ASSET RETIREMENT OBLIGATION: (Details) (USD $)	3 Months Ended	63 Months Ended
Mar. 31, 2015 item	Mar. 31, 2014	Mar. 31, 2015
ASSET RETIREMENT OBLIGATION:
Period after which successive reviews are required by the law (in years)	5 years
Accepted value of the Lima office building	$ 27,800,000		$ 27,800,000
Cumulative guarantee amount	17,900,000		17,900,000
Number of units with future closure costs recognized as an asset retirement obligation	3
Environmental costs
Environmental remediation	5,928,000us-gaap_EnvironmentalRemediationExpense
Asset retirement obligation activity
Balance at the beginning of the period	116,100,000us-gaap_AssetRetirementObligation	124,800,000us-gaap_AssetRetirementObligation
Changes in estimates		26,700,000
Payments	(4,200,000)	(1,500,000)
Accretion expense	2,900,000	2,000,000
Balance at the end of the period	114,800,000us-gaap_AssetRetirementObligation	152,000,000us-gaap_AssetRetirementObligation	114,800,000us-gaap_AssetRetirementObligation
Mexico
Environmental costs
Plant demolition and soil remediation budgeted cost			62,400,000
Environmental remediation			$ 51,100,000

Represents the cumulative amount of Guarantees paid for an asset retirement obligation.

No definition available.

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- Definition

Represents the period after which successive reviews are required by the law.

+ References

No definition available.

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- Definition

Represents the number of units for which the entity has recognized an asset retirement obligation.

+ References

No definition available.

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- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Asset Retirement Obligation

-URI http://asc.fasb.org/extlink&oid=6505190

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848

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-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)(3)

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- Definition

Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

+ References

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Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

+ References

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- Definition

Total anticipated costs associated with remediation, site restoration, postclosure, monitoring commitments, or other exit costs that may occur on the sale, disposal, or abandonment of a particular property resulting from unanticipated contamination of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 5.Y.Q4)

-URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section Y

-Paragraph Question 4

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The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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-SubTopic 30

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-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859

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- Definition

Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

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