Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 34,282	$ 44,984
Accounts receivable, net	122,797	122,446
Prepaid expenses	4,991	4,663
Other current assets	7,896	5,711
Total current assets	169,966	177,804
Property and equipment, net	10,394	6,677
Operating lease right-of-use assets	28,101
Goodwill	335,983	327,992
Intangible assets, net	45,104	48,092
Other non-current assets	15,242	9,979
Total assets	604,790	570,544
Current liabilities:
Accounts payable	15,914	24,437
Other current liabilities	58,108	50,386
Total current liabilities	74,022	74,823
Long-term debt, net	122,338	120,067
Operating lease liabilities	20,628
Other non-current liabilities	28,655	21,970
Total liabilities	245,643	216,860
Stockholders’ equity:
Preferred stock (par value $.001 per share; 8,000,000 authorized; no shares issued or outstanding as of June 30, 2019 and December 31, 2018)	0	0
Common stock (par value $.001 per share; 100,000,000 authorized; 48,901,232 shares issued and 31,526,154 shares outstanding as of June 30, 2019; 48,429,299 shares issued and 31,770,888 shares outstanding as of December 31, 2018)	49	48
Additional paid-in capital	447,146	437,250
Accumulated other comprehensive loss	(2,351)	(2,588)
Treasury stock, at cost (17,375,078 shares as of June 30, 2019; 16,658,411 shares as of December 31, 2018)	(253,901)	(233,676)
Retained earnings	168,204	152,650
Total stockholders’ equity	359,147	353,684
Total liabilities and stockholders’ equity	$ 604,790	$ 570,544