Lease Disclosures - Future Minimum Lease Payments Under Noncancelable Leases as Lessee (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finance Leases
2021	$ 15,900
2022	14,500
2023	11,700
2024	9,700
2025	8,600
Thereafter	50,900
Total minimum lease payments	111,300
Less: interest/imputed interest	(31,700)
Total obligations	79,600
Less: current portion	(10,600)
Long-term lease obligations	69,012	$ 77,393
Operating Leases
2021	91,100
2022	84,700
2023	69,800
2024	64,300
2025	55,300
Thereafter	144,900
Total minimum lease payments	510,100
Less: interest/imputed interest	(95,200)
Total obligations	414,900
Less: current portion	(69,672)	(72,815)
Long-term lease obligations	$ 345,163	$ 359,025