Lessee, Future Minimum Payments (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Related Party Transaction [Line Items]
2019	$ 24,155
2020	29,969
2021	28,362
2022	25,480
2023	25,031
Thereafter	67,338
Total future minimum rental payments	200,335
Present value discount	28,468
Total operating lease liability	171,867
Third Party Leases
Related Party Transaction [Line Items]
2019	15,889
2020	18,948
2021	18,994
2022	18,868
2023	18,419
Thereafter	29,867
Total future minimum rental payments	120,985
Present value discount	14,691
Total operating lease liability	106,294
Related Party Leases | Equity Method Investee [Member] | Seabrook Logistics, LLC [Member]
Related Party Transaction [Line Items]
2019	8,266
2020	11,021
2021	9,368
2022	6,612
2023	6,612
Thereafter	37,471
Total future minimum rental payments	79,350
Present value discount	13,777
Total operating lease liability	$ 65,573