Leases Operating Lease, Other Disclosure (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Current lease liability	$ 23,264	$ 0
Long-term lease liability	148,603	0
Right-of-use asset	172,105	$ 0
Fixed lease cost	7,576
Short-term lease cost	457
Variable lease cost	371
Total lease cost	8,404
Operating cash flows from operating leases	$ 5,981
Weighted average remaining lease term (years)	8 years
Weighted-average discount rate	4.20%
Third Party Leases
Related Party Transaction [Line Items]
Current lease liability	$ 14,828
Long-term lease liability	91,466
Right-of-use asset	106,532
Fixed lease cost	4,821
Short-term lease cost	457
Variable lease cost	371
Total lease cost	5,649
Operating cash flows from operating leases	$ 3,226
Weighted average remaining lease term (years)	7 years
Weighted-average discount rate	4.10%
Seabrook Logistics, LLC [Member] | Equity Method Investee [Member] | Related Party Leases
Related Party Transaction [Line Items]
Current lease liability	$ 8,436
Long-term lease liability	57,137
Right-of-use asset	65,573
Fixed lease cost	2,755
Short-term lease cost	0
Variable lease cost	0
Total lease cost	2,755
Operating cash flows from operating leases	$ 2,755
Weighted average remaining lease term (years)	9 years
Weighted-average discount rate	4.30%