Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Operating Leases:
Right-of-use assets, net	$ 98,841	$ 96,849
Current portion of operating lease liabilities	25,112	24,862
Operating lease liabilities	72,090	69,860
Finance Leases:
Property, plant and equipment, net	12,508	8,434
Current maturities of long-term debt	2,724	1,683
Long-term debt	$ 10,011	$ 6,867