Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies.

Rent Expense Recognized Under Operating Leases

	2018		2017		2016
Rent Expense Recognized Under Operating Leases	$	2,369,183	$	2,463,145	$	2,369,101

Schedule of future minimum rental payments under operating lease agreements

Year ending December 31, 2019	$	1,982,547
Year ending December 31, 2020		1,309,267
Year ending December 31, 2021		687,105
Year ending December 31, 2022		222,656
Year ending December 31, 2023		132,140
Year ending December 31, 2024 and thereafter		65,119
Total	$	4,398,834