INCOME TAXES (Details 3) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
United States-Federal									$ 18,917,000	$ (19,716,000)	$ 6,517,000
United States-State									1,085,000	(16,000)	1,654,000
Foreign									11,099,000	12,721,000	11,784,000
Total current income tax expense (benefit)									31,101,000	(7,011,000)	19,955,000
Deferred:
United States-Federal									6,124,000	29,553,000	2,333,000
United States-State									1,769,000	197,000	(1,467,000)
Foreign									(537,000)	(2,170,000)	(1,214,000)
Total deferred income tax expense (benefit)									7,356,000	27,580,000	(348,000)
Total income tax expense	14,184,000	9,513,000	7,979,000	6,781,000	4,494,000	11,193,000	1,052,000	3,830,000	38,457,000	20,569,000	19,607,000
Consolidated:
United States-Federal									25,041,000	9,837,000	8,850,000
United States-State									2,854,000	181,000	187,000
Foreign									10,562,000	10,551,000	10,570,000
Total income tax expense	14,184,000	9,513,000	7,979,000	6,781,000	4,494,000	11,193,000	1,052,000	3,830,000	38,457,000	20,569,000	19,607,000
Deferred tax assets:
Receivables reserve	4,589,000				4,852,000				4,589,000	4,852,000
Temporary differences not currently deductible for tax	12,540,000				9,910,000				12,540,000	9,910,000
Deferred compensation	1,851,000				1,376,000				1,851,000	1,376,000
Foreign tax credit carryforwards	15,395,000				16,755,000				15,395,000	16,755,000
Interest rate swap	4,457,000				4,535,000				4,457,000	4,535,000
Net operating losses	1,732,000				9,719,000				1,732,000	9,719,000
Tax credits					62,000					62,000
Pension benefits					640,000					640,000
Valuation allowance	(16,788,000)				(17,315,000)				(16,788,000)	(17,315,000)
Total deferred tax asset	23,776,000				30,534,000				23,776,000	30,534,000
Deferred tax liabilities:
Property, plant and equipment, net	58,521,000				55,762,000				58,521,000	55,762,000
Intangible assets, net	38,034,000				39,477,000				38,034,000	39,477,000
Market discount	2,280,000				2,280,000				2,280,000	2,280,000
Pension	598,000								598,000
Total deferred tax liabilities	99,433,000				97,519,000				99,433,000	97,519,000
Net deferred tax liabilities	75,657,000				66,985,000				75,657,000	66,985,000
Deferred tax assets:
Current	8,349,000				21,921,000				8,349,000	21,921,000
Total deferred tax asset	8,349,000				21,921,000				8,349,000	21,921,000
Deferred tax liabilities:
Deferred income taxes	84,006,000				88,906,000				84,006,000	88,906,000
Total deferred tax liabilities	84,006,000				88,906,000				84,006,000	88,906,000
Net deferred tax liabilities	75,657,000				66,985,000				75,657,000	66,985,000
State
Operating loss carryforwards
Net operating loss carryforwards	$ 15,200,000								$ 15,200,000