Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 27,734	$ 44,984
Accounts receivable, net	115,089	122,446
Prepaid expenses	5,316	4,663
Other current assets	6,497	5,711
Total current assets	154,636	177,804
Property and equipment, net	6,977	6,677
Operating lease right-of-use assets	20,767
Goodwill	327,931	327,992
Intangible assets, net	44,185	48,092
Other non-current assets	13,440	9,979
Total assets	567,936	570,544
Current liabilities:
Accounts payable	12,661	24,437
Other current liabilities	42,166	50,386
Total current liabilities	54,827	74,823
Long-term debt, net	121,196	120,067
Operating lease liabilities	14,792
Other non-current liabilities	27,308	21,970
Total liabilities	218,123	216,860
Stockholders’ equity:
Preferred stock (par value $.001 per share; 8,000,000 authorized; no shares issued or outstanding as of March 31, 2019 and December 31, 2018)	0	0
Common stock (par value $.001 per share; 100,000,000 authorized; 48,811,776 shares issued and 31,599,081 shares outstanding as of March 31, 2019; 48,429,299 shares issued and 31,770,888 shares outstanding as of December 31, 2018)	49	48
Additional paid-in capital	441,541	437,250
Accumulated other comprehensive loss	(2,417)	(2,588)
Treasury stock, at cost (17,212,695 shares as of March 31, 2019; 16,658,411 shares as of December 31, 2018)	(249,036)	(233,676)
Retained earnings	159,676	152,650
Total stockholders’ equity	349,813	353,684
Total liabilities and stockholders’ equity	$ 567,936	$ 570,544