STOCK BENEFIT PLAN (Details)	12 Months Ended														12 Months Ended											12 Months Ended							12 Months Ended					12 Months Ended
	Dec. 31, 2012 Stock options	Dec. 31, 2012 Stock options Eligible employee	Dec. 31, 2011 Stock options Eligible employee	Dec. 31, 2010 Stock options Eligible employee	Dec. 31, 2010 Stock options Non-employee director	Dec. 31, 2012 Restricted stock	Dec. 31, 2012 Restricted stock Eligible employee	Dec. 31, 2011 Restricted stock Eligible employee	Dec. 31, 2010 Restricted stock Eligible employee	Dec. 31, 2012 Restricted stock Non-employee director	Dec. 31, 2011 Restricted stock Non-employee director	Dec. 31, 2010 Restricted stock Non-employee director	Dec. 31, 2012 2011 Plan	Dec. 31, 2011 2011 Plan	Dec. 31, 2012 2011 Plan Eligible employee	Dec. 31, 2012 2011 Plan Non-employee director	Dec. 31, 2012 2011 Plan Stock options Eligible employee	Dec. 31, 2012 2011 Plan Restricted stock Eligible employee	Dec. 31, 2012 2011 Plan Restricted stock Non-employee director	Dec. 31, 2012 2011 Plan Restricted Stock Units Eligible employee	Dec. 31, 2012 2011 Plan Restricted Stock Units with service condition Eligible employee	Dec. 31, 2012 2011 Plan Restricted Stock Units with market condition Eligible employee	Dec. 31, 2012 2011 Plan Stock option or stock appreciation right	Dec. 31, 2012 2011 Plan Full value awards	Dec. 31, 2012 2008 Plan	Dec. 31, 2012 2008 Plan Eligible employee	Dec. 31, 2012 2008 Plan Non-employee director	Dec. 31, 2012 2008 Plan Stock options	Dec. 31, 2012 2008 Plan Stock options Eligible employee	Dec. 31, 2012 2008 Plan Stock options Non-employee director	Dec. 31, 2010 2008 Plan Stock options Non-employee director	Dec. 31, 2009 2008 Plan Stock options Non-employee director	Dec. 31, 2012 2008 Plan Restricted stock	Dec. 31, 2012 2008 Plan Restricted stock Eligible employee	Dec. 31, 2012 2008 Plan Restricted stock Non-employee director	Dec. 31, 2010 2008 Plan Restricted stock Non-employee director	Dec. 31, 2009 2008 Plan Restricted stock Non-employee director	Dec. 31, 2012 1994 Plan Eligible employee	Dec. 31, 2012 1994 Plan Non-employee director	Dec. 31, 2012 1994 Plan Stock options Eligible employee	Dec. 31, 2012 1994 Plan Stock options Non-employee director	Dec. 31, 2012 2000 Plan Eligible employee	Dec. 31, 2012 2000 Plan Non-employee director	Dec. 31, 2012 2000 Plan Stock options Eligible employee	Dec. 31, 2012 2000 Plan Stock options Non-employee director	Dec. 31, 2012 2000 Plan Restricted stock Eligible employee	Dec. 31, 2012 2000 Plan Restricted stock Non-employee director	Dec. 31, 2012 2003 Plan Eligible employee	Dec. 31, 2012 2003 Plan Non-employee director	Dec. 31, 2012 2003 Plan Stock options Eligible employee	Dec. 31, 2012 2003 Plan Stock options Non-employee director	Dec. 31, 2012 2003 Plan Restricted stock Eligible employee	Dec. 31, 2012 2003 Plan Restricted stock Non-employee director	Dec. 31, 2012 2011 Plan and the 2008 Plan Stock options	Dec. 31, 2011 2011 Plan and the 2008 Plan Stock options	Dec. 31, 2010 2011 Plan and the 2008 Plan Stock options
Description of Stock Benefit Plans
Number of shares of common stock authorized for issuance														3,000,000											2,450,000
Number of shares available for grant													1,730,963												521,577
Number of shares deemed as an award for each share-based award granted																							1	4.28
Number of shares forfeited or cancelled returned to Plan and available for future grants													3,686
Number of shares reduced from shares available for awards for every one share granted																												1
Number of shares reduced from shares available for awards for every one share granted in first lot																																	1
Number of shares granted in first lot																																	250,000
Number of shares reduced from shares available for awards for every one share granted beyond first lot																																	3.5
Maximum number of shares to be issued to each individual under the plan																															6,000	6,000				2,000	2,000
Stock options, restricted stock and restricted stock unit awards granted
Stock Options Granted	219,799	219,799	166,810	352,454	48,490												386,609												1,354,837	134,146										1,542,381	153,654			2,101,220	163,760					2,737,142	217,723
Restricted Stock Granted						119,604	108,065	87,913	108,252	11,539	9,464	12,760						195,978	21,003	114,743	19,119	95,624												290,131	36,313											350,702	2,700					96,822	28,935
Total Granted															697,330	21,003										1,644,968	170,459											1,542,381	153,654			2,451,922	166,460					2,833,964	246,658
Available for Future Grant of Awards													1,730,963												521,577
Awards vested each year (as a percent)							25.00%	25.00%	25.00%																																													20.00%	20.00%	20.00%
Awards vested till fifth anniversary of grant date (as a percent)										100.00%																																												100.00%
Award expiration term																																																						10 years
Maximum exercise price as percentage of closing price of share of common stock																																																						100.00%
Vesting period							4 years