Nature of Business, Interim Financial Data and Basis of Presentation (Schedule of Assets Held for Sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale	$ 75,000	$ 87,000
DC Land
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale	75,000	75,000
WABC Sale
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale		12,000
FCC license
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale		4,573
FCC license | DC Land
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale	0	0
FCC license | WABC Sale
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale		4,573
Other intangibles, net
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale		373
Other intangibles, net | DC Land
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale	0	0
Other intangibles, net | WABC Sale
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale		373
Property and equipment, net
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale		82,054
Property and equipment, net | DC Land
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale	$ 75,000	75,000
Property and equipment, net | WABC Sale
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale		$ 7,054