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NON-CONTROLLING INTEREST: (Details) | Dec. 31, 2012
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NON-CONTROLLING INTEREST: |
Investment shareholders' interest in Peruvian Branch (as a percent) | 0.71%

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- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_NoncontrollingInterestAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration