Goodwill and Other Intangibles (Details 2) (USD $)	12 Months Ended				12 Months Ended		12 Months Ended		1 Months Ended	12 Months Ended		12 Months Ended				12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Jun. 03, 2011 Ross Smith Energy Group Ltd. ("RSEG")	Dec. 31, 2011 Trade names Y	Dec. 31, 2010 Trade names	Dec. 31, 2011 Customer related intangibles Y	Dec. 31, 2010 Customer related intangibles	Jun. 30, 2011 Customer related intangibles Ross Smith Energy Group Ltd. ("RSEG") Y	Dec. 31, 2011 Customer related intangibles Ross Smith Energy Group Ltd. ("RSEG") Y	Jun. 03, 2011 Customer related intangibles Ross Smith Energy Group Ltd. ("RSEG")	Dec. 31, 2011 Proprietary software Y	Dec. 31, 2010 Proprietary software	Dec. 31, 2011 Trading rights	Dec. 31, 2010 Trading rights	Dec. 31, 2011 Other	Dec. 31, 2010 Other	Dec. 31, 2011 POSIT trade name
Other Intangible Assets
Gross Carrying Amount	$ 59,420,000	$ 52,392,000			$ 10,400,000	$ 10,400,000	$ 27,851,000	$ 20,901,000				$ 20,876,000	$ 20,876,000	$ 243,000	$ 165,000	$ 50,000	$ 50,000
Accumulated Amortization	19,826,000	15,608,000			1,293,000	1,036,000	4,497,000	2,571,000				14,036,000	12,001,000
Customer related intangible asset				6,950,000						7,000,000	7,000,000
Useful lives (in years)					5.0		13.1		10	10		6.4
Other intangible assets not subject to amortization	8,700,000																	8,400,000
Amortization expense of other intangible assets	4,200,000	3,000,000	3,300,000
Estimate of future amortization expense for acquired other intangibles
2012																4,506,000
2013																4,506,000
2014																3,952,000
2015																2,602,000
2016																2,602,000
Thereafter																12,734,000
Total																$ 30,902,000