Commitments And Contingencies (Future Minimum Rental Payments Under All Non-Cancelable Operating Leases) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Property Subject to or Available for Operating Lease [Line Items]
2012	$ 12,529
2013	9,496
2014	7,312
2015	6,478
2016	3,205
2017 and thereafter	20,801
Total minimum lease obligations	59,821
Office Space [Member]
Property Subject to or Available for Operating Lease [Line Items]
2012	885
2013	910
2014	940
2015	956
2016	933
2017 and thereafter	65
Total minimum lease obligations	4,689
Transportation Equipment [Member]
Property Subject to or Available for Operating Lease [Line Items]
2012	6,183
2013	5,510
2014	5,345
2015	4,495
2016	1,245
2017 and thereafter	1,654
Total minimum lease obligations	24,432
Terminals And Tanks [Member]
Property Subject to or Available for Operating Lease [Line Items]
2012	5,461
2013	3,076
2014	1,027
2015	1,027
2016	1,027
2017 and thereafter	19,082
Total minimum lease obligations	$ 30,700