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STOCK-BASED COMPENSATION (Details 3) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Restricted and deferred stock units |  |
Shares |  |
Outstanding at the beginning of the period (in shares) | 716,907 |
Granted (in shares) | 89,637 |
Vested and released (in shares) | (3,975) |
Forfeited (in shares) | (2,338) |
Outstanding at the end of the period (in shares) | 800,231 |
Vested or expected to vest at the end of the period (in shares) | 769,748 |
Weighted Average Remaining Contractual Terms |  |
Outstanding at the end of the period | 1 year 3 months 18 days |
Vested or expected to vest at the end of the period | 1 year 3 months 18 days |
Weighted Average Grant Date Fair Value |  |
Outstanding at the beginning of the period (in dollars per share) | $ 27.86 |
Granted (in dollars per share) | $ 38.26 |
Vested and released (in dollars per share) | $ 17.62 |
Forfeited (in dollars per share) | $ 26.62 |
Outstanding at the end of the period (in dollars per share) | $ 29.08 |
Vested or expected to vest at the end of the period (in dollars per share) | $ 29.18 |
Aggregate Intrinsic Value |  |
Outstanding at the end of the period (in dollars) | $ 49.7 |
Vested or expected to vest at the end of the period (in dollars) | 47.8 |
Total intrinsic value of share awards vested (in dollars) | $ 0.2 | $ 0.1
Restricted and deferred stock units | Minimum |  |
Aggregate Intrinsic Value |  |
Vesting period | 1 year |
Restricted and deferred stock units | Maximum |  |
Aggregate Intrinsic Value |  |
Vesting period | 3 years |
PRSUs | Minimum |  |
Aggregate Intrinsic Value |  |
Percentage multiplied to target award for determining the number of shares subject to award | 0.00% |
PRSUs | Maximum |  |
Aggregate Intrinsic Value |  |
Percentage multiplied to target award for determining the number of shares subject to award | 150.00% |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) -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. + Details
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