Debt Obligations - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2020	Mar. 31, 2019	Mar. 13, 2020	Feb. 28, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt		$ 5,800,000	$ 0
Less: Preferred dividends, deemed dividends and repurchase gains		400,000	(1,200,000)
Interest cost relating to amortization of discount		$ 2,000,000.0	$ 1,600,000
Minimum
Debt Instrument [Line Items]
Capital leases rate (as a percent)		2.00%
Maximum
Debt Instrument [Line Items]
Capital leases rate (as a percent)		11.50%
11.50% Senior Secured Notes, due 2021
Debt Instrument [Line Items]
Interest rate (as a percent)	11.50%	11.50%
Outstanding debt	$ 76,900,000	$ 76,900,000
Gain (loss) on extinguishment of debt	$ (5,400,000)
Convertible notes, conversion ratio	1.045
Secured Indenture
Debt Instrument [Line Items]
Interest cost relating to amortization of discount		100,000
Revolving Credit Agreement
Debt Instrument [Line Items]
Face amount	$ 15,000,000.0	$ 15,000,000.0		$ 15,000,000.0	$ 15,000,000.0
Gain (loss) on extinguishment of debt	$ (400,000)
Energy | 5.00% Term Loan due in 2022
Debt Instrument [Line Items]
Interest rate (as a percent)	5.00%	5.00%
Outstanding debt	$ 10,900,000	$ 10,900,000				$ 11,200,000
Energy | 4.50% Note due in 2022
Debt Instrument [Line Items]
Interest rate (as a percent)	4.50%	4.50%
Outstanding debt	$ 9,900,000	$ 9,900,000				10,200,000
Energy | LIBOR plus 3.0% Term Loan due in 2023
Debt Instrument [Line Items]
Outstanding debt	26,300,000	$ 26,300,000				27,100,000
Energy | LIBOR plus 3.0% Term Loan due in 2023 | LIBOR | ANG
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)		3.00%
Broadcasting | Tranche A Senior Notes, Due October 2020
Debt Instrument [Line Items]
Face amount					$ 39,300,000
Outstanding debt	$ 39,300,000	$ 39,300,000				36,200,000
Broadcasting | 10.50% Note due 2020
Debt Instrument [Line Items]
Interest rate (as a percent)	10.50%	10.50%
Outstanding debt	$ 42,500,000	$ 42,500,000				42,500,000
Non-Operating Corporate | 11.50% Senior Secured Notes, due 2021
Debt Instrument [Line Items]
Interest rate (as a percent)	11.50%	11.50%
Outstanding debt	$ 393,000,000.0	$ 393,000,000.0				470,000,000.0
Non-Operating Corporate | 7.50% Convertible Senior Notes, due 2022
Debt Instrument [Line Items]
Interest rate (as a percent)	7.50%	7.50%
Outstanding debt	$ 55,000,000.0	$ 55,000,000.0				55,000,000.0
Non-Operating Corporate | LIBOR plus 6.75% Line of Credit(1)
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	6.75%	6.75%
Outstanding debt	$ 0	$ 0				$ 15,000,000.0