COMMITMENTS AND CONTINGENCIES (Details) (USD $)	3 Months Ended
Mar. 31, 2013
Exchange rate
Percentage of appreciation or depreciation of Russian ruble against US dollar	(2.00%)
Change in average percentage of the average value of the Russian Ruble against the US Dollar against corresponding prior period	1.00%
Foreign exchange forward contracts
Exchange rate
Notional amount of foreign exchange forward contracts designated as fair value hedges	26,000,000
Notional amount of short-term foreign exchange forward contracts not designated as fair value hedges	72,000,000
Effect of derivative financial instruments designated as fair value hedges on consolidated statement of income
Foreign currency losses designated as hedging instruments	108,000
Effect of outstanding economic hedges
Foreign currency gains not designated as hedging instruments	1,121,000

Represents the average percentage of the average value of the functional currency against the reporting currency.

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- Definition

Represents the percentage of appreciation or depreciation of the functional currency against the reporting currency.

+ References

No definition available.

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Amount of gain (loss) from the increase (decrease) in fair value of foreign currency derivatives and nonderivative instruments designated as fair value hedging instruments which were recognized in earnings, net of offsets by the gain (loss) on the hedged item to the extent that the fair value hedge was determined to be effective.

+ References

No definition available.

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Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Aggregate notional amount of all foreign currency derivatives not designated as hedging instruments. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

+ References

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- Definition

Aggregate notional amount of all foreign currency derivatives designated as hedging instruments in fair value hedges. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

+ References

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