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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%