Lessee, Future Minimum Payments (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Related Party Transaction [Line Items]
2019	$ 18,175
2020	28,939
2021	27,848
2022	25,360
2023	24,837
Thereafter	71,149
Total future minimum rental payments	196,308
Present value discount	27,105
Total operating lease liability	169,203
Third Party Leases
Related Party Transaction [Line Items]
2019	12,961
2020	18,510
2021	18,875
2022	18,748
2023	18,225
Thereafter	33,676
Total future minimum rental payments	120,995
Present value discount	14,105
Total operating lease liability	106,890
Related Party Leases | Equity Method Investee [Member] | Seabrook Logistics, LLC [Member]
Related Party Transaction [Line Items]
2019	5,214
2020	10,429
2021	8,973
2022	6,612
2023	6,612
Thereafter	37,473
Total future minimum rental payments	75,313
Present value discount	13,000
Total operating lease liability	$ 62,313