Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 898,426	$ 779,345
Restricted cash	333	332
Short-term investments	222,205	195,534
Receivables, net	101,297	107,547
Prepaid expenses and other current assets	23,662	29,271
Total current assets	1,245,923	1,112,029
Property and equipment, net	76,920	68,742
Goodwill	297,409	297,409
Acquired intangible assets, net	130,095	155,369
Deferred tax assets, net	1,482	10,143
Other assets	33,324	8,291
Total assets	1,785,153	1,651,983
Current liabilities:
Accounts payable and accrued expenses	99,854	89,977
Customer obligations	762,100	695,368
Other current liabilities	1,757	628
Total current liabilities	863,711	785,973
Long-term debt, net of financing costs	244,693	244,915
Other non-current liabilities	11,608	8,845
Total liabilities	1,120,012	1,039,733
Commitments and contingencies (Note 15)
Stockholders’ Equity:
Common stock, $0.001 par value (authorized 1,000,000 shares; 40,333 shares issued and 39,853 shares outstanding at December 31, 2018; 40,251 shares issued and 39,771 shares outstanding at December 31, 2017)	41	41
Additional paid-in capital	582,521	562,131
Treasury stock at cost (480 shares at December 31, 2018 and 2017)	(22,309)	(22,309)
Accumulated other comprehensive loss	(754)	(354)
Retained earnings	105,642	72,741
Total stockholders’ equity	665,141	612,250
Total liabilities and stockholders’ equity	$ 1,785,153	$ 1,651,983