Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 6,309	$ 35,615
Additions	0	3,182
Deductions	(6,309)	(32,488)
Balance at End of Year	0	6,309
Reserve for program development costs [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	0	7,632
Additions		651
Deductions		(8,283)
Balance at End of Year		0
Allowance for doubtful accounts and other reserves [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	6,309	12,683
Additions	0	2,531
Deductions	(6,309)	(8,905)
Balance at End of Year	0	6,309
Allowance for doubtful accounts and other reserves [Member] | Discontinued Operations [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year		1,000
Unsecured note reserve [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 0	15,300
Additions		0
Deductions		(15,300)
Balance at End of Year		$ 0