Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jan. 01, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ (57,480)	$ (555,277)	$ (69,408)	$ (673,992)
Loss from continuing operations before income tax	$ 753,500	165,465	$ 930,851	372,943
Deferred tax benefit from outside basis difference		644,000		644,000
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net long-term deferred tax asset					$ 479,700
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-16 | Prepaid Expenses and Other Current Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Current deferred charge						$ (24,100)
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-16 | Other Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Non-current deferred charge						$ (348,800)
Outside Basis Difference
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Valuation allowance		$ 196,000		$ 196,000