compensation plan	175,669
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	10,053
Stock Options
SHARE-BASED COMPENSATION
Expiration term	10 years
Summary of the stock option activity
Outstanding at the beginning of the period (in shares)	286,455
Forfeited (in shares)	(37,580)
Outstanding at the end of the period (in shares)	248,875	286,455
Exercisable (in shares)	76,040
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 26.80
Forfeited (in dollars per share)	$ 15.94
Outstanding at the end of the period (in dollars per share)	$ 28.44	$ 26.80
Exercisable (in dollars per share)	$ 72.76
Stock options granted (in shares)	0	0
Stock Options \| 2007 EIP
SHARE-BASED COMPENSATION
Number of shares reserved	110,285
Stock Options \| 2012 EIP
SHARE-BASED COMPENSATION
Number of shares reserved	138,590
Stock Options \| Minimum
SHARE-BASED COMPENSATION
Vesting term	1 year
Stock Options \| Maximum
SHARE-BASED COMPENSATION
Vesting term	5 years
RSU \| 2007 EIP
SHARE-BASED COMPENSATION
Number of shares reserved	135,551
RSU \| 2012 EIP
SHARE-BASED COMPENSATION
Number of shares reserved	569,473
RSU \| Minimum
SHARE-BASED COMPENSATION
Vesting term	1 year
RSU \| Maximum
SHARE-BASED COMPENSATION
Vesting term	5 years

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

No definition available.

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Aggregate number of common shares reserved for future issuance.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

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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 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).

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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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-Name Accounting Standards Codification

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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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- Definition

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.

+ 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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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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No definition available.

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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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