Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Operating Leases:
Right-of-use assets, net	$ 44,145	$ 0
Other current liabilities	12,960	0
Operating lease liabilities	31,440	$ 0
Finance Leases:
Property, plant and equipment, net	2,356
Current maturities of long-term debt	1,216
Long-term debt	$ 1,171