CONDENSED CONSOLIDATED BALANCE SHEETS - UNAUDITED - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 181,457	$ 205,635
Short-term investments	6,133	28,000
Total cash, cash equivalents and short-term investments	187,590	233,672
Settlement and merchant reserve assets	163,145	186,267
Trade accounts receivable:
Billed, net of allowance of $4,924 and $4,250	238,368	244,317
Unbilled	42,379	35,802
Income taxes receivable	8,617	6,414
Other current assets	46,676	41,727
Total current assets	686,775	748,199
Non-current assets:
Property and equipment, net of depreciation of $110,862 and $105,073	70,803	73,580
Operating lease right-of-use assets	71,850	86,034
Intangible assets	83,714	86,964
Goodwill	319,034	321,330
Customer contract costs, net of amortization of $50,700 and $39,893	47,025	46,618
Deferred income taxes	8,755	8,584
Other assets	15,378	15,840
Total non-current assets	616,559	638,950
Total assets	1,303,334	1,387,149
Current liabilities:
Current portion of long-term debt	252,500	237,500
Operating lease liabilities	22,832	23,270
Customer deposits	40,324	43,546
Trade accounts payable	35,193	35,397
Accrued employee compensation	61,516	91,115
Settlement and merchant reserve liabilities	161,782	185,276
Deferred revenue	51,990	53,748
Income taxes payable	800	398
Other current liabilities	19,940	24,852
Total current liabilities	646,877	695,102
Non-current liabilities:
LLong-term debt, net of unamortized discounts of $3,218 and $3,406	135,532	137,219
Operating lease liabilities	64,750	70,068
Deferred revenue	16,156	19,599
Income taxes payable	4,148	4,058
Deferred income taxes	7,729	7,752
Other non-current liabilities	13,970	13,107
Total non-current liabilities	242,285	251,803
Total liabilities	889,162	946,905
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; 32,560 and 32,495 shares outstanding	709	705
Additional paid-in capital	472,078	488,303
Treasury stock, at cost; 36,979 and 36,7130 shares	(946,102)	(930,106)
Accumulated other comprehensive income (loss):
Unrealized gains on short-term investments, net of tax	(8)	(6)
Cumulative foreign currency translation adjustments	(39,529)	(38,347)
Accumulated earnings	923,389	916,060
Total CSG stockholders' equity	410,537	436,609
Noncontrolling interest	3,635	3,635
Total stockholders' equity	414,172	440,244
Total liabilities and stockholders' equity	1,303,334	1,387,149
Software
Non-current assets:
Intangible assets	29,234	29,757
Acquired customer contracts
Non-current assets:
Intangible assets	$ 54,480	$ 57,207