Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Allowance for doubtful accounts	$ 521	$ 500
Accumulated depreciation	15,128	13,038
Accumulated amortization	44,196	39,945
Current portion of long-term debt, net of financing fees		511
Non current portion of long-term debt, net of financing fees	1,464	1,618
Customer Relationships
Accumulated amortization	$ 39,309	$ 35,877
Class A
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	25,821,224	25,682,669
Common stock, shares outstanding	25,821,224	25,682,669