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STOCK-BASED COMPENSATION (Narrative) (Details) (USD $) | 12 Months Ended | 3 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended |  | 12 Months Ended
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Dec. 31, 2013 stock_based_compensation_plan | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Minimum | Dec. 31, 2013 Maximum | Dec. 31, 2013 Stock Options | Dec. 31, 2013 Restricted Stock, Performance Stock and Contract Stock | Dec. 31, 2012 Restricted Stock, Performance Stock and Contract Stock | Dec. 31, 2011 Restricted Stock, Performance Stock and Contract Stock | Dec. 31, 2013 Deferred Stock Units (SUs) Executive Chairman | Dec. 31, 2013 Restricted Stock Units (RSUs) | Dec. 31, 2013 Restricted Stock Units (RSUs) Non Former Chief Executive Officer | Oct. 31, 2010 Restricted Stock Units (RSUs) Chief Executive Officer Current Chief Executive Officer | Dec. 31, 2013 Restricted Stock Units (RSUs) Chief Executive Officer Current Chief Executive Officer | Dec. 31, 2013 2000 and 2001 Plan | May 31, 2010 2003 Plan | Jul. 31, 2008 2003 Plan | Dec. 31, 2013 2003 Plan | Dec. 31, 2013 Employee Stock Purchase Plan | Dec. 31, 2012 Employee Stock Purchase Plan | Dec. 31, 2011 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  | 6,500,000 | 1,500,000 |  |
Shares available for purchase (in shares) | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |
Shares issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,868 |  |  |  |  | 6,309 | 6,315 | 8,523
ESPP proceeds received |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000 | $ 200,000 | $ 200,000
Discount percentage available to participants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |
Number of stock-based compensation plans | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in authorized shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,750,000 | 750,000 |  |  |  |
Stock options exercisable for officers, directors and employees, vesting period, in years |  |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options exercisable for employees, expiration period, in years |  |  |  |  | 6 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options exercisable for directors, expiration period, in years |  |  |  | 6 years | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Dividend yield | 0.00% | 0.00% | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intrinsic value of options exercised in period |  |  | 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair value of options granted (in dollars per share) | $ 13.86 | $ 12.18 | $ 19.18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash received from option exercises | 2,300,000 | 700,000 | 3,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requisite service periods of performance stock, restricted stock and contract stock awards, in years |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized compensation costs related to unvested awards |  |  |  |  |  | 1,300,000 | 11,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average period for cost recognition, in years |  |  |  |  |  | 1 year | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense recognized | 10,393,000 | 9,051,000 | 26,805,000 |  |  |  | 9,200,000 | 7,700,000 | 24,500,000 |  |  |  | 1,500,000 |  |  |  |  |  |  |  |
Fair value of shares vested |  |  |  |  |  |  | $ 6,500,000 | $ 6,700,000 | $ 29,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Distribution of common stock to individual (in shares) |  |  |  |  |  |  |  |  |  | 1,670,000 |  |  |  |  |  |  |  |  |  |  |
Non issued vested restricted stock units (in shares) |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |  |  |  |  |  |  |

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