Income Tax (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Valuation Allowance	$ 127,132	$ 112,005
Tax Adjustments Settlements And Unusual Provisions	4,200
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability	992,900	1,115,200
Proceeds from Income Tax Refunds	136,800	9,300	$ 2,600
Cash paid for income taxes	178,400	79,600	113,400
Operating Loss Carryforwards	1,771,000	647,000
Operating Loss Carryforwards With Expiration Dates	10,500
Unrecognized Tax Benefits	296,213	274,661	279,801	$ 245,636
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	30,600
Unrecognized Tax Benefits, Interest on Income Taxes Expense	8,200	(36,600)	$ 7,600
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	$ 28,800	$ 20,700