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STOCK-BASED COMPENSATION (Details 2) (Stock Options, USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Summary of stock option activity |  |
Outstanding at beginning of period (in shares) | 677,708 |
Exercised (in shares) | (23,584) |
Expired (in shares) | (141,291) |
Outstanding at end of period (in shares) | 512,833 |
Vested or expected to vest at end of period (in shares) | 512,833 |
Exercisable at end of period (in shares) | 512,833 |
Outstanding at beginning of period, weighted average exercise price (in dollars per share) | $ 28.41 |
Exercised, weighted average exercise price (in dollars per share) | $ 18.73 |
Expired, weighted average exercise price (in dollars per share) | $ 36.90 |
Outstanding at end of period, weighted average exercise price (in dollars per share) | $ 26.52 |
Vested or expected to vest at end of period, weighted average exercise price (in dollars per share) | $ 26.52 |
Exercisable at end of period, weighted average exercise price (in dollars per share) | $ 26.52 |
Outstanding at end of period, weighted average remaining term | 1 year 6 months 22 days |
Vested or expected to vest at end of period, weighted average remaining term | 1 year 6 months 22 days |
Exercisable at end of period, weighted average remaining term | 1 year 6 months 22 days |
Outstanding at end of period, aggregate intrinsic value | $ 1,786 |
Vested or expected to vest at end of period, aggregate intrinsic value | 1,786 |
Exercisable at end of period, aggregate intrinsic value | 1,786 |
Summary of unvested stock option activity |  |
Unvested options at beginning of period, weighted average grant date fair value (in shares) | 14,502 |
Vested, weighted average grant date fair value (in shares) | (14,502) |
Unvested options at beginning of period (in dollars per share) | $ 3.00 |
Vested (in dollars per share) | $ 3.00 |
Share based compensation plan, additional disclosures |  |
Total intrinsic value of options exercised | 127 | 575
Total fair value of options vested | $ 363 | $ 3,001
Minimum |  |
Stock Options |  |
Vesting period | 3 years |
Contractual term of stock option grants | 7 years |
Maximum |  |
Stock Options |  |
Vesting period | 4 years |
Contractual term of stock option grants | 10 years |

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- Definition The total fair value of stock options 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 the terms of the arrangement. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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)(1)(iii) -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 b(1)(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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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the 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 (d)(2) -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(2) -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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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(1)(iv)(4) -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 b(1)(g) -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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