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STOCK-BASED COMPENSATION (Details) (USD $) | 3 Months Ended |  |  |  | 3 Months Ended |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2012 | Mar. 31, 2012 Stock Options anniversary Y | Mar. 31, 2012 Restricted Stock, Restricted Stock Units and Cash Settled Restricted Stock Units anniversary | Mar. 31, 2012 Partnership Phantom Units | May 31, 2011 Stock Incentive Plan | Aug. 31, 2007 Stock Incentive Plan | Mar. 31, 2012 Stock Incentive Plan Stock Options | Mar. 31, 2012 Stock Incentive Plan Restricted Stock, Restricted Stock Units and Cash Settled Restricted Stock Units | Mar. 31, 2012 Employee Stock Purchase Plan | May 31, 2011 Employee Stock Purchase Plan | Mar. 31, 2012 Employee Stock Purchase Plan Minimum | Mar. 31, 2012 Employee Stock Purchase Plan Maximum
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized and reserved for issuance |  |  |  | 1,035,378 | 12,500,000 | 9,750,000 |  |  |  | 1,000,000 |  |
Number of shares counted by each award |  |  |  |  |  |  | 1 | 2 |  |  |  |
Expiration period (in years) |  | 7 years |  |  |  |  |  |  |  |  |  |
Vesting of awards per anniversary or year (as a percent) |  | 33.33% | 33.33% |  |  |  |  |  |  |  |  |
Number of anniversaries of grant date on which awards will vest |  | 3 | 3 |  |  |  |  |  |  |  |  |
Weighted average fair value at date of grant (in dollars per share) |  | $ 5.74 |  |  |  |  |  |  |  |  |  |
Weighted average assumptions |  |  |  |  |  |  |  |  |  |  |  |
Expected life in years |  | 4.5 |  |  |  |  |  |  |  |  |  |
Risk-free interest rate (as a percent) |  | 0.78% |  |  |  |  |  |  |  |  |  |
Volatility (as a percent) |  | 47.96% |  |  |  |  |  |  |  |  |  |
Dividend yield (as a percent) |  | 0.00% |  |  |  |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding at the beginning of the period (in shares) |  | 3,271,000 |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 153,000 |  |  |  |  |  |  |  |  |  |
Cancelled (in shares) |  | (365,000) |  |  |  |  |  |  |  |  |  |
Options outstanding at the end of the period (in shares) |  | 3,059,000 |  |  |  |  |  |  |  |  |  |
Options exercisable at the end of the period (in shares) |  | 2,056,000 |  |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding at the beginning of the period (in dollars per share) |  | $ 27.39 |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) |  | $ 14.36 |  |  |  |  |  |  |  |  |  |
Cancelled (in dollars per share) |  | $ 22.65 |  |  |  |  |  |  |  |  |  |
Options outstanding at end of period, (in dollars per share) |  | $ 27.30 |  |  |  |  |  |  |  |  |  |
Options exercisable at the end of period (in dollars per share) |  | $ 33.38 |  |  |  |  |  |  |  |  |  |
Weighted Average Remaining Life |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the period (in years) |  | 4 years 11 months |  |  |  |  |  |  |  |  |  |
Exercisable at the end of the period (in years) |  | 3 years 6 months |  |  |  |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the period |  | $ 1,637,000 |  |  |  |  |  |  |  |  |  |
Unrecognized compensation |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost related to unvested stock options |  | 4,700,000 |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost is expected to be recognized over a weighted average period (in years) |  | 2 years 4 months | 2 years 6 months | 2 years 5 months |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |  |  |  |
Non-vested awards at the beginning of the period (in shares) |  |  | 1,670,000 | 75,267,000 |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 1,212,000 | 17,814,000 |  |  |  |  |  |  |  |
Vested (in shares) |  |  | (598,000) | (29,950,000) |  |  |  |  |  |  |  |
Cancelled (in shares) |  |  | (50,000) |  |  |  |  |  |  |  |  |
Non-vested awards at the end of the period (in shares) |  |  | 2,234,000 | 63,131,000 |  |  |  |  |  |  |  |
Weighted Average Grant-Date Fair Value Per Share |  |  |  |  |  |  |  |  |  |  |  |
Non-vested awards at the beginning of the period (in dollars per share) |  |  | $ 19.49 | $ 21.45 |  |  |  |  |  |  |  |
Granted (in dollars per share) |  |  | $ 14.31 | $ 23.70 |  |  |  |  |  |  |  |
Vested (in dollars per share) |  |  | $ 20.54 | $ 17.53 |  |  |  |  |  |  |  |
Cancelled (in dollars per share) |  |  | $ 22.02 |  |  |  |  |  |  |  |  |
Non-vested awards at the end of the period (in dollars per share) |  |  | $ 16.34 | $ 23.94 |  |  |  |  |  |  |  |
Unrecognized compensation cost related to unvested restricted stock and restricted stock units |  |  | 31,800,000 | 1,300,000 |  |  |  |  |  |  |  |
Aggregate Share Based Compensation Disclosures |  |  |  |  |  |  |  |  |  |  |  |
Minimum number of full trading days | 2 days |  |  |  |  |  |  |  |  |  |  |
Employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |
Amount for Employee stock purchase plan |  |  |  |  |  |  |  |  | $ 25,000 |  |  |
Percentage of Employee stock purchase plan |  |  |  |  |  |  |  |  | 10.00% |  |  |
Purchase price as a percent of the fair market value |  |  |  |  |  |  |  |  |  |  | 85.00% | 100.00%
Shares remained available for purchase under ESPP |  |  |  |  |  |  |  |  | 437,332 |  |  |
Employee Stock Purchase plan discount from market price (as a percent) |  |  |  |  |  |  |  |  | 5.00% |  |  |

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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(b) -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(d) -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 65 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -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 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 maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(c), d(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. Reference 2: 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 + 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 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. Reference 2: 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 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(f) -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 2: 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 Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(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 2: 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 number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options. + 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)(i)-(ii) -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)(a) -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(1)(b) -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 4: 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 beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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