Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Activities by Segment [Abstract]
Revenues	$ 953,501	$ 877,489
Segment operating earnings	14,864	11,614
Depreciation Depletion and Amortization	5,529	4,163
Property and Equipment Additions	3,903	15,222
Segment operating earnings [Abstract]
Segment operating earnings	14,864	11,614
General and administrative expenses	(2,266)	(2,232)
Operating earnings	12,598	9,382
Interest income	38	21
Interest expense	(2)	(1)
Earnings from continuing operations before income taxes	12,634	9,402
Identifiable assets by segment [Abstract]
Assets	417,818		419,501
Marketing [Member]
Activities by Segment [Abstract]
Revenues	932,942	857,430
Segment operating earnings	13,582	8,158
Depreciation Depletion and Amortization	1,779	1,291
Property and Equipment Additions	1,361	4,199
Segment operating earnings [Abstract]
Segment operating earnings	13,582	8,158
Identifiable assets by segment [Abstract]
Assets	306,852		289,684
Marketing [Member] \| Crude Oil [Member]
Activities by Segment [Abstract]
Revenues	931,876	855,846
Segment operating earnings	13,434	7,765
Depreciation Depletion and Amortization	1,764	1,290
Property and Equipment Additions	1,361	4,199
Segment operating earnings [Abstract]
Segment operating earnings	13,434	7,765
Identifiable assets by segment [Abstract]
Assets	298,124		277,920
Marketing [Member] \| Natural Gas [Member]
Activities by Segment [Abstract]
Revenues	1,066	1,584
Segment operating earnings	148	393
Depreciation Depletion and Amortization	15	1
Property and Equipment Additions	0	0
Segment operating earnings [Abstract]
Segment operating earnings	148	393
Identifiable assets by segment [Abstract]
Assets	8,728		11,764
Transportation [Member]
Activities by Segment [Abstract]
Revenues	17,346	16,268
Segment operating earnings	1,398	3,054
Depreciation Depletion and Amortization	1,736	1,251
Property and Equipment Additions	145	4,688
Segment operating earnings [Abstract]
Segment operating earnings	1,398	3,054
Identifiable assets by segment [Abstract]
Assets	37,619		38,940
Oil and Gas [Member]
Activities by Segment [Abstract]
Revenues	3,213	3,791
Segment operating earnings	(116)	402
Depreciation Depletion and Amortization	2,014	1,621
Property and Equipment Additions	2,397	6,335
Segment operating earnings [Abstract]
Segment operating earnings	(116)	402
Identifiable assets by segment [Abstract]
Assets	35,043		35,788
Other [Member]
Identifiable assets by segment [Abstract]
Assets	$ 38,304		$ 55,089

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