v3.8.0.1

COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Payments for Operating Leases and Purchase Obligations [Table Text Block]

Lessee Commitments. Future minimum rental payments applicable to all noncancellable operating leases and purchase obligations as of December 31, 2017 are as follows:

	Payments Due by Period
	2018				2019				2020				2021				2022				There- after				Total
	(Thousands of Dollars)
Operating leases	$	39,236			$	34,203			$	19,541			$	13,324			$	7,295			$	68,386			$	181,985
Purchase obligations	$	6,963			$	6,133			$	4,686			$	4,690			$	4,480			$	300			$	27,252

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- References

No definition available.

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- Definition

Tabular disclosure of the aggregate amount of payments due on known contractual obligations for the five years following the date of the latest balance sheet and the combined aggregate amount of maturities of known contractual obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 303
-Paragraph a
-Subparagraph 5

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