CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 139,277	$ 122,243
Short-term investments	23,603	139,117
Total cash, cash equivalents and short-term investments	162,880	261,360
Settlement assets	124,627
Trade accounts receivable:
Billed, net of allowance of $3,115 and $4,149	235,827	219,531
Unbilled	37,227	31,187
Income taxes receivable	6,720	13,839
Other current assets	32,286	28,349
Total current assets	599,567	554,266
Non-current assets:
Property and equipment, net of depreciation of $93,278 and $123,126	81,813	44,651
Intangible assets	101,856
Goodwill	255,816	210,080
Client contract costs, net of amortization of $43,051 and zero	37,289
Deferred income taxes	11,087	14,057
Other assets	26,934	10,948
Total non-current assets	514,795	350,268
Total assets	1,114,362	904,534
Current liabilities:
Current portion of long-term debt	7,500	22,500
Client deposits	36,889	31,053
Trade accounts payable	45,386	38,420
Accrued employee compensation	61,107	62,984
Settlement liabilities	123,613
Deferred revenue	40,236	41,885
Income taxes payable	218	1,216
Other current liabilities	35,442	24,535
Total current liabilities	350,391	222,593
Non-current liabilities:
Long-term debt, net of unamortized discounts of $14,549 and $18,264	352,326	309,236
Deferred revenue	17,527	12,346
Income taxes payable	2,284	2,415
Deferred income taxes	8,205	4,584
Other non-current liabilities	22,605	10,614
Total non-current liabilities	402,947	339,195
Total liabilities	753,338	561,788
Stockholders' equity:
Preferred stock, par value $.01 per share; 10,000 shares authorized; zero shares issued and outstanding
Common stock, par value $.01 per share; 100,000 shares authorized; 4,460 and 2,702 shares reserved for employee stock purchase plan and stock incentive plans; 33,158 and 33,516 shares outstanding	693	689
Common stock warrants; 439 warrants vested; 1,425 issued	9,082	9,082
Additional paid-in capital	441,417	427,091
Treasury stock, at cost; 34,779 and 34,075 shares	(842,360)	(814,732)
Accumulated other comprehensive income (loss):
Unrealized gain (loss) on short-term investments, net of tax	2	(88)
Cumulative foreign currency translation adjustments	(42,937)	(28,734)
Accumulated earnings	795,127	749,438
Total stockholders' equity	361,024	342,746
Total liabilities and stockholders' equity	1,114,362	904,534
Software
Non-current assets:
Intangible assets	36,400	26,906
Client contracts
Non-current assets:
Intangible assets		$ 43,626
Acquired client contracts
Non-current assets:
Intangible assets	$ 65,456