Income Taxes (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2031	Dec. 31, 2008
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 6,659,593,000			$ 76,493,000
Unrecognized tax benefit	68,848,000	81,174,000	69,048,000		51,819,000
Income Taxes (Textual) [Abstract]
Liability related to unrecognized tax benefit including accrued interest and penalties	28,200,000	42,900,000	38,500,000
Tax expense including interest and penalties	4,600,000	5,100,000	5,200,000
US Federal tax rate	35.00%
NOL carryforwards for alternative minimum tax purpose	686,000,000
Net operating loss carryforwards	2,009,318,000	1,848,956,000
Recognized valuation allowance relating to NOL carryforwards	1,450,000,000
Domestic Country [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	1,230,045,000
Expiration date of NOL carry forwards	2016 to 2031
Foreign Country [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	5,429,548,000
Expiration date of NOL carry forwards	2012 to 2031
NOL carryforward expiring other jurisdiction	408,000,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	649,000,000
Expiration date of NOL carry forwards	2012 to 2031
Algeria Audit Assessment [Member]
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefit	13,500,000
Addition to unrecognized tax benefits	10,800,000
Canada Revenue Agency [Member]
Operating Loss Carryforwards [Line Items]
Tax audit settlements	16,800,000
Income tax audit settlement period	1995 to 1997
Reduction to unrecognized tax benefits	$ 8,600,000