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STOCK COMPENSATION PLANS (Details 2) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Stock purchase plan |  |  |  |
Compensation expense recognized | $ 13,500,000 | $ 12,700,000 | $ 13,500,000 |
Stock Options |  |  |  |
Summary of stock option activity |  |  |  |
Outstanding at beginning of year (in shares) | 677,708 |  |  |
Exercised (in shares) | (91,540) |  |  |
Forfeited (in shares) | (179,437) |  |  |
Outstanding at end of year (in shares) | 406,731 | 677,708 |  |
Vested or expected to vest at year-end (in shares) | 406,731 |  |  |
Exercisable at year-end (in shares) | 406,731 |  |  |
Outstanding at beginning of year, weighted average exercise price (in dollars per share) | $ 28.41 |  |  |
Exercised, weighted average exercise price (in dollars per share) | $ 18.35 |  |  |
Forfeited, weighted average exercise price (in dollars per share) | $ 37.36 |  |  |
Outstanding at end of year, weighted average exercise price (in dollars per share) | $ 26.72 | $ 28.41 |  |
Vested or expected to vest at year-end, weighted average exercise price (in dollars per share) | $ 26.72 |  |  |
Exercisable at year-end, weighted average exercise price (in dollars per share) | $ 26.72 |  |  |
Outstanding at end of year, weighted average remaining term | 9 months 29 days |  |  |
Vested or expected to vest at year-end, weighted average remaining term | 9 months 29 days |  |  |
Exercisable at year-end, weighted average remaining term | 9 months 29 days |  |  |
Outstanding at end of year, aggregate intrinsic value | 3,848,000 |  |  |
Vested or expected to vest at year-end, aggregate intrinsic value | 3,848,000 |  |  |
Exercisable at year-end, aggregate intrinsic value | 3,848,000 |  |  |
Summary of unvested stock option activity |  |  |  |
Unvested options at beginning of year (in shares) | 14,502 |  |  |
Vested (in shares) | (14,502) |  |  |
Unvested options at ending of year (in shares) |  | 14,502 |  |
Unvested options at beginning of year, weighted average grant date fair value (in dollars per share) | $ 3.00 |  |  |
Vested, weighted average grant date fair value (in dollars per share) | $ 3.00 |  |  |
Unvested options at ending of year, weighted average grant date fair value (in dollars per share) |  | $ 3.00 |  |
Fair value assumptions under the Black-Scholes option pricing model |  |  |  |
Fair value assumptions, method used | Black-Scholes option-pricing model |  | Black-Scholes option-pricing model |
Expected term |  |  | 4 years | [1]
Expected volatility (as a percent) |  |  | 78.10% | [2]
Expected dividend yield (as a percent) |  |  | 0.20% | [3]
Risk-free interest rate (as a percent) |  |  | 1.60% | [4]
Share based compensation plan, additional disclosures |  |  |  |
Weighted average grant date fair value of stock options granted during the year (in dollars per share) |  |  | $ 13.21 | [5]
Total intrinsic value of options exercised | 926,000 | 978,000 | 2,650,000 |
Total fair value of options vested | 363,000 | 3,717,000 | 1,274,000 |
Stock Options | Minimum |  |  |  |
Stock Options |  |  |  |
Vesting period | 3 years |  |  |
Contractual term of stock option grants | 7 years |  |  |
Stock Options | Maximum |  |  |  |
Stock Options |  |  |  |
Vesting period | 4 years |  |  |
Contractual term of stock option grants | 10 years |  |  |
Stock Purchase Plan |  |  |  |
Stock purchase plan |  |  |  |
Purchase price of shares in terms compared to market price per share (as a percent) | 90.00% |  |  |
Value of shares sold to employees under purchase plan | 25,000 |  |  |
Compensation expense recognized | 0 |  |  |
Common stock, shares authorized (in shares) | 2,000,000 |  |  |
Shares sold to employees under purchase plan (in shares) | 53,015 | 59,142 |  |
Stock Issued During Period, Value, Employee Stock Purchase Plan | $ 1,400,000 | $ 1,200,000 |  |
[1] | The expected term (estimated period of time outstanding) of stock options granted was estimated using the historical exercise behavior of employees.
[2] | The expected volatility was based on historical volatility for a period equal to the stock option's expected term.
[3] | The expected dividend yield is based on the Company's prevailing dividend rate at the time of grant.
[4] | The risk-free rate is based on the U.S. Treasury strips in effect at the time of grant equal to the stock option's expected term.
[5] | The Company did not issue any stock options during the years ended December 31, 2013 and December 31, 2012.

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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 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 For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset or liability could be bought or incurred or sold or settled in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected. + 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 (f)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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