STOCK COMPENSATION PLANS (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011		Dec. 31, 2010
Stock Options
Summary of stock option activity
Outstanding at beginning of year (in shares)	945,080
Exercised (in shares)	(161,432)
Forfeited (in shares)	(105,940)
Outstanding at end of year (in shares)	677,708	945,080
Vested or expected to vest at year-end (in shares)	676,258
Exercisable at year-end (in shares)	663,206
Outstanding at beginning of year, weighted average exercise price (in dollars per share)	$ 27.19
Exercised, weighted average exercise price (in dollars per share)	$ 16.45
Forfeited, weighted average exercise price (in dollars per share)	$ 35.73
Outstanding at end of year, weighted average exercise price (in dollars per share)	$ 28.41	$ 27.19
Vested or expected to vest at year-end, weighted average exercise price (in dollars per share)	$ 28.46
Exercisable at year-end, weighted average exercise price (in dollars per share)	$ 28.88
Outstanding at end of year, weighted average remaining term	1 year 5 months 26 days
Vested or expected to vest at year-end, weighted average remaining term	1 year 5 months 23 days
Exercisable at year-end, weighted average remaining term	1 year 5 months 12 days
Outstanding at end of year, aggregate intrinsic value	$ 412,000
Vested or expected to vest at year-end, aggregate intrinsic value	391,000
Exercisable at year-end, aggregate intrinsic value	199,000
Summary of unvested stock option activity
Unvested options at beginning of period, weighted average grant date fair value (in shares)	186,914
Vested, weighted average grant date fair value (in shares)	(163,758)
Forfeited, weighted average grant date fair value (in shares)	(8,654)
Unvested options at end of period, weighted average grant date fair value (in shares)	14,502	186,914
Unvested options at beginning of period (in dollars per share)	$ 4.77
Granted (in dollars per share)		$ 13.21	[1]
Vested (in dollars per share)	$ 4.48
Forfeited (in dollars per share)	$ 13.21
Unvested options at ending of period (in dollars per share)	$ 3.00	$ 4.77
Fair value assumptions under the Black-Scholes option pricing model
Fair value assumptions, method used		Black-Scholes option-pricing model
Expected term		4 years	[2]
Expected volatility (as a percent)		78.10%	[3]
Expected dividend yield (as a percent)		0.20%	[4]
Risk-free interest rate (as a percent)		1.60%	[5]
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	[1]
Total intrinsic value of options exercised	978,000	2,650,000		1,772,000
Total fair value of options vested	3,717,000	1,274,000		2,137,000
Total unrecognized stock compensation expense	17,000
Weighted average period to recognize unrecognized compensation cost	3 months 18 days
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
Common stock, shares authorized (in shares)	2,000,000
Shares sold to employees under purchase plan (in shares)	59,142	64,032
Stock Issued During Period, Value, Employee Stock Purchase Plan	$ 1,200,000	$ 1,000,000

[1] The Company did not issue any stock options during the year ended December 31, 2010.

[2] The expected term (estimated period of time outstanding) of stock options granted was estimated using the historical exercise behavior of employees.

[3] The expected volatility was based on historical volatility for a period equal to the stock option's expected term.

[4] The expected dividend yield is based on the Company's prevailing dividend rate at the time of grant.

[5] 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.