Leases Leases Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Other assets	$ 141,827	$ 133,864
Current operating lease liability	23,826	23,137
Other noncurrent liabilities	119,233	114,686
Total operating lease liabilities	143,059	137,823
Net property, plant and equipment	59,320	59,494
Current portion of long-term debt	615	636
Long-term debt	58,713	58,888
Total finance lease liabilities	$ 59,328	$ 59,524
Weighted average remaining lease term, operating leases	15 years 9 months 18 days	11 years 4 months 24 days
Weighted average remaining lease term, finance leases	28 years 2 months 12 days	28 years 3 months 18 days
Weighted average discount rate, operating leases, percent	4.08%	3.84%
Weighted average discount rate, finance leases, percent	4.56%	4.56%