Nature of Business, Interim Financial Data and Basis of Presentation (Schedule of Assets Held for Sale) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale	$ 525	$ 87,000
WABC Sale
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale		12,000
DC Land
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale		75,000
FCC license
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale	263	4,573
FCC license | WABC Sale
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
Other intangibles, net
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale	29	373
Other intangibles, net | WABC Sale
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
Property and equipment, net
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale	220	82,054
Property and equipment, net | WABC Sale
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale		7,054
Property and equipment, net | DC Land
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale		75,000
Other assets
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale	$ 13	0
Other assets | WABC Sale
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale		0
Other assets | DC Land
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale		$ 0