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OTHER LONG-TERM DEBT (Loans to TPSCo from Japanese Institutions) (Narrative) (Details) ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 JPY (¥) | Dec. 31, 2017 JPY (¥) | Dec. 31, 2016 USD ($)
TPSCo [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Outstanding principal |  | $ 100,000 |  |  |  |
TPSCo [Member] | Term Loan 2014[Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Outstanding principal |  |  | $ 33,000 |  |  |
TPSCo [Member] | Term Loan 2014[Member] | JPY [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Outstanding principal | ¥ |  |  |  |  | ¥ 8,800,000 |
TPSCo [Member] | Term Loan 2015 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity term | 5 years |  |  |  |  |
Outstanding principal |  |  | 65,000 |  |  |
TPSCo [Member] | Term Loan 2015 [Member] | JPY [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Outstanding principal | ¥ |  |  |  |  | ¥ 8,500,000 |
TPSCo [Member] | Term Loan 2018 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity term |  | 7 years |  |  |  |
Outstanding principal |  | $ 100,000 |  |  |  |
Basis spread over variable interest rate |  | 1.95% |  |  |  |
TPSCo [Member] | Term Loan 2018 [Member] | JPY [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Outstanding principal | ¥ |  |  |  | ¥ 11,000,000 |  |
JA Mitsui Leasing Capital Corporation [Member] | Loan to TJT [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Outstanding principal |  |  | $ 40,000 |  |  | $ 40,000
Basis spread over variable interest rate |  |  | 2.00% |  |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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