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Business, Basisi of Presentation and Significant Accounting Policies (Income Taxes) (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Subsequent Event [Line Items]
U.S. corporate tax rate, percent			35.00%	35.00%	35.00%
Change in enacted tax rate, non-cash tax benefit (in dollars)	$ 120,100,000		$ 120,100,000
Provision for U.S. income taxes on unremitted foreign earnings	$ 0		$ 0
Subsequent Event [Member]
Subsequent Event [Line Items]
U.S. corporate tax rate, percent		21.00%