CONDENSED CONSOLIDATED BALANCE SHEETS - UNAUDITED - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 174,489	$ 156,548
Short-term investments	37,605	26,109
Total cash, cash equivalents and short-term investments	212,094	182,657
Settlement assets	117,452	169,327
Trade accounts receivable:
Billed, net of allowance of $3,730 and $3,735	225,117	244,058
Unbilled	36,977	33,450
Income taxes receivable	3,341	4,297
Other current assets	42,205	35,293
Total current assets	637,186	669,082
Non-current assets:
Property and equipment, net of depreciation of $100,661 and $98,029	83,199	84,429
Operating lease right-of-use assets	115,726	94,847
Intangible assets	78,994	87,631
Goodwill	266,636	259,164
Client contract costs, net of amortization of $39,206 and $31,526	45,038	50,746
Deferred income taxes	9,641	9,392
Other assets	35,396	27,739
Total non-current assets	634,630	613,948
Total assets	1,271,816	1,283,030
Current liabilities:
Current portion of long-term debt	13,125	10,313
Operating lease liabilities	22,580	22,442
Client deposits	34,387	38,687
Trade accounts payable	36,617	32,704
Accrued employee compensation	59,534	77,527
Settlement liabilities	116,032	168,342
Deferred revenue	52,835	45,094
Income taxes payable	3,664	2,806
Other current liabilities	18,612	20,778
Total current liabilities	357,386	418,693
Non-current liabilities:
Long-term debt, net of unamortized discounts of $6,543 and $10,053	339,707	346,509
Operating lease liabilities	101,262	78,936
Deferred revenue	18,884	18,552
Income taxes payable	2,734	2,543
Deferred income taxes	10,388	6,376
Other non-current liabilities	31,528	14,759
Total non-current liabilities	504,503	467,675
Total liabilities	861,889	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; 33,125 and 32,891 shares outstanding	701	696
Additional paid-in capital	462,775	454,663
Treasury stock, at cost; 35,646 and 35,356 shares	(880,162)	(867,817)
Accumulated other comprehensive income (loss):
Unrealized gains on short-term investments, net of tax	30	16
Cumulative foreign currency translation adjustments	(44,265)	(39,519)
Accumulated earnings	870,848	848,623
Total stockholders' equity	409,927	396,662
Total liabilities and stockholders' equity	1,271,816	1,283,030
Software
Non-current assets:
Intangible assets	28,769	32,526
Acquired client contracts
Non-current assets:
Intangible assets	$ 50,225	$ 55,105