Basis of Presentation and Significant Accounting Policies Dreamcatcher (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
	Dec. 27, 2013	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 29, 2015	Dec. 31, 2016		Dec. 31, 2015		Dec. 28, 2014
Variable Interest Entity [Line Items]
Total operating revenues		$ 529,624	$ 470,038	$ 479,796	$ 468,472	$ 478,009	$ 442,975	$ 458,416	$ 422,567	$ 1,947,930	[1]	$ 1,801,967	[1]	$ 1,780,625	[1]
Total operating profit		$ 113,206	$ 234,170	$ 56,206	$ 29,992	$ (396,926)	$ 45,036	$ 25,148	$ 57,407	433,574	[1],[2]	(269,335)	[1],[2]	304,824	[1],[2]
Dreamcatcher | Dreamcatcher Stations
Variable Interest Entity [Line Items]
Business Combination, Consideration Transferred	$ (27,000)
Variable Interest Entity, Primary Beneficiary | Dreamcatcher Stations
Variable Interest Entity [Line Items]
Total operating revenues										73,000		65,000		67,000
Total operating profit										$ 16,000		$ 12,000		$ 13,000
Variable Interest Entity, Primary Beneficiary | Dreamcatcher
Variable Interest Entity [Line Items]
Variable Interest Entity, Financial or Other Support, Amount	$ 200

[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.