Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 2,448	$ 10,113
Accounts receivable, net	108,090	103,702
Prepaid expenses	4,550	3,353
Other current assets	1,776	5,331
Total current assets	116,864	122,499
Property and equipment, net	7,425	8,888
Goodwill	304,583	275,205
Intangible assets, net	55,282	45,115
Other non-current assets	6,435	4,869
Total assets	490,589	456,576
Current liabilities:
Accounts payable	11,992	18,416
Other current liabilities	28,052	27,637
Total current liabilities	40,044	46,053
Long-term debt	65,000	32,000
Other non-current liabilities	19,029	19,058
Total liabilities	124,073	97,111
Stockholders' equity:
Common stock (par value $0.001 per share; 100,000,000 shares authorized, 47,023,531 shares issued and 33,445,194 shares outstanding as of September 30, 2017; 50,000,000 shares authorized, 45,895,086 shares issued and 33,865,688 shares outstanding as of December 31, 2016)	47	46
Additional paid-in capital	400,405	379,094
Accumulated other comprehensive loss	(2,023)	(2,743)
Treasury stock, at cost (13,578,337 shares as of September 30, 2017; 12,029,398 shares as of December 31, 2016)	(153,569)	(126,442)
Retained earnings	121,656	109,510
Total stockholders' equity	366,516	359,465
Total liabilities and stockholders' equity	$ 490,589	$ 456,576