CONDENSED CONSOLIDATED BALANCE SHEETS - UNAUDITED - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 107,744	$ 156,548
Short-term investments	23,529	26,109
Total cash, cash equivalents and short-term investments	131,273	182,657
Settlement assets	122,624	169,327
Trade accounts receivable:
Billed, net of allowance of $3,888 and $3,735	260,713	244,058
Unbilled	35,557	33,450
Income taxes receivable	5,435	4,297
Other current assets	42,702	35,293
Total current assets	598,304	669,082
Non-current assets:
Property and equipment, net of depreciation of $97,700 and $98,029	80,754	84,429
Operating lease right-of-use assets	107,009	94,847
Intangible assets	85,974	87,631
Goodwill	262,833	259,164
Client contract costs, net of amortization of $34,644 and $31,526	51,967	50,746
Deferred income taxes	8,653	9,392
Other assets	28,963	27,739
Total non-current assets	626,153	613,948
Total assets	1,224,457	1,283,030
Current liabilities:
Current portion of long-term debt	11,250	10,313
Operating lease liabilities	22,085	22,442
Client deposits	36,717	38,687
Trade accounts payable	37,960	32,704
Accrued employee compensation	46,448	77,527
Settlement liabilities	121,416	168,342
Deferred revenue	50,320	45,094
Income taxes payable	1,155	2,806
Other current liabilities	17,452	20,778
Total current liabilities	344,803	418,693
Non-current liabilities:
Long-term debt, net of unamortized discounts of $8,897 and $10,053	344,853	346,509
Operating lease liabilities	91,620	78,936
Deferred revenue	18,575	18,552
Income taxes payable	2,651	2,543
Deferred income taxes	15,786	6,376
Other non-current liabilities	19,338	14,759
Total non-current liabilities	492,823	467,675
Total liabilities	837,626	886,368
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; 33,075 and 32,891 shares outstanding	699	696
Additional paid-in capital	452,524	454,663
Treasury stock, at cost; 35,498 and 35,356 shares	(874,225)	(867,817)
Accumulated other comprehensive income (loss):
Unrealized gain (loss) on short-term investments, net of tax	(8)	16
Cumulative foreign currency translation adjustments	(54,603)	(39,519)
Accumulated earnings	862,444	848,623
Total stockholders' equity	386,831	396,662
Total liabilities and stockholders' equity	1,224,457	1,283,030
Software
Non-current assets:
Intangible assets	30,645	32,526
Acquired client contracts
Non-current assets:
Intangible assets	$ 55,329	$ 55,105