Supplemental Balance Sheet, Income Statement and Cash Flow Information (Details 3) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Losses (gains) on sales and disposals of long-lived assets and other expense (income)
Losses (gains) on sales, disposals and involuntary conversions of long-lived assets	$ 20,984	$ (27,641)	$ 23,709	$ (14,095)
Other-than-temporary impairment of unconsolidated affiliate	180,591		180,591
Provision for International operations	48,279		48,279
Merger transaction			(47,074)
Merger transaction	5,500	17,000		17,000
Litigation expenses	5,522	3,177	3,578	6,804
Foreign currency transaction losses (gains)	(1,496)	2,374	(2,044)	3,417
Other losses (gains)	351	3,577	(1,812)	3,341
Losses (gains) on sales and retirements of long-lived assets and other expense (income), net	259,731	(1,513)	205,227	$ 16,467
Gain on sale of Alaska E&P assets		$ 22,200
Provision for assets and receivable impacted by degradation of overall country economy	25,400		25,400
Charge for remeasurement of net monetary assets	$ 10,000		$ 10,000
Official exchange rate of Bolivares per USD	6.3		6.3
SIMADI exchange rate of Bolivares per USD	199		199
Write-off of receivable	$ 15,400		$ 15,400
Provision for exit of non-core business line	$ 22,900		$ 22,900