Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 5,813	$ 9,732
Accounts receivable, net of allowance for doubtful accounts of $724 in 2012 and $1,057 in 2011	69,662	60,892
Prepaid expenses	1,649	1,246
Other current assets	3,717	3,118
Total current assets	80,841	74,988
Property and equipment, net	4,398	3,490
Goodwill	160,936	132,038
Intangible assets, net	17,350	10,128
Other non-current assets	3,669	3,288
Total assets	267,194	223,932
Current liabilities:
Accounts payable	7,959	5,029
Other current liabilities	20,605	18,483
Total current liabilities	28,564	23,512
Long-term debt	2,800
Other non-current liabilities	1,417	1,461
Total liabilities	32,781	24,973
Stockholders' equity:
Common stock (par value $0.001 per share; 50,000,000 shares authorized and 39,024,337 shares issued and 30,825,123 shares outstanding as of December 31, 2012; 36,217,914 shares issued and 28,742,906 shares outstanding as of December 31, 2011)	39	36
Additional paid-in capital	276,201	248,855
Accumulated other comprehensive loss	(306)	(279)
Treasury stock, at cost (8,199,214 shares as of December 31, 2012; 7,475,008 shares as of December 31, 2011)	(62,970)	(54,995)
Retained earnings	21,449	5,342
Total stockholders' equity	234,413	198,959
Total liabilities and stockholders' equity	$ 267,194	$ 223,932