Income Taxes - Income Tax Reconciliation from Continuing Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	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
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent									35.00%	35.00%	35.00%
Income (loss) from continuing operations before income taxes	$ 114,007	$ 227,710	$ 62,228	$ 30,297	$ (402,407)	$ 48,346	$ 5,420	$ 59,222	$ 434,242	$ (289,419)	$ 760,885
Federal income taxes at 35%									151,985	(101,297)	266,310
State and local income taxes, net of federal tax benefit									17,474	3,195	32,072
Domestic production activities deduction									(6,807)	(6,554)	(7,910)
Non-deductible goodwill									0	133,350	0
Income tax settlements and other adjustments, net									179,558	(7,842)	(1,801)
Tax rate change due to Publishing Spin-off									0	0	(10,810)
Other, net									4,992	5,066	6,405
Income Tax Expense (Benefit)	$ 43,280	$ 73,871	$ 214,856	$ 15,195	$ (13,829)	$ 14,510	$ 2,624	$ 22,613	$ 347,202	$ 25,918	$ 284,266
Effective tax rate									80.00%	(9.00%)	37.40%