Consolidated Balance Sheets (unaudited) (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 3,232	$ 2,512
Loans held-for-sale	$ 71,378	$ 225,013
Common units, units issued (in shares)	24,929,253	25,023,128
Common units, units outstanding (in shares)	24,929,253	25,023,128
Common units held in treasury (in shares)	12,647,864	12,647,864
Common units held in treasury, cost	$ 198,781	$ 198,781