Commitments and Contingencies (Details)	0 Months Ended	1 Months Ended		3 Months Ended			6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended	12 Months Ended
	Mar. 31, 2009 AUD	Apr. 30, 2010 AUD	Mar. 31, 2009 USD ($)	Jun. 30, 2011 USD ($)	Jun. 30, 2010 USD ($)	Mar. 31, 2010 USD ($)	Jun. 30, 2011 USD ($)	Jun. 30, 2010 USD ($)	Dec. 31, 2010 USD ($)	Jun. 30, 2011 Helix [Member] USD ($)	Jun. 30, 2010 Helix [Member] USD ($)	Jun. 30, 2011 Helix [Member] USD ($)	Jun. 30, 2010 Helix [Member] USD ($)	Dec. 31, 2010 Helix [Member] USD ($)	Mar. 31, 2011 Australian Subsidiary [Member] USD ($)	Dec. 31, 2010 Australian Subsidiary [Member] USD ($)	Jun. 30, 2011 Australian Subsidiary [Member] USD ($)
Approximate actual damages	32,000,000		$ 12,000,000
Damage claims paid		15,000,000
Settlement of claims						17,500,000
Payments for litigation settlements						13,800,000
Remaining trade receivable write off						3,700,000
Approximate pre-tax loss				58,280,000	(137,439,000)		94,465,000	(162,002,000)		36,512,000	(82,994,000)	55,154,000	(101,702,000)		200,000	30,000,000
Accounts receivable, net				212,406,000			212,406,000		177,293,000	54,325,000		54,325,000		61,846,000			6,700,000
Trade receivables collected							303,000,000
Value added tax assessment							$ 28,000,000