Spectrum repacking reimbursements and other, net - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Unusual or Infrequent Item, or Both [Line Items]
Reimbursement from spectrum repacking	$ 4,942,000	$ 13,180,000	$ 16,974,000
IImpairment of long-lived assets to be disposed of operating assets	0	3,225,000	9,063,000
Asset impairment charges	1,100,000		9,100,000
Gain on sale of real estate			2,900,000
Impairment of indefinite-lived intangible assets	0	0	0
Contract termination and other costs related to national sales	$ 1,540,000	0	$ 5,456,000
Licensing Agreements
Unusual or Infrequent Item, or Both [Line Items]
Impairment of indefinite-lived intangible assets		1,100,000
Trade Names
Unusual or Infrequent Item, or Both [Line Items]
Impairment of indefinite-lived intangible assets		$ 2,100,000