Quarterly report pursuant to Section 13 or 15(d)

Notes Payable - Narrative (Details)

Notes Payable - Narrative (Details) - USD ($)						1 Months Ended				3 Months Ended		6 Months Ended
Notes Payable - Narrative (Details) - USD ($)	Jun. 22, 2018	May 22, 2018	Dec. 12, 2017	Nov. 21, 2017	Apr. 21, 2017	Jul. 31, 2018	Jun. 30, 2018	May 31, 2018	Feb. 28, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Line of Credit Facility [Line Items]
Notes payable, debt issuance costs							$ 5,538,000			$ 5,538,000		$ 5,538,000		$ 3,412,000
Commissions										$ 180,381,000	$ 132,975,000	$ 343,667,000	$ 263,025,000
6.5% Senior notes \| Senior Notes
Line of Credit Facility [Line Items]
Face amount of debt			$ 76,569,000	$ 72,500,000
Interest rate				6.50%			6.50%			6.50%		6.50%
Redemption percentage				100.00%
Option to exercise amount			4,069,000
Notes payable, debt issuance costs			3,313,000
Commissions			$ 1,187,000
Debt sold									$ 25,000,000			$ 6,198,000
Commissions receivable, percentage				2.00%
7% Senior Notes \| Senior Notes
Line of Credit Facility [Line Items]
Face amount of debt	$ 41,412,000	$ 40,000,000
Interest rate		7.00%					7.00%			7.00%		7.00%
Redemption percentage		100.00%
Option to exercise amount	1,412,000
Notes payable, debt issuance costs	1,656,000
Commissions	$ 527,000
Debt sold							$ 25,000,000					$ 754,000
Commissions receivable, percentage		2.00%
Securities America \| Amended and Restated Loan Agreement \| Term Loan
Line of Credit Facility [Line Items]
Face amount of debt					$ 8,000,000
Interest rate					5.75%
Revolving Credit Facility
Line of Credit Facility [Line Items]
Availability under revolving credit facility							40,000,000			$ 40,000,000		40,000,000
Face amount of debt							40,000,000			40,000,000		40,000,000
Revolving Credit Facility \| Securities America \| Amended and Restated Loan Agreement \| Line of Credit
Line of Credit Facility [Line Items]
Availability under revolving credit facility							1,000,000			1,000,000		1,000,000
Basis spread on variable rate					2.25%
Fair Value \| Level 2
Line of Credit Facility [Line Items]
Notes payable, net							$ 140,490,000			$ 140,490,000		$ 140,490,000		$ 99,129,000
NFS Forgivable Loan
Line of Credit Facility [Line Items]
Term								6 years
Forgiveness, principal								$ 2,222,000
Subsequent Event
Line of Credit Facility [Line Items]
Extinguishment of debt						$ 14,978,000