Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Leases
Operating lease right-of-use assets	$ 136,122	$ 117,921	$ 0
Operating lease liabilities – short-term	35,656	24,794	0
Operating lease liabilities – long-term	100,752	93,127	$ 0
Total operating lease liabilities	136,408
Finance Leases
Property, plant and equipment – gross	2,633
Accumulated depreciation	(1,206)
Property, plant and equipment – net	1,427	$ 1,032
Accounts payable	676
Other liabilities	768
Total finance lease liabilities	$ 1,444
Weighted Average Remaining Lease Term
Operating leases	9 years 2 months 12 days
Finance leases	2 years 3 months 18 days
Weighted Average Discount Rate
Operating leases	5.75%
Finance leases	4.87%