Income Taxes (Components of Income from Continuing Operations Before Income Taxes and Income Tax Expense) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income (loss) from continuing operations before income taxes
United States									$ (1,259,268)	$ 179,484	$ (5,810)
Foreign									(2,022,994)	1,072,786	1,478,497
Income (loss) from continuing operations before income taxes	$ (646,500)	$ (2,408,000)	$ (110,100)	$ (117,700)	$ 217,000	$ 396,500	$ 304,600	$ 334,200	(3,282,262)	1,252,270	1,472,687
Income tax expense (benefit)
Federal - Current									(9,435)	25,151	(56,790)
Federal - Deferred									(241,127)	25,444	65,883
Total Federal income tax expense (benefit)									(250,562)	50,595	9,093
State									(5,294)	8,840	7,141
Foreign - Current									(40,550)	359,502	477,715
Foreign - Deferred									(730,084)	(191,640)	90,601
Total Foreign income tax expense (benefit)									(770,634)	167,862	568,316
Total income tax expense (benefit)									$ (1,026,490)	$ 227,297	$ 584,550