Basis Of Presentation And Significant Accounting Policies (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Investment Holdings [Line Items]
Operating revenues	[1]	$ 439,910	$ 468,472
Operating profit	[1],[2]	(15,232)	29,992
Variable Interest Entity, Primary Beneficiary | Dreamcatcher Stations
Investment Holdings [Line Items]
Operating revenues		17,000	17,000
Operating profit		$ 2,000	$ 3,000

[1] (1)See Note 2 for the disclosures of operating revenues and operating profit included in discontinued operations for the historical periods.

[2] (2)Operating profit (loss) for each segment excludes income and loss on equity investments, interest and dividend income, interest expense, non-operating items, reorganization costs and income taxes.