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Long‑Term Debt - Narrative (Details) |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 19, 2017 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 02, 2020 USD ($) | Apr. 02, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total carrying value of debt |  | $ 589,583,000 |  | $ 589,583,000 |  |  |  |  | $ 233,750,000
Amortization of deferred debt issuance costs |  |  |  | 430,000 | $ 415,000 |  |  |  |
Interest expense other borrowings |  | 15,000 | $ 13,000 | 40,000 | $ 157,000 |  |  |  |
Interest Rate Swap | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  |  |  | $ 200,000,000 | $ 200,000,000 |
Derivative fair value |  | $ 3,365,000 |  | $ 3,365,000 |  |  |  |  |
Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Weighted average interest rate over time |  | 1.59% | 3.43% | 1.92% | 3.63% |  |  |  |
Accrued interest and fees |  | $ 26,000 |  | $ 26,000 |  |  |  |  | 0
Interest expense for debt |  | 1,807,000 | $ 2,305,000 | 4,351,000 | $ 6,905,000 |  |  |  |
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 |  | 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 of deferred debt issuance costs |  | 153,000 | $ 138,000 | 430,000 | $ 415,000 |  |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total carrying value of debt |  | 465,000,000 |  | 465,000,000 |  |  |  |  | 233,750,000
Accordion feature, increase limit | $ 100,000,000 |  |  |  |  |  |  |  |
Line of Credit | Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Remaining borrowing capacity |  | 34,850,000 |  | 34,850,000 |  |  |  |  | 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 |  |  |
Total carrying value of debt |  | 124,583,000 |  | 124,583,000 |  | $ 417,000 |  |  | $ 0
Debt issuance costs |  | $ 432,000 |  | $ 432,000 |  |  |  |  |

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