Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 329,182	$ 305,052
Restricted cash	330	1,147
Accounts receivable, less allowance for doubtful accounts of $403 and $420 at December 31, 2012 and March 31, 2013, respectively	32,708	22,924
Deferred tax assets - current	11,855	11,855
Prepaid expenses and other current assets	8,068	6,309
Total current assets	382,143	347,287
Restricted cash, net of current portion		2,432
Property and equipment, net	24,947	24,777
Goodwill	94,827	94,827
Acquired intangible assets, net	46,223	47,506
Other assets	1,834	1,938
Total assets	549,974	518,767
Current liabilities:
Accounts payable and accrued expenses	37,487	42,034
Customer obligations	259,753	249,801
Short-term contingent payment	7,001	6,818
Other current liabilities	3,499	2,726
Total current liabilities	307,740	301,379
Long-term debt	44,390	44,371
Long-term contingent payment, net of current portion	11,963	11,772
Deferred tax liability	2,346	2,450
Other non-current liability	2,127	2,384
Total liabilities	368,566	362,356
Stockholders' Equity:
Common stock, $0.001 par value. Authorized 1,000,000 shares; issued 31,771 shares at December 31, 2012 and 33,483 shares at March 31, 2013	34	32
Treasury stock at cost 200 shares at December 31, 2012 and March 31, 2013	(546)	(546)
Additional paid-in capital	241,405	221,046
Accumulated deficit	(59,485)	(64,121)
Total stockholders' equity	181,408	156,411
Total liabilities and stockholders' equity	$ 549,974	$ 518,767