Income Tax (Provision for Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current Federal Tax Expense (Benefit)	$ 1,020	$ 1,588	$ 18,495
Current Foreign Tax Expense (Benefit)	47,706	92,045	135,260
Current Income Tax Expense (Benefit)	48,726	93,633	153,755
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred Federal Income Tax Expense (Benefit)	273,928	193,204	242,694
Deferred Foreign Income Tax Expense (Benefit)	19,849	(44,208)	(71,963)
Deferred income taxes	293,777	148,996	170,731
Income Tax Expense (Benefit)	$ 342,503	$ 242,629	$ 324,486