Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 6,309	$ 35,615	$ 54,528
Additions	0	3,182	16,284
Deductions	(6,309)	(32,488)	(35,197)
Balance at End of Year	0	6,309	35,615
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	31,652
Additions		651	9,328
Deductions		(8,283)	(33,348)
Balance at End of Year		0	7,632
Reserve for program development costs [Member] | Two Funds Not Yet Offering
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Deductions			(1,300)
Reserve for program development costs [Member] | CCPT V
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Deductions			(32,000)
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	7,576
Additions	0	2,531	6,956
Deductions	(6,309)	(8,905)	(1,849)
Balance at End of Year	0	6,309	12,683
Allowance for doubtful accounts and other reserves [Member] | Discontinued Operations
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year		1,000
Balance at End 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	15,300
Additions		0	0
Deductions		(15,300)	0
Balance at End of Year		$ 0	$ 15,300