Debt and Capital Lease Obligations (Details 4) (USD $)	12 Months Ended										0 Months Ended	12 Months Ended				1 Months Ended		12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010		Sep. 30, 2012 Whitebox Revolving Credit Facility	Aug. 12, 2011 Whitebox Revolving Credit Facility	May 24, 2011 Whitebox Revolving Credit Facility	Dec. 31, 2010 Whitebox Revolving Credit Facility	May 24, 2011 RBC Revolving Credit Facility	Dec. 31, 2011 RBC Revolving Credit Facility		Dec. 31, 2010 RBC Revolving Credit Facility	Feb. 12, 2010 RBC Revolving Credit Facility	Feb. 28, 2010 Other income	May 31, 2011 Other income RBC Revolving Credit Facility	Dec. 31, 2011 Other income RBC Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity under the facility							$ 50,000,000							$ 40,000,000	$ 50,000,000
Effective interest rate								8.75%	8.75%	8.75%	8.75%
Amount outstanding under the facility									48,300,000		29,800,000			23,000,000
Write-offs associated with early extinguishment of debt	0	[1]	1,121,000	[1]	811,000	[1]						1,100,000	[1]			800,000	1,100,000	1,100,000	[1]
Repayment amount											$ 30,500,000

[1] In May 2011, the Company wrote off $1.1 million of deferred financing costs in connection with the early extinguishment of the RBC Revolving Credit Facility which is included in other income (expense) in the Company’s consolidated statement of operations. In February 2010, in connection with the closing of the acquisition of PGS Onshore, the Company wrote off $0.8 million of deferred financing costs related to the early extinguishment of certain debt which is included in other income (expense) in the Company’s consolidated statement of operations.