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Leases - Components of lease expense, and lease assets and liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Lease Cost: |  |  |
Amortization of right-of-use assets (included in depreciation expense) | $ 727 | $ 711 |
Interest on lease liabilities | 428 | 548 |
Operating lease cost | 15,930 | 17,014 |
Short-term lease cost | 573 | 566 |
Variable lease cost | 1,748 | 1,899 |
Total lease cost | 19,406 | 20,738 |
Cash paid for amounts included in the measurement of lease liabilities: |  |  |
Operating cash flows used for finance lease | 462 | 578 |
Operating cash flows used for operating leases | 15,627 | 15,169 |
Financing cash flows used for finance lease | 1,351 | 1,168 | $ 1,025
Right-of-use assets obtained in exchange for new operating lease liabilities | 17,607 | 15,501 |
Assets and Liabilities, Lessee [Abstract] |  |  |
Finance lease right-of-use assets (included in other assets) | $ 2,448 | $ 2,311 |
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | us-gaap:OtherAssetsMember | us-gaap:OtherAssetsMember |
Operating lease right-of-use assets | $ 79,966 | $ 76,859 |
Finance lease liability, current (included in current installments of long-term debt) | $ 1,661 | $ 1,325 |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] | bhe:LongTermDebtAndCapitalLeaseObligationsCurrentMember | bhe:LongTermDebtAndCapitalLeaseObligationsCurrentMember |
Finance lease liability, noncurrent (included in long-term debt) | $ 2,832 | $ 3,654 |
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | bhe:LongTermDebtAndCapitalLeaseObligationsMember | bhe:LongTermDebtAndCapitalLeaseObligationsMember |
Operating lease liabilities, current (included in accrued liabilities) | $ 11,516 | $ 11,043 |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | us-gaap:AccruedLiabilitiesMember | us-gaap:AccruedLiabilitiesMember |
Operating lease liabilities, noncurrent | $ 72,120 | $ 67,898 |
Weighted average remaining lease term – finance leases | 3 years | 3 years 6 months |
Weighted average remaining lease term – operating leases | 10 years | 10 years 2 months 12 days |
Weighted average discount rate – finance leases | 9.00% | 10.10% |
Weighted average discount rate – operating leases | 4.40% | 4.70% |

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