STOCK PLANS (Details 1) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011
Stock options vested and expected to vest:
Number (in shares)	211,469	257,827
Weighted average exercise price per share (in dollars per share)	$ 71.01	$ 69.39
Aggregate intrinsic value	$ 527	$ 400
Weighted average contractual term of options	4 years 2 months 12 days	4 years 7 months 6 days
Stock options vested and currently exercisable:
Number (in shares)	211,394	257,206
Weighted average exercise price per share (in dollars per share)	$ 71.03	$ 69.59
Aggregate intrinsic value	527	397
Weighted average contractual term of options	4 years 2 months 12 days	4 years 7 months 6 days
Unearned compensation related to stock options	$ 0	$ 48

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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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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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.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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