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STOCK-BASED COMPENSATION (Details 3) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Restricted Stock Awards | Minimum |  |  |  |
Summary of Stock-based Compensation Plans |  |  |  |
Vesting period |  |  | 3 years |
Restricted Stock Awards | Maximum |  |  |  |
Summary of Stock-based Compensation Plans |  |  |  |
Vesting period |  |  | 5 years |
Time-based restricted stock awards |  |  |  |
Summary of restricted stock awards activity |  |  |  |
Outstanding unvested at beginning of period (in shares) |  |  | 438,508 |
Granted (in shares) |  |  | 12,010 |
Vested (in shares) |  |  | (153,279) |
Forfeited (in shares) |  |  | (17,446) |
Outstanding unvested at end of period (in shares) | 279,793 |  | 279,793 |
Outstanding unvested at beginning of period, weighted average price (in dollars per share) |  |  | $ 17.79 |
Granted, weighted average price (in dollars per share) |  |  | $ 31.64 | $ 24.30
Vested, weighted average price (in dollars per share) |  |  | $ 11.18 |
Forfeited, weighted average price (in dollars per share) |  |  | $ 19.92 |
Outstanding unvested at end of period, weighted average price (in dollars per share) | $ 21.87 |  | $ 21.87 |
Total fair value of restricted stock awards vested | $ 587,000 | $ 772,000 | $ 5,300,000 | $ 17,100,000
Total unrecognized stock compensation expense | 2,600,000 |  | 2,600,000 |
Weighted average period to recognize unrecognized compensation cost |  |  | 1 year 7 months 6 days |
Performance-based restricted stock awards |  |  |  |
Summary of restricted stock awards activity |  |  |  |
Outstanding unvested at beginning of period (in shares) |  |  | 956,707 |
Granted (in shares) |  |  | 603,697 |
Vested (in shares) |  |  | (340,781) |
Forfeited (in shares) |  |  | (28,535) |
Outstanding unvested at end of period (in shares) | 1,191,088 |  | 1,191,088 |
Outstanding unvested at beginning of period, weighted average price (in dollars per share) |  |  | $ 23.74 |
Granted, weighted average price (in dollars per share) |  |  | $ 36.85 | $ 25.25
Vested, weighted average price (in dollars per share) |  |  | $ 23.52 |
Forfeited, weighted average price (in dollars per share) |  |  | $ 27.22 |
Outstanding unvested at end of period, weighted average price (in dollars per share) | $ 30.36 |  | $ 30.36 |
Total fair value of restricted stock awards vested | 0 | 0 | 12,600,000 | 4,300,000
Total unrecognized stock compensation expense | $ 28,800,000 |  | $ 28,800,000 |
Weighted average period to recognize unrecognized compensation cost |  |  | 2 years 3 months 18 days |

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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made 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 + Details
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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 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 + Details
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