Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Accrued expenses	$ (27,862)	$ (32,120)
Deferred compensation	(59,815)	(85,524)
Net operating loss carry-forwards	(197,396)	(145,414)
Investments	(91,828)	(129,113)
State taxes and interest	(31,101)	(52,999)
Property and equipment	(27,034)	(34,267)
Other	(13,915)	(32,310)
Total deferred tax assets:	(448,951)	(511,747)
Deferred tax liabilities:
Intangible assets	179,764	157,675
Programs and program licenses	1,823	54,908
Other	6,992	5,544
Total deferred tax liabilities:	188,579	218,127
Valuation allowance for deferred tax assets	155,513	118,329
Net deferred tax asset	$ (104,859)	$ (175,291)