Sale-Leasebacks of Real Estate - Future Minimum Lease Payments (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
2020	$ 18,534
2021	17,217
2022	11,987
2023	8,538
2024	4,827
Thereafter	5,386
Total future minimum lease payments	66,489
Interest portion	(8,249)
Total future minimum lease payments less interest	58,240
Warehouses Under Sale Leaseback Transactions
Lessee, Lease, Description [Line Items]
2020	17,087
2021	17,351
2022	17,619
2023	17,892
2024	18,170
Thereafter	115,090
Total future minimum lease payments	203,209
Interest portion	(87,450)
Total future minimum lease payments less interest	$ 115,759