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Long‑Term Debt - Narrative (Details) |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 19, 2017 USD ($) | Nov. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 02, 2020 USD ($) | Jun. 30, 2020 USD ($) | Apr. 02, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of term loan |  |  | $ 125,000,000 | $ 0 | $ 0 |  |  |
Total carrying value of debt |  |  | 246,000,000 | 233,750,000 |  |  |  |
Amortization and write-off of deferred debt issuance costs |  |  | 985,000 | 553,000 | 552,000 |  |  |
Interest expense other borrowings |  |  | 50,000 | $ 207,000 | $ 255,000 |  |  |
Interest Rate Swap | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  |  |  | $ 200,000,000 | $ 200,000,000
Derivative fair value |  |  | $ 347,000 |  |  |  |  |
Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Weighted average interest rate over time |  |  | 1.92% | 3.47% | 3.28% |  |  |
Accrued interest and fees |  |  |  | $ 0 |  |  |  |
Interest expense for debt |  |  | $ 6,878,000 | 8,971,000 | $ 8,800,000 |  |  |
Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings guaranteed through stock of foreign subsidiaries (as a percent) | 0.65 |  |  |  |  |  |  |
Credit Facility | Letters of Credit And Surety Bonds |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total carrying value of debt |  |  | 150,000 | 546,000 |  |  |  |
Credit Facility | Minimum | Revolving Credit Facility - Non-Euro Currency |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unused capacity, commitment fee percentage | 0.15% |  |  |  |  |  |  |
Credit Facility | Maximum | Revolving Credit Facility - Non-Euro Currency |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unused capacity, commitment fee percentage | 0.30% |  |  |  |  |  |  |
Credit Facility | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility - Non-Euro Currency |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.00% |  |  |  |  |  |  |
Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum | Revolving Credit Facility - Euro Currency |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.00% |  |  |  |  |  |  |
Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum | Revolving Credit Facility - Euro Currency |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.25% |  |  |  |  |  |  |
Credit Facility | Overnight Bank Funding Effective Rate | Revolving Credit Facility - Non-Euro Currency |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.50% |  |  |  |  |  |  |
Credit Facility | Base Rate | Minimum | Revolving Credit Facility - Non-Euro Currency |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.00% |  |  |  |  |  |  |
Credit Facility | Base Rate | Maximum | Revolving Credit Facility - Non-Euro Currency |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.25% |  |  |  |  |  |  |
Term Loan | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amortization and write-off of deferred debt issuance costs |  |  | 553,000 | 553,000 | $ 552,000 |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Accordion feature, increase limit | $ 100,000,000 |  |  |  |  |  |  |
Total carrying value of debt |  |  | 246,000,000 | 233,750,000 |  |  |  |
Line of Credit | Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Remaining borrowing capacity |  |  | 253,850,000 | $ 265,704,000 |  |  |  |
Effective interest rate |  |  |  |  |  |  |  | 0.73%
Line of Credit | Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | 500,000,000 |  |  |  |  |  |  |
Line of Credit | Credit Facility | Letter of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | 50,000,000 |  |  |  |  |  |  |
Line of Credit | Credit Facility | Bridge Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 50,000,000 |  |  |  |  |  |  |
Line of Credit | Term Loan | Secured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 125,000,000 |  |
Repayments of term loan |  | $ 125,000,000 |  |  |  |  |  |
Debt issuance costs |  |  | $ 432,000 |  |  |  |  |

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