INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2011

Schedule of Finite-Lived Intangible Assets by Major Class [Table Text Block]

Intangible assets consisted of the following:



	December 31, 2011					December 31, 2010
	Cost		Accumulated Amortization			Cost		Accumulated Amortization
	(Thousands of Dollars)
Customer relationships	$	81,025	$	(44,068	)	$	76,910	$	(35,983	)
Other	2,809		(843		)	2,809		(703		)
Total	$	83,834	$	(44,911	)	$	79,719	$	(36,686	)

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

The estimated aggregate amortization expense for the next five years is as follows:



	Amortization Expense
	(Thousands of Dollars)
2012	$	8,213
2013	8,213
2014	8,213
2015	5,266
2016	2,319

- Definition

Tabular disclosure of amortizable intangibles assets, in total and by major class, including the gross carrying amount and accumulated amortization. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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