CONDENSED CONSOLIDATED BALANCE SHEETS - UNAUDITED - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 160,630	$ 139,277
Short-term investments	11,337	23,603
Total cash, cash equivalents and short-term investments	171,967	162,880
Settlement assets	112,760	124,627
Trade accounts receivable:
Billed, net of allowance of $3,356 and $3,115	242,616	235,827
Unbilled	37,451	37,227
Income taxes receivable	4,204	6,720
Other current assets	38,467	32,286
Total current assets	607,465	599,567
Non-current assets:
Property and equipment, net of depreciation of $96,520 and $93,278	84,230	81,813
Operating lease right-of-use assets	92,949
Intangible assets	88,891	101,856
Goodwill	253,050	255,816
Client contract costs, net of amortization of $32,109 and $43,051	42,902	37,289
Deferred income taxes	9,822	11,087
Other assets	27,848	26,934
Total non-current assets	599,692	514,795
Total assets	1,207,157	1,114,362
Current liabilities:
Current portion of long-term debt	9,375	7,500
Operating lease liabilities	22,888
Client deposits	38,010	36,889
Trade accounts payable	39,534	45,386
Accrued employee compensation	68,343	61,107
Settlement liabilities	111,522	123,613
Deferred revenue	46,970	40,236
Income taxes payable	1,236	218
Other current liabilities	19,201	35,442
Total current liabilities	357,079	350,391
Non-current liabilities:
Long-term debt, net of unamortized discounts of $11,197 and $14,549	348,178	352,326
Operating lease liabilities	76,574
Deferred revenue	13,879	17,527
Income taxes payable	2,704	2,284
Deferred income taxes	12,822	8,205
Other non-current liabilities	13,885	22,605
Total non-current liabilities	468,042	402,947
Total liabilities	825,121	753,338
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; 32,979 and 33,158 shares outstanding	696	693
Common stock warrants; 439 warrants vested; 1,425 issued	9,082	9,082
Additional paid-in capital	451,606	441,417
Treasury stock, at cost; 35,265 and 34,779 shares	(862,917)	(842,360)
Accumulated other comprehensive income (loss):
Unrealized gains on short-term investments, net of tax	26	2
Cumulative foreign currency translation adjustments	(49,805)	(42,937)
Accumulated earnings	833,348	795,127
Total stockholders' equity	382,036	361,024
Total liabilities and stockholders' equity	1,207,157	1,114,362
Software
Non-current assets:
Intangible assets	31,335	36,400
Acquired client contracts
Non-current assets:
Intangible assets	$ 57,556	$ 65,456