Leases Leases Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Other assets	$ 130,628
Current operating lease liability	21,299	$ 0
Other noncurrent liabilities	110,058
Total operating lease liabilities	131,357
Net property, plant and equipment	4,105
Current portion of long-term debt	684
Long-term debt	3,601
Total finance lease liabilities	$ 4,285
Weighted average remaining lease term, operating leases	11 years 10 months 24 days
Weighted average remaining lease term, finance leases	6 years 6 months
Weighted average discount rate, operating leases, percent	3.88%
Weighted average discount rate, finance leases, percent	2.90%