Leases - Supplemental Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Feb. 01, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating leases:
Operating lease right-of-use assets	$ 449,745			$ 0
Operating lease liabilities	93,991			0
Noncurrent operating lease liabilities	357,635			$ 0
Total operating lease liabilities	451,626	$ 15,900	$ 433,400
Finance leases:
Properties, plants and equipment, at cost	12,035
Accumulated amortization	(6,127)
Properties, plants and equipment, net	5,908
Accrued liabilities	1,649
Other long-term liabilities	4,580
Finance Lease, Liability	$ 6,229
Weighted average remaining lease term (in years)
Operating leases	7 years 10 months 24 days
Finance leases	8 years 7 months 6 days
Weighted average discount rate
Operating leases	4.30%
Finance leases	5.10%