Summary of Significant Accounting Policies - Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Inventories
Inventories	$ 450,482	$ 386,442
Positive exchange balances	9,200	3,800
Negative exchange balances	17,600	14,900
Distillates, home heating oil, diesel and kerosene
Inventories
Inventories	222,202	173,403
Gasoline
Inventories
Inventories	120,958	93,534
Gasoline blendstocks
Inventories
Inventories	39,702	52,195
Crude Oil
Inventories
Inventories	16,018	21,325
Residual oil
Inventories
Inventories	26,521	21,054
Propane and other
Inventories
Inventories	1,356	1,447
Renewable identification numbers (RINs)
Inventories
Inventories	1,329	1,034
Convenience store inventory
Inventories
Inventories	$ 22,396	$ 22,450