EMPLOYEE BENEFIT PLANS (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Amounts recognized for pension benefits
Noncurrent Liability	$ 30,394	$ 27,882
Amounts recognized for pension benefits in accumulated other comprehensive loss
Income tax effect	0	0
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Loss:
Total recognized in other comprehensive loss	4,010	6,675
Plan assets
Fair value of pension plan assets	42,518	39,053
Quoted Prices in Active Markets for Identical Assets (Level 1)
Plan assets
Fair value of pension plan assets		35,880
Significant Other Observable Inputs (Level 2)
Plan assets
Fair value of pension plan assets	42,518	3,173
Pooled equity funds
Plan assets
Fair value of pension plan assets		14,851
Pooled equity funds | AHGT
Plan assets
Fair value of pension plan assets	23,706
Pooled equity funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Plan assets
Fair value of pension plan assets		14,851
Pooled equity funds | Significant Other Observable Inputs (Level 2) | AHGT
Plan assets
Fair value of pension plan assets	23,706
Pooled fixed income funds
Plan assets
Fair value of pension plan assets		4,814
Pooled fixed income funds | AHGT
Plan assets
Fair value of pension plan assets	17,671
Pooled fixed income funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Plan assets
Fair value of pension plan assets		4,814
Pooled fixed income funds | Significant Other Observable Inputs (Level 2) | AHGT
Plan assets
Fair value of pension plan assets	17,671
Cash management funds
Plan assets
Fair value of pension plan assets	1,141	1,870
Cash management funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Plan assets
Fair value of pension plan assets		1,870
Cash management funds | Significant Other Observable Inputs (Level 2)
Plan assets
Fair value of pension plan assets	1,141
Common Stock
Plan assets
Fair value of pension plan assets		11,470
Common Stock | Quoted Prices in Active Markets for Identical Assets (Level 1)
Plan assets
Fair value of pension plan assets		11,470
U.S. government securities
Plan assets
Fair value of pension plan assets		5,756
U.S. government securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Plan assets
Fair value of pension plan assets		2,630
U.S. government securities | Significant Other Observable Inputs (Level 2)
Plan assets
Fair value of pension plan assets		3,126
Other investments
Plan assets
Fair value of pension plan assets		292
Other investments | Quoted Prices in Active Markets for Identical Assets (Level 1)
Plan assets
Fair value of pension plan assets		245
Other investments | Significant Other Observable Inputs (Level 2)
Plan assets
Fair value of pension plan assets		47
Pension Benefits
Amounts recognized for pension benefits
Current Liability	306	300
Noncurrent Liability	30,000	27,292
Net amounts recognized	30,306	27,592
Amounts recognized for pension benefits in accumulated other comprehensive loss
Income tax effect	0	0
Net loss	27,579	23,569
Net amounts recognized	27,579	23,569
Net loss included in other comprehensive loss expected to be recognized as a component of net periodic pension cost in the next fiscal year	873
Pension and other benefits:
Service cost		18
Interest cost	3,189	3,338
Expected return on plan assets	(2,864)	(3,027)
Recognized net actuarial (gain) loss	739	809
Amortization of obligation		5
Amortization of prior service cost		2
Recognition of (gain) loss due to curtailment		12
Net expense	1,064	1,157
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Loss:
Net loss	4,749	7,503
Recognized gain (loss)	(739)	(809)
Recognized prior service cost		(8)
Recognized net initial obligation		(11)
Total recognized in other comprehensive loss	4,010	6,675
Weighed average assumptions used to determine net periodic cost:
Expected long-term return on plan assets (as a percent)	7.50%	7.50%
Plan assets
Fair value of pension plan assets	$ 42,518	$ 39,053	$ 41,255
Pension Benefits | Minimum
Weighed average assumptions used to determine net periodic cost:
Discount rate (as a percent)	4.79%	5.25%
Pension Benefits | Maximum
Weighed average assumptions used to determine net periodic cost:
Discount rate (as a percent)	4.98%	5.47%