Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 86,686	$ 83,204
Accounts receivable, net	149,718	133,085
Prepaid expenses	6,354	5,575
Other current assets	5,795	4,646
Total current assets	248,553	226,510
Property and equipment, net	12,124	11,902
Operating lease right-of-use assets	35,056	38,539
Goodwill	420,508	427,928
Intangible assets, net	48,937	63,571
Other non-current assets	21,017	17,311
Total assets	786,195	785,761
Current liabilities:
Accounts payable	26,167	25,613
Other current liabilities	87,683	103,267
Total current liabilities	113,850	128,880
Long-term debt, net	188,667	183,624
Operating lease liabilities	25,871	29,098
Other non-current liabilities	45,814	50,081
Total liabilities	374,202	391,683
Stockholders’ equity:
Preferred stock (par value $0.001 per share; 8,000,000 authorized; no shares issued or outstanding as of June 30, 2021 and December 31, 2020)	0	0
Common stock (par value $0.001 per share; 100,000,000 authorized; 50,572,384 shares issued and 32,070,673 shares outstanding as of June 30, 2021; 50,296,453 shares issued and 32,074,094 shares outstanding as of December 31, 2020)	51	50
Additional paid-in capital	470,218	459,866
Accumulated other comprehensive (loss) income	(1,813)	3,746
Treasury stock, at cost (18,501,711 shares as of June 30, 2021; 18,222,359 shares as of December 31, 2020)	(306,270)	(289,225)
Retained earnings	249,807	219,641
Total stockholders’ equity	411,993	394,078
Total liabilities and stockholders’ equity	$ 786,195	$ 785,761