Leases - Supplemental Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Feb. 01, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating leases:
Operating lease right-of-use assets	$ 453,377			$ 0
Operating lease liabilities	99,622			0
Noncurrent operating lease liabilities	355,410			$ 0
Total operating lease liabilities	455,032	$ 15,600	$ 433,400
Finance leases:
Properties, plants and equipment, at cost	12,830
Accumulated amortization	(6,375)
Properties, plants and equipment, net	6,455
Accrued liabilities	1,663
Other long-term liabilities	4,929
Finance Lease, Liability	$ 6,592
Weighted average remaining lease term (in years)
Operating leases	7 years 7 months 6 days
Finance leases	8 years 2 months 12 days
Weighted average discount rate
Operating leases	4.20%
Finance leases	5.30%