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Leases Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating leases $ 136,292 $ 133,864
Current operating lease liability 22,297 23,137
Other noncurrent liabilities 116,765 114,686
Total operating lease liabilities 139,062 137,823
Net property, plant and equipment 58,963 59,494
Current portion of long-term debt 1,752 636
Long-term debt 58,543 58,888
Total finance lease liabilities $ 60,295 $ 59,524
Weighted average remaining lease term, operating leases 15 years 3 months 18 days 11 years 4 months 24 days
Weighted average remaining lease term, finance leases 27 years 6 months 28 years 3 months 18 days
Weighted average discount rate, operating leases, percent 3.94% 3.84%
Weighted average discount rate, finance leases, percent 4.56% 4.56%
Lessee, Lease, Description [Line Items]    
Operating lease, right-of-use asset $ 136,292 $ 133,864
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccruedLiabilitiesCurrent us-gaap:AccruedLiabilitiesCurrent
Current operating lease liability $ 22,297 $ 23,137
Operating leases 116,765 114,686
Operating lease, lease liability 139,062 137,823
Net property, plant and equipment 58,963 59,494
Current portion of long-term debt 1,752 636
Long-term debt 58,543 58,888
Finance Lease, Liability $ 60,295 $ 59,524
Weighted average remaining lease term, operating leases 15 years 3 months 18 days 11 years 4 months 24 days
Weighted average remaining lease term, finance leases 27 years 6 months 28 years 3 months 18 days
Weighted average discount rate, operating leases, percent 3.94% 3.84%
Weighted average discount rate, finance leases, percent 4.56% 4.56%
Other noncurrent liabilities    
Leases [Abstract]    
Other noncurrent liabilities $ 116,765 $ 114,686
Lessee, Lease, Description [Line Items]    
Operating leases $ 116,765 $ 114,686