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Borrowing Facilities (Details) $ in Thousands, THB in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 THB | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Nov. 12, 2015 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit Agreement maturity date |  |  |  | Nov. 12, 2020 |  |  |
Principal amount |  |  |  |  | $ 214,172 | $ 226,568 |
Credit Agreement [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit Agreement capacity |  |  |  |  | 430,000 |  |
Credit agreement, secured by percentage of stock of the Company's domestic subsidiaries |  |  |  | 100.00% |  |  |
Credit agreement, secured by percentage of voting capital stock of each direct foreign subsidiary |  |  |  | 65.00% |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit Agreement capacity |  |  |  |  | 200,000 |  |
Term period |  |  |  | 5 years |  |  |
Credit Agreement maturity date |  |  |  | Nov. 12, 2020 |  |  |
Possible increase to total commitments under Credit Agreement |  |  |  |  | 150,000 |  |
Letters of credit outstanding amount |  |  |  |  | 2,600 |  |
Revolving credit facility, available for future borrowings |  |  |  |  | 197,400 |  |
Term Loan Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Term period |  |  |  | 5 years |  |  |
Credit Agreement maturity date |  |  |  | Nov. 12, 2020 |  |  |
Term Loan proceeds |  |  |  |  |  |  | $ 230,000
Term Loan frequency of periodic payments |  |  |  | quarterly |  |  |
Derivative Notional Amount |  |  |  |  | 155,300 |  |
Principal amount |  |  |  |  | 207,000 |  |
Term Loan Facility [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Derivative Notional Amount |  |  |  |  | 155,300 |  |
Term Loan Facility [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Quarterly principal installments | $ 8,600 | $ 5,800 | $ 4,300 |  |  |  |
Standby Letters Of Credit [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Revolving credit facility, available for future borrowings |  |  |  |  | 20,000 |  |
Foreign currencies [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Revolving credit facility, available for future borrowings |  |  |  |  | $ 20,000 |  |
Thailand Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit Agreement maturity date |  |  |  | Oct. 31, 2018 |  |  |
Benchmark Electronics (Thailand) Public Company Limited [Member] | Thailand Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit Agreement capacity | THB |  |  |  | THB 350 |  |  |
Minimum [Member] | Credit Agreement [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
U.S. Credit facility, commitment fee |  |  |  | 0.30% |  |  |
Maximum [Member] | Credit Agreement [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
U.S. Credit facility, commitment fee |  |  |  | 0.40% |  |  |
LIBOR Plus [Member] | Minimum [Member] | Credit Agreement [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.25% |  |  |
LIBOR Plus [Member] | Maximum [Member] | Credit Agreement [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 2.25% |  |  |
Alternate Base Rate Plus [Member] | Minimum [Member] | Credit Agreement [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 0.25% |  |  |
Alternate Base Rate Plus [Member] | Maximum [Member] | Credit Agreement [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.25% |  |  |

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