Borrowings - Obligations Under Capital Lease (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Leases
Average balance	$ 17,272	$ 10,135	$ 18,367	$ 8,406
Weighted average interest rate	2.70%	4.39%	3.05%	4.39%
Total interest expense	$ 104	$ 136	$ 271	$ 202
Unpaid principal balance	$ 16,749		$ 16,749		$ 20,810
Weighted average interest rate	2.70%		2.70%		3.74%
Furniture, fixtures, equipment and building improvements pledged to creditors	$ 6,670		$ 6,670		$ 20,406
Capitalized software pledged to creditors	9,730		9,730		$ 12,192
Maximum
Leases
Maximum daily amount outstanding	$ 18,145	$ 28,295	$ 20,810	$ 28,295