Commitments And Contingencies (Future Minimum Rental Payments Under All Non-Cancelable Operating Leases) (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Property Subject to or Available for Operating Lease [Line Items]
2016	$ 23,878
2017	17,265
2018	15,836
2019	15,265
2020	13,180
2021 and thereafter	82,138
Total minimum lease obligations	167,562
Office Space [Member]
Property Subject to or Available for Operating Lease [Line Items]
2016	2,203
2017	2,099
2018	2,117
2019	2,065
2020	2,056
2021 and thereafter	4,325
Total minimum lease obligations	14,865
Transportation Equipment [Member]
Property Subject to or Available for Operating Lease [Line Items]
2016	13,569
2017	11,595
2018	10,109
2019	9,535
2020	7,514
2021 and thereafter	18,037
Total minimum lease obligations	70,359
Terminals and Tanks [Member]
Property Subject to or Available for Operating Lease [Line Items]
2016	8,106
2017	3,571
2018	3,610
2019	3,665
2020	3,610
2021 and thereafter	59,776
Total minimum lease obligations	$ 82,338