STOCK-BASED COMPENSATION (Details 4)	Dec. 31, 2012	Apr. 23, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)		3,000,000
Sub-limit for all types of stock awards included in available to be issued stock options (in shares)	1,402,605
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant or purchase (in shares)	1,912,021
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	6,793,276
2000 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant or purchase (in shares)	86,113
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	605,298
2003 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant or purchase (in shares)	22,009
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	876,315
2006 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant or purchase (in shares)	171,983
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	2,251,463
2009 Long Term Incentive Plan[Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant or purchase (in shares)	1,631,916
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	2,993,664
Stock Option Plan 1996 (Plan Expired) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant or purchase (in shares)	0
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	66,536
Long Term Incentive Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	6,726,740
Long Term Incentive Stock Option Plan Expired And Assumed [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant or purchase (in shares)	1,912,021
1997 Stock Plan For Non Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant or purchase (in shares)	220,712
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	596,922
Employee deferral Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant or purchase (in shares)	45,644
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	46,340
Stock Purchase Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant or purchase (in shares)	266,356
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	643,262
Committed shares reserved under the stock purchase plans for non employee Directors	377,609