Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Operating Leases
Operating lease right-of-use assets	$ 71,557	$ 0
Current operating lease liabilities	12,058	0
Operating lease liabilities	69,975	0
Total operating lease liabilities	82,033
Finance Leases
Property, plant and equipment, gross	45,315
Accumulated depreciation	(23,697)
Property, plant and equipment, net	21,618
Current finance lease liabilities	6,984	7,743
Finance lease liabilities	3,397	$ 5,571
Total finance lease liabilities	$ 10,381
Weighted Average Remaining Lease Term
Operating leases, weighted average remaining lease term	6 years
Finance leases, weighted average remaining lease term	1 year 4 months 25 days
Weighted Average Discount Rate
Operating leases, weighted average discount rate, percentage	7.00%
Finance leases, weighted average discount rate, percentage	4.00%