Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 19,544	$ 70,728
Accounts receivable, net	127,907	129,118
Prepaid expenses	5,679	4,647
Other current assets	6,226	7,404
Total current assets	159,356	211,897
Property and equipment, net	12,488	12,170
Operating lease right-of-use assets	35,571	27,748
Goodwill	417,403	335,564
Intangible assets, net	75,798	37,953
Other non-current assets	14,838	15,160
Total assets	715,454	640,492
Current liabilities:
Accounts payable	16,085	23,081
Other current liabilities	81,098	61,503
Total current liabilities	97,183	84,584
Long-term debt, net	139,044	124,664
Operating lease liabilities	25,175	19,649
Other non-current liabilities	43,999	30,580
Total liabilities	305,401	259,477
Stockholders’ equity:
Preferred stock (par value $0.001 per share; 8,000,000 authorized; no shares issued or outstanding as of June 30, 2020 and December 31, 2019)	0	0
Common stock (par value $0.001 per share; 100,000,000 authorized; 49,972,029 shares issued and 32,272,286 shares outstanding as of June 30, 2020; 49,272,243 shares issued and 31,686,991 shares outstanding as of December 31, 2019)	50	49
Additional paid-in capital	475,147	455,465
Accumulated other comprehensive loss	(3,702)	(2,650)
Treasury stock, at cost (17,699,743 shares as of June 30, 2020; 17,585,252 shares as of December 31, 2019)	(266,485)	(261,624)
Retained earnings	205,043	189,775
Total stockholders’ equity	410,053	381,015
Total liabilities and stockholders’ equity	$ 715,454	$ 640,492