Commitments And Contingencies (Future Minimum Rental Payments Under All Non-Cancelable Operating Leases) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Property Subject to or Available for Operating Lease [Line Items]
2013	$ 19,285
2014	21,313
2015	15,944
2016	12,035
2017	9,639
2018 and thereafter	43,145
Total minimum lease obligations	121,361
Office Space [Member]
Property Subject to or Available for Operating Lease [Line Items]
2013	1,006
2014	1,219
2015	1,207
2016	1,173
2017	1,029
2018 and thereafter	5,169
Total minimum lease obligations	10,803
Transportation Equipment [Member]
Property Subject to or Available for Operating Lease [Line Items]
2013	12,273
2014	13,965
2015	12,166
2016	8,488
2017	6,236
2018 and thereafter	13,431
Total minimum lease obligations	66,559
Terminals and Tanks [Member]
Property Subject to or Available for Operating Lease [Line Items]
2013	6,006
2014	6,129
2015	2,571
2016	2,374
2017	2,374
2018 and thereafter	24,545
Total minimum lease obligations	$ 43,999