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BENEFIT PLANS (Details) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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| BENEFIT PLANS | |||
| Employee contribution limit per calendar year (as a percent of pre-tax earnings) | 50.00% | ||
| Employer match of employee contributions of each dollar | $ 0.50 | ||
| Employer contribution limit per calendar year (as a percent of compensation) | 3.00% | ||
| Matching contributions for United States 401 (k) defined contribution plan | 5,000,000 | 4,900,000 | 4,500,000 |
| Matching contributions for international employees defined contribution plan | $ 1,400,000 | $ 400,000 | $ 500,000 |