STOCK-BASED COMPENSATION Exercise Price Range (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares, options outstanding	2,219,625
Averaged remaining contractual life (years), options outstanding	4 years 0 months 22 days
Aggregate intrinsic value (US$), options outstanding	$ 0
Weighted average exercise price (US$), options outstanding	$ 31.51
Shares, options exercisable	1,631,500
Average remaining contractual life (years), options exercisable	3 years 5 months 5 days
Aggregate intrinsic value (US$), options exercisable	0
Weighted average exercise price (US$), options exercisable	$ 34.26
$0.01 - 20.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower	$ 0.01
Range of exercise prices, upper	$ 20
Shares, options outstanding	322,000
Averaged remaining contractual life (years), options outstanding	1 year 10 months 13 days
Aggregate intrinsic value (US$), options outstanding	0
Weighted average exercise price (US$), options outstanding	$ 16.77
Shares, options exercisable	322,000
Average remaining contractual life (years), options exercisable	1 year 10 months 13 days
Aggregate intrinsic value (US$), options exercisable	0
Weighted average exercise price (US$), options exercisable	$ 16.77
$20.01 - 40.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower	$ 20.01
Range of exercise prices, upper	$ 40
Shares, options outstanding	1,562,875
Averaged remaining contractual life (years), options outstanding	4 years 9 months
Aggregate intrinsic value (US$), options outstanding	0
Weighted average exercise price (US$), options outstanding	$ 23.86
Shares, options exercisable	974,750
Average remaining contractual life (years), options exercisable	4 years 1 month 13 days
Aggregate intrinsic value (US$), options exercisable	0
Weighted average exercise price (US$), options exercisable	$ 23.84
$40.01 - 60.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower	$ 40.01
Range of exercise prices, upper	$ 60
Shares, options outstanding	123,250
Averaged remaining contractual life (years), options outstanding	2 years 11 months 19 days
Aggregate intrinsic value (US$), options outstanding	0
Weighted average exercise price (US$), options outstanding	$ 53.08
Shares, options exercisable	123,250
Average remaining contractual life (years), options exercisable	2 years 11 months 19 days
Aggregate intrinsic value (US$), options exercisable	0
Weighted average exercise price (US$), options exercisable	$ 53.08
$60.01 - 80.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower	$ 60.01
Range of exercise prices, upper	$ 80
Shares, options outstanding	72,000
Averaged remaining contractual life (years), options outstanding	3 years 10 months 28 days
Aggregate intrinsic value (US$), options outstanding	0
Weighted average exercise price (US$), options outstanding	$ 71.20
Shares, options exercisable	72,000
Average remaining contractual life (years), options exercisable	3 years 10 months 28 days
Aggregate intrinsic value (US$), options exercisable	0
Weighted average exercise price (US$), options exercisable	$ 71.20
$80.01 - 100.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower	$ 80.01
Range of exercise prices, upper	$ 100
Shares, options outstanding	0
Averaged remaining contractual life (years), options outstanding	0 days
Aggregate intrinsic value (US$), options outstanding	0
Weighted average exercise price (US$), options outstanding	$ 0.00
Shares, options exercisable	0
Average remaining contractual life (years), options exercisable	0 days
Aggregate intrinsic value (US$), options exercisable	0
Weighted average exercise price (US$), options exercisable	$ 0.00
$100.01 - 120.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower	$ 100
Range of exercise prices, upper	$ 120
Shares, options outstanding	139,500
Averaged remaining contractual life (years), options outstanding	2 years 4 months 21 days
Aggregate intrinsic value (US$), options outstanding	0
Weighted average exercise price (US$), options outstanding	$ 111.77
Shares, options exercisable	139,500
Average remaining contractual life (years), options exercisable	2 years 4 months 21 days
Aggregate intrinsic value (US$), options exercisable	$ 0
Weighted average exercise price (US$), options exercisable	$ 111.77