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STOCK-BASED COMPENSATION (Details 5) (USD $)
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12 Months Ended |
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Dec. 31, 2012
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| Shares | |
| Nonvested at the beginning of the period (in shares) | 798,710 |
| Granted (in shares) | 409,351 |
| Vested (in shares) | (487,515) |
| Forfeited and expired (in shares) | (24,455) |
| Nonvested at the end of the period (in shares) | 696,091 |
| Weighted Average Grant Date Fair Value | |
| Nonvested at the beginning of the period (in dollars per share) | $ 16.81 |
| Granted (in dollars per share) | $ 30.18 |
| Vested (in dollars per share) | $ 11.76 |
| Forfeited and expired (in dollars per share) | $ 25.86 |
| Nonvested at the end of the period (in dollars per share) | $ 27.90 |
| X | ||||||||||
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- Definition
The number of equity-based payment instruments that were forfeited and expired during the reporting period. No definition available.
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- Definition
The weighted average fair value as of the grant date of equity-based award plans that were forfeited and expired during the reporting period. No definition available.
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- Definition
The number of grants made during the period on equity-based payment instruments. No definition available.
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- Definition
The weighted average fair value at grant date for nonvested equity-based awards issued during the period. No definition available.
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- Definition
The number of non-vested equity-based payment instruments that validly exist and are outstanding as of the balance sheet date. No definition available.
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- Details
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- Definition
The weighted average grant date fair value of nonvested equity-based awards that are outstanding as of the balance sheet date. No definition available.
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- Details
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| X | ||||||||||
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- Definition
The number of equity-based payment instruments that vested during the reporting period. No definition available.
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| X | ||||||||||
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- Definition
The weighted average fair value at grant date pertaining to an award for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments or cash in accordance with terms of the arrangement. No definition available.
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