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Earnings per Share (Schedule Of Reconciliation Of Basic Earnings Per Share To Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net loss	$ (30,244)	$ (2,272)
Weighted average common shares outstanding Class A, B and C (in shares)	443,052	439,360
Basic net loss per share of Class A, B and C common stock (in dollars per share)	$ (0.07)	$ (0.01)
Diluted net loss per share of Class A, B and C common stock (in dollars per share)	$ (0.07)	$ (0.01)

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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