Fair Value of Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Significant Unobservable Inputs (Level 3) | Carrying Value
Financial Assets
Other investments in SPV related to lending activities	$ 33,338	$ 26,871
Significant Unobservable Inputs (Level 3) | Fair Value
Financial Assets
Other investments in SPV related to lending activities	42,452	42,156
Significant Other Observable Inputs (Level 2) | Carrying Value
Financial Liabilities
Financial Liabilities	262,500	262,500
Significant Other Observable Inputs (Level 2) | Carrying Value | Senior Notes | Senior Notes - MHLA – 6.625%
Financial Liabilities
Financial Liabilities	110,000	110,000
Significant Other Observable Inputs (Level 2) | Carrying Value | Senior Notes | Senior Notes - MHNC – 7.75%
Financial Liabilities
Financial Liabilities	152,500	152,500
Significant Other Observable Inputs (Level 2) | Fair Value
Financial Liabilities
Financial Liabilities	221,784	223,527
Significant Other Observable Inputs (Level 2) | Fair Value | Senior Notes | Senior Notes - MHLA – 6.625%
Financial Liabilities
Financial Liabilities	87,340	86,460
Significant Other Observable Inputs (Level 2) | Fair Value | Senior Notes | Senior Notes - MHNC – 7.75%
Financial Liabilities
Financial Liabilities	$ 134,444	$ 137,067