Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in unrecognized tax benefits
Balance as of January 1	$ 47,552,000	$ 83,950,000	$ 68,848,000
Additions based on tax positions related to the current year	167,107,000	145,000	922,000
Additions for tax positions of prior years	1,744,000	3,360,000	16,372,000
Reductions for tax positions of prior years	(4,473,000)	(30,320,000)	(1,174,000)
Settlements	(8,223,000)	(9,583,000)	(1,018,000)
Balance as of December 31	203,707,000	47,552,000	83,950,000
Additions based on tax positions related to the current year due to internal restructuring	166,000,000
Reductions for tax positions for prior years due to expiration of statutes	8,700,000
Interest and penalties on unrecognized tax benefits	16,900,000	20,600,000	42,800,000
Liability related to unrecognized tax benefit for accrued interest and penalties	6,100,000	5,200,000	2,700,000
Mexico Audit Assessment
Change in unrecognized tax benefits
Addition to unrecognized tax benefits		10,400,000
Algeria Canada And Oman Settlements
Change in unrecognized tax benefits
Settlements	$ 21,600,000