CSG Systems International (CSGS) 10-Q 6 May 21 2021 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
Cover [Abstract]
Entity Registrant Name	CSG SYSTEMS INTERNATIONAL, INC.
Entity Central Index Key	0001005757
Document Type	10-Q
Document Period End Date	Mar. 31, 2021
Amendment Flag	false
Entity Small Business	false
Entity Emerging Growth Company	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Trading Symbol	CSGS
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		32,889,346
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	0-27512
Entity Tax Identification Number	47-0783182
Entity Address, Address Line One	6175 S. Willow Drive
Entity Address, Address Line Two	10th Floor
Entity Address, City or Town	Greenwood Village
Entity Address, State or Province	CO
Entity Address, Postal Zip Code	80111
City Area Code	(303)
Local Phone Number	200-2000
Entity Incorporation, State or Country Code	DE
Document Quarterly Report	true
Document Transition Report	false
Title of 12(b) Security	Common Stock, Par Value $0.01 Per Share
Security Exchange Name	NASDAQ
Entity Interactive Data Current	Yes

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - UNAUDITED - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 150,609	$ 188,699
Short-term investments	54,539	51,598
Total cash, cash equivalents and short-term investments	205,148	240,297
Settlement assets	108,578	149,785
Trade accounts receivable:
Billed, net of allowance of $3,718 and $3,628	247,025	226,623
Unbilled	40,789	37,785
Income taxes receivable	2,421	2,167
Other current assets	39,047	41,688
Total current assets	643,008	698,345
Non-current assets:
Property and equipment, net of depreciation of $110,797 and $105,073	81,944	81,759
Operating lease right-of-use assets	106,173	110,756
Intangible assets	71,858	74,465
Goodwill	273,265	272,322
Customer costs, net of amortization of $42,802 and $39,893	47,334	47,238
Deferred income taxes	9,892	10,205
Other assets	41,007	36,910
Total non-current assets	631,473	633,655
Total assets	1,274,481	1,332,000
Current liabilities:
Current portion of long-term debt, net of unamortized discounts of $3,119 and zero	241,881	14,063
Operating lease liabilities	23,309	22,651
Customer deposits	32,565	39,992
Trade accounts payable	32,949	29,834
Accrued employee compensation	71,120	86,289
Settlement liabilities	107,023	148,819
Deferred revenue	55,840	52,357
Income taxes payable	5,797	6,627
Other current liabilities	17,249	19,383
Total current liabilities	587,733	420,015
Non-current liabilities:
Long-term debt, net of unamortized discounts of $1,017 and $5,346	107,733	337,154
Operating lease liabilities	91,028	95,926
Deferred revenue	15,505	17,275
Income taxes payable	2,467	2,436
Deferred income taxes	11,569	5,109
Other non-current liabilities	30,731	31,690
Total non-current liabilities	259,033	489,590
Total liabilities	846,766	909,605
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; 32,963 and 32,713 shares outstanding	704	700
Additional paid-in capital	471,364	470,557
Treasury stock, at cost; 36,122 and 35,980 shares	(900,644)	(894,126)
Accumulated other comprehensive income (loss):
Unrealized gains on short-term investments, net of tax	7	13
Cumulative foreign currency translation adjustments	(31,506)	(31,151)
Accumulated earnings	887,790	876,402
Total stockholders' equity	427,715	422,395
Total liabilities and stockholders' equity	1,274,481	1,332,000
Software
Non-current assets:
Intangible assets	25,585	26,453
Acquired customer contracts
Non-current assets:
Intangible assets	$ 46,273	$ 48,012

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS - UNAUDITED (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Trade accounts receivable-billed, allowance	$ 3,718	$ 3,628
Property and equipment, accumulated depreciation	110,797	105,073
Intangibles, accumulated amortization	251,508	245,614
Customer costs, accumulated amortization	42,802	39,893
Current portion of long-term debt, unamortized discounts	3,119	0
Long-term debt, unamortized discounts	$ 1,017	$ 5,346
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares outstanding	32,963,000	32,713,000
Treasury stock, shares	36,122,000	35,980,000
Software
Intangibles, accumulated amortization	$ 143,662	$ 139,836
Acquired customer contracts
Intangibles, accumulated amortization	$ 107,846	$ 105,778

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - UNAUDITED - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenue	$ 253,119	$ 245,617
Cost of revenue (exclusive of depreciation, shown separately below)	133,542	131,206
Other operating expenses:
Research and development	32,212	30,337
Selling, general and administrative	48,815	44,384
Depreciation	6,113	5,565
Restructuring and reorganization charges	1,060	966
Total operating expenses	221,742	212,458
Operating income	31,377	33,159
Other income (expense):
Interest expense	(3,592)	(4,213)
Amortization of original issue discount	(772)	(730)
Interest and investment income, net	124	529
Other, net	(555)	(69)
Total other	(4,795)	(4,483)
Income before income taxes	26,582	28,676
Income tax provision	(6,951)	(7,162)
Net income	$ 19,631	$ 21,514
Weighted-average shares outstanding:
Basic	31,844	31,994
Diluted	32,146	32,358
Earnings per common share:
Basic	$ 0.62	$ 0.67
Diluted	$ 0.61	$ 0.66

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - UNAUDITED - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 19,631	$ 21,514
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(355)	(15,084)
Unrealized holding losses on short-term investments arising during period	(6)	(24)
Other comprehensive loss, net of tax	(361)	(15,108)
Total comprehensive income, net of tax	$ 19,270	$ 6,406

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - UNAUDITED - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Accumulated Earnings
Balance, beginning of period at Dec. 31, 2019	$ 396,662	$ 696	$ 454,663	$ (867,817)	$ (39,503)	$ 848,623
Balance, beginning of period, shares at Dec. 31, 2019		32,891
Net income	21,514					21,514
Unrealized gain on short-term investments, net of tax	(24)				(24)
Foreign currency translation adjustments	(15,084)				(15,084)
Total comprehensive income	6,406
Repurchase of common stock	(13,965)	$ (2)	(7,555)	(6,408)
Repurchase of common stock, shares		(299)
Issuance of common stock pursuant to employee stock purchase plan	564		564
Issuance of common stock pursuant to employee stock purchase plan, shares		14
Issuance of restricted common stock pursuant to stock-based compensation plans		$ 5	(5)
Issuance of restricted common stock pursuant to stock-based compensation plans, shares		476
Cancellation of restricted common stock issued pursuant to stock-based compensation plans, shares		(7)
Stock-based compensation expense	4,857		4,857
Dividends	(7,693)					(7,693)
Balance, ending of period at Mar. 31, 2020	386,831	$ 699	452,524	(874,225)	(54,611)	862,444
Balance, ending of period, shares at Mar. 31, 2020		33,075
Balance, beginning of period at Dec. 31, 2020	$ 422,395	$ 700	470,557	(894,126)	(31,138)	876,402
Balance, beginning of period, shares at Dec. 31, 2020	32,713	32,713
Net income	$ 19,631					19,631
Unrealized gain on short-term investments, net of tax	(6)				(6)
Foreign currency translation adjustments	(355)				(355)
Total comprehensive income	19,270
Repurchase of common stock	(11,721)	$ (1)	(5,202)	(6,518)
Repurchase of common stock, shares		(252)
Issuance of common stock pursuant to employee stock purchase plan	619		619
Issuance of common stock pursuant to employee stock purchase plan, shares		16
Issuance of restricted common stock pursuant to stock-based compensation plans		$ 5	(5)
Issuance of restricted common stock pursuant to stock-based compensation plans, shares		487
Cancellation of restricted common stock issued pursuant to stock-based compensation plans, shares		(1)
Stock-based compensation expense	5,395		5,395
Dividends	(8,243)					(8,243)
Balance, ending of period at Mar. 31, 2021	$ 427,715	$ 704	$ 471,364	$ (900,644)	$ (31,499)	$ 887,790
Balance, ending of period, shares at Mar. 31, 2021	32,963	32,963

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income	$ 19,631	$ 21,514
Adjustments to reconcile net income to net cash used in operating activities -
Depreciation	6,113	5,565
Amortization	10,737	10,788
Amortization of original issue discount	772	730
Asset impairment	102	259
(Gain)/loss on short-term investments	15	(85)
Deferred income taxes	6,508	9,310
Stock-based compensation	5,395	4,857
Changes in operating assets and liabilities, net of acquired amounts:
Trade accounts receivable, net	(23,874)	(23,304)
Other current and non-current assets and liabilities	(999)	(8,452)
Income taxes payable/receivable	(1,022)	(3,092)
Trade accounts payable and accrued liabilities	(28,101)	(32,455)
Deferred revenue	1,914	7,152
Net cash used in operating activities	(2,809)	(7,213)
Cash flows from investing activities:
Purchases of software, property and equipment	(8,239)	(4,822)
Purchases of short-term investments	(32,304)	(16,037)
Proceeds from sale/maturity of short-term investments	29,340	18,670
Acquisition of and investments in business, net of cash acquired	(648)	(9,991)
Net cash used in investing activities	(11,851)	(12,180)
Cash flows from financing activities:
Proceeds from issuance of common stock	619	564
Payment of cash dividends	(8,635)	(8,277)
Repurchase of common stock	(11,738)	(13,876)
Payments on long-term debt	(2,813)	(1,875)
Net cash used in financing activities	(22,567)	(23,464)
Effect of exchange rate fluctuations on cash	(863)	(5,947)
Net decrease in cash and cash equivalents	(38,090)	(48,804)
Cash and cash equivalents, beginning of period	188,699	156,548
Cash and cash equivalents, end of period	150,609	107,744
Cash paid during the period for -
Interest	5,661	6,194
Income taxes	$ 1,468	$ 857

General

General	3 Months Ended
	Mar. 31, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
General	1. GENERAL We have prepared the accompanying unaudited condensed consolidated financial statements as of March 31, 2021 and December 31, 2020, and for the quarters ended March 31, 2021 and 2020, in accordance with accounting principles generally accepted in the United States of America (“U.S.”) (“GAAP”) for interim financial information, and pursuant to the instructions to Form 10-Q and the rules and regulations of the Securities and Exchange Commission (the “SEC”). Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of our management, all adjustments (consisting only of normal recurring adjustments) considered necessary for a fair presentation of our financial position and operating results have been included. The unaudited Condensed Consolidated Financial Statements (the “Financial Statements”) should be read in conjunction with the Consolidated Financial Statements and notes thereto, together with Management’s Discussion and Analysis of Financial Condition and Results of Operations (“MD&A”), contained in our Annual Report on Form 10-K for the year ended December 31, 2020 (our “2020 10-K”), filed with the SEC. The results of operations for the quarter ended March 31, 2021 are not necessarily indicative of the expected results for the entire year ending December 31, 2021.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Use of Estimates in Preparation of Financial Statements. The preparation of the accompanying Financial Statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of our Financial Statements, and the reported amounts of revenue and expenses during the reporting periods. Actual results could differ from those estimates. Revenue. The majority of our future revenue is related to our revenue management solution customer contracts that include variable consideration dependent upon a series of monthly volumes and/or daily usage of services and have contractual terms ending from 2021 through 2028. Our customer contracts may include guaranteed minimums and fixed monthly or annual fees. As of March 31, 2021, our aggregate amount of the transaction price allocated to the remaining performance obligations is approximately $900 million, which is made up of fixed fee consideration and guaranteed minimums expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied). We expect to recognize approximately 80% of this amount by the end of 2023, with the remaining amount recognized by the end of 2028. We have excluded from this amount variable consideration expected to be recognized in the future related to performance obligations that are unsatisfied. The nature, amount, timing, and uncertainty of our revenue and how revenue and cash flows are affected by economic factors is most appropriately depicted by revenue type, geographic region, and customer vertical. Revenue by type for the first quarters of 2021 and 2020 was as follows (in thousands): Quarter Ended March 31, 2021 2020 Cloud and related solutions $ 227,019 $ 222,220 Software and services 14,779 13,206 Maintenance 11,321 10,191 Total revenue $ 253,119 $ 245,617 We use the location of the customer as the basis of attributing revenue to geographic regions. Revenue by geographic region for the first quarters of 2021 and 2020 , as a percentage of our total revenue, was as follows: Quarter Ended March 31, 2021 2020 Americas (principally the U.S.) 86 % 88 % Europe, Middle East, and Africa 10 % 9 % Asia Pacific 4 % 3 % Total revenue 100 % 100 % We generate our revenue primarily from the global communications markets; however, we serve an expanding group of customers in markets including financial services, healthcare, media and entertainment companies, and government entities. Revenue by customer vertical for the first quarters of 2021 and 2020 , as a percentage of our total revenue, was as follows: Quarter Ended March 31, 2021 2020 Broadband/Cable/Satellite 57 % 58 % Telecommunications 18 % 17 % Other 25 % 25 % Total revenue 100 % 100 % Deferred revenue recognized for the first quarters of 2021and 2020 was $20.1 million and $17.7 million, respectively. Cash and Cash Equivalents. We consider all highly liquid investments with original maturities of three months or less at the date of the purchase to be cash equivalents. As of March 31, 2021 and December 31, 2020, our cash equivalents consist primarily of institutional money market funds, commercial paper, and time deposits held at major banks. As of March 31, 2021 and December 31, 2020, we had $1.9 million and $1.7 million, respectively, of restricted cash that serves to collateralize outstanding letters of credit. This restricted cash is included in cash and cash equivalents in our Condensed Consolidated Balance Sheets (“Balance Sheets” or “Balance Sheet”). For the cash and cash equivalents denominated in foreign currencies and/or located outside the U.S., we do not anticipate any material amounts being unavailable for use in running our business, but may face limitations on moving cash out of certain foreign jurisdictions due to currency controls and potential negative economic consequences. Short-term Investments and Other Financial Instruments . Our financial instruments as of March 31, 2021 and December 31, 2020 include cash and cash equivalents, short-term investments, accounts receivable, accounts payable, and debt. Due to their short maturities, the carrying amounts of cash equivalents, accounts receivable, and accounts payable approximate their fair value. Our short-term investments and certain of our cash equivalents are considered “available-for-sale” and are reported at fair value in our Balance Sheets, with unrealized gains and losses, net of the related income tax effect, excluded from earnings and reported in a separate component of stockholders’ equity. Realized and unrealized gains and losses were not material in any period presented. Primarily all short-term investments held by us as of March 31, 2021 and December 31, 2020 have contractual maturities of less than two years from the time of acquisition. Our short-term investments as of March 31, 2021 and December 31, 2020 consisted almost entirely of fixed income securities. Proceeds from the sale/maturity of short-term investments for the first quarters of March 31, 2021 and 2020 were $29.3 million and $18.7 million, respectively. Our short-term investments as of March 31, 2021 and December 31, 2020 were $54.5 million and $51.6 million, respectively. The following table represents the fair value hierarchy based upon three levels of inputs, of which Levels 1 and 2 are considered observable and Level 3 is unobservable, for our financial assets measured at fair value (in thousands): March 31, 2021 December 31, 2020 Level 1 Level 2 Total Level 1 Level 2 Total Cash equivalents: Money market funds $ 33,546 $ — $ 33,546 $ 33,535 $ — $ 33,535 Commercial paper — 9,224 9,224 — 15,746 15,746 Corporate debt securities — — — — 1,351 1,351 Short-term investments: Corporate debt securities — 42,544 42,544 — 38,672 38,672 U.S. government agency bonds — 4,628 4,628 — 4,642 4,642 Asset-backed securities — 7,367 7,367 — 8,284 8,284 Total $ 33,546 $ 63,763 $ 97,309 $ 33,535 $ 68,695 $ 102,230 Valuation inputs used to measure the fair values of our money market funds were derived from quoted market prices. The fair values of all other financial instruments are based upon pricing provided by third-party pricing services. These prices were derived from observable market inputs. We have chosen not to record our debt at fair value, with changes recognized in earnings each reporting period. The following table indicates the carrying value (par value for convertible debt) and estimated fair value of our debt as of the indicated periods (in thousands): March 31, 2021 December 31, 2020 Carrying Fair Carrying Fair Value Value Value Value 2018 Credit Agreement (carrying value including current maturities) $ 123,750 $ 123,750 $ 126,563 $ 126,563 2016 Convertible debt (par value) 230,000 243,513 230,000 244,663 The fair value for our credit agreement was estimated using a discounted cash flow methodology, while the fair value for our convertible debt was estimated based upon quoted market prices or recent sales activity, both of which are considered Level 2 inputs. Equity Method Investment . We held a 15% noncontrolling interest in a payment technology and services company with a carrying value of approximately $8 million as of March 31, 2021 and December 31, 2020, included in other non-current assets in our Balance Sheets. Accounting Pronouncement Issued But Not Yet Effective. In August 2020, the FASB issued ASU No. 2020-06, Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity (“ASU 2020-06”), which simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts in an entity’s own equity. ASU 2020-06 also amends the related Earnings Per Share guidance. ASU 2020-06 is effective for fiscal years beginning after December 15, 2021, and can be adopted on either a fully retrospective or modified retrospective basis. We are currently evaluating the timing, method of adoption, and overall impact of this standard on our Financial Statements.

Long-Lived Assets

Long-Lived Assets	3 Months Ended
	Mar. 31, 2021
Goodwill And Intangible Assets Disclosure [Abstract]
Long-Lived Assets	3. LONG-LIVED ASSETS Goodwill. The changes in the carrying amount of goodwill for the first quarter of 2021 were as follows (in thousands): January 1, 2021 balance $ 272,322 Goodwill acquired during period 168 Adjustments related to prior acquisitions (15 ) Effects of changes in foreign currency exchange rates 790 March 31, 2021 balance $ 273,265 Other Intangible Assets. Our other intangible assets subject to ongoing amortization consist primarily of acquired customer contracts and software. As of March 31, 2021 and December 31, 2020, the carrying values of these assets were as follows (in thousands): March 31, 2021 December 31, 2020 Gross Gross Carrying Accumulated Net Carrying Accumulated Net Amount Amortization Amount Amount Amortization Amount Acquired customer contracts $ 154,119 $ (107,846 ) $ 46,273 $ 153,790 $ (105,778 ) $ 48,012 Software 169,247 (143,662 ) 25,585 166,289 (139,836 ) 26,453 Total intangible assets $ 323,366 $ (251,508 ) $ 71,858 $ 320,079 $ (245,614 ) $ 74,465 The total amortization expense related to other intangible assets for the first quarters of 2021 and 2020 were $5.6 million and $6.3 million, respectively. Based on the March 31, 2021 net carrying value of our other intangible assets, the estimated total amortization expense for each of the five succeeding fiscal years ending December 31 are: 2021 – $20.5 million; 2022 – $14.7 million; 2023 – $10.8 million; 2024 – $7.4 million; and 2025 – $6.5 million. Customer Contract Costs . As of March 31, 2021 and December 31, 2020, the carrying values of our customer contract cost assets, related to those contracts with a contractual term greater than one year, were as follows (in thousands): March 31, 2021 December 31, 2020 Gross Gross Carrying Accumulated Net Carrying Accumulated Net Amount Amortization Amount Amount Amortization Amount Customer contract costs $ 90,136 $ (42,802 ) $ 47,334 $ 87,131 $ (39,893 ) $ 47,238 The total amortization expense related to customer contract costs for the first quarters of 2021 and 2020 were $4.7 million and $4.0 million, respectively.

Debt

Debt	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Debt	4. DEBT Our long-term debt, as of March 31, 2021 and December 31, 2020, was as follows (in thousands): March 31, December 31, 2021 2020 2018 Credit Agreement: Term loan, due March 2023 $ 123,750 $ 126,563 Less – deferred financing costs (1,017 ) (1,155 ) 2018 Term Loan, net of unamortized discounts 122,733 125,408 $200 million revolving loan facility, due March 2023 — — 2016 Convertible Notes: Convertible Notes – Senior convertible notes; due March 15, 2036; cash interest at 4.25% 230,000 230,000 Less – unamortized original issue discount (2,249 ) (3,021 ) Less – deferred financing costs (870 ) (1,170 ) 2016 Convertible Notes, net of unamortized discounts 226,881 225,809 Total debt, net of unamortized discounts 349,614 351,217 Current portion of long-term debt, net of unamortized discounts (241,881 ) (14,063 ) Long-term debt, net of unamortized discounts $ 107,733 $ 337,154 2018 Credit Agreement . During the quarter ended March 31, 2021, we made $2.8 million of principal repayments on our $150 million aggregate principal five-year five-year The interest rates under the 2018 Credit Agreement are based upon our choice of an adjusted LIBOR rate plus an applicable margin of 1.50% – 2.50%, or an alternate base rate plus an applicable margin of 0.50% – 1.50%, with the applicable margin, depending on our then-net secured total leverage ratio. We will pay a commitment fee of 0.200% – 0.375% of the average daily unused amount of the 2018 Revolver, with the commitment fee rate also dependent upon our then-net secured total leverage ratio. If the LIBOR rate is no longer available, then our interest rate under the Credit Agreement will be determined by the alternate base rate plus an applicable margin as discussed above. 2016 Convertible Notes. We will settle conversions of the 2016 Convertible Notes by paying or delivering, as the case may be, cash, shares of our common stock, or a combination thereof, at our election. It is our current intent and policy to settle our conversion obligations as follows: (i) pay cash for 100% of the par value of the 2016 Convertible Notes that are converted; and (ii) to the extent the value of our conversion obligation exceeds the par value, we can satisfy the remaining conversion obligation in our common stock, cash, or a combination thereof. The 2016 Convertible Notes will be convertible at the option of the note holders upon the satisfaction of specified conditions and during certain periods. During the period from, and including, December 15, 2021 to the close of business on the business day immediately preceding March 15, 2022 and on or after December 15, 2035, holders may convert all or any portion of their 2016 Convertible Notes at the conversion rate then in effect at any time regardless of these conditions. For the 2016 Convertible Notes presented during this time frame, the settlement amount will be equal to the sum of the daily settlement amounts for each of the following 40 consecutive trading days during the related observation period. As the 2016 Convertible Notes can be converted at the holder's option beginning December 15, 2021 and ending March 15, 2022, subject to an observation holding period of 40 days, the net carrying value of the 2016 Convertible Notes of $226.9 million has been classified as a current liability in our Balance Sheet as of March 31, 2021. As a result of our quarterly dividend in March 2021 (see Note 7), the previous conversion rate for the 2016 Convertible Notes of 17.6656 shares of our common stock per $1,000 principal amount of the 2016 Convertible Notes, which is equivalent to an initial conversion price of $56.61 per share of our common stock, has been adjusted to 17.6898 shares of our common stock per $1,000 principal amount of the 2016 Convertible Notes, which is equivalent to an initial conversion price of $56.53 per share of our common stock. Holders may require us to repurchase the 2016 Convertible Notes for cash on each of March 15, 2022, March 15, 2026, and March 15, 2031, or upon the occurrence of a fundamental change (as defined in the 2016 Convertible Notes Indenture) in each case at a purchase price equal to the principal amount thereof plus accrued and unpaid interest. We may redeem for cash all or part of the 2016 Convertible Notes if the last reported sale price of our common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending on, and including, the trading day immediately preceding the date on which we provide notice of redemption. On or after March 15, 2022, we may redeem for cash all or part of the 2016 Convertible Notes regardless of the sales price condition described in the preceding sentence. In each case, the redemption price will equal the principal amount of the 2016 Convertible Notes to be redeemed, plus accrued and unpaid interest. As of March 31, 2021, none of the conversion features have been achieved, and thus, the 2016 Convertible Notes are not convertible by the holders.

Commitments, Guarantees and Con

Commitments, Guarantees and Contingencies	3 Months Ended
	Mar. 31, 2021
Commitments And Contingencies Disclosure [Abstract]
Commitments, Guarantees and Contingencies	5. COMMITMENTS, GUARANTEES AND CONTINGENCIES Guarantees . In the ordinary course of business, we may provide guarantees in the form of bid bonds, performance bonds, or standby letters of credit. At March 31, 2021 , we had $2.9 million of restricted assets used to collateralize these guarantees, with $1.9 million included in cash and cash equivalents and $1.0 million included in other non-current assets. We have bid bonds and performance guarantees in form of surety bonds issued through a third-party of $4.4 million that were not required to be recorded on our Balance Sheet. We are ultimately liable for claims that may occur against these guarantees. We have no history of material claims or are aware of circumstances that would require us to pay under any of these arrangements. We also believe that the resolution of any claim that may arise in the future, either individually or in the aggregate, would not be material to our Financial Statements. Additionally, we have money transmitter bonds issued through a third-party for the benefit of various states to comply with the states’ financial requirements and industry regulations for money transmitter licenses. At March 31, 2021 Warranties. We generally warrant that our solutions and related offerings will conform to published specifications, or to specifications provided in an individual customer arrangement, as applicable. The typical warranty period is 90 days from the date of acceptance of the solution or offering. For certain service offerings we provide a warranty for the duration of the services provided. We generally warrant that services will be performed in a professional and workmanlike manner. The typical remedy for breach of warranty is to correct or replace any defective deliverable, and if not possible or practical, we will accept the return of the defective deliverable and refund the amount paid under the customer arrangement that is allocable to the defective deliverable. Our contracts also generally contain limitation of damages provisions in an effort to reduce our exposure to monetary damages arising from breach of warranty claims. Historically, we have incurred minimal warranty costs, and as a result, do not maintain a warranty reserve. Solution and Services Indemnifications. Our arrangements with our customers generally include an indemnification provision that will indemnify and defend a customer in actions brought against the customer that claim our products and/or services infringe upon a copyright, trade secret, or valid patent. Historically, we have not incurred any significant costs related to such indemnification claims, and as a result, do not maintain a reserve for such exposure. Claims for Company Non-performance. Our arrangements with our customers typically limit our liability for breach to a specified amount of the direct damages incurred by the customer resulting from the breach. From time-to-time, these arrangements may also include provisions for possible liquidated damages or other financial remedies for our non-performance, or in the case of certain of our outsourced customer care and billing solutions, provisions for damages related to service level performance requirements. The service level performance requirements typically relate to system availability and timeliness of service delivery. As of March 31, 2021, we believe we have adequate reserves, based on our historical experience, to cover any reasonably anticipated exposure as a result of our nonperformance for any past or current arrangements with our customers. Indemnifications Related to Officers and the Board of Directors. We have agreed to indemnify members of our Board of Directors (the “Board”) and certain of our officers if they are named or threatened to be named as a party to any proceeding by reason of the fact that they acted in such capacity. We maintain directors’ and officers’ (D&O) insurance coverage to protect against such losses. We have not historically incurred any losses related to these types of indemnifications, and are not aware of any pending or threatened actions or claims against any officer or member of our Board. As a result, we have not recorded any liabilities related to such indemnifications as of March 31, 2021. In addition, as a result of the insurance policy coverage, we believe these indemnification agreements are not significant to our results of operations. Legal Proceedings. From time-to-time, we are involved in litigation relating to claims arising out of our operations in the normal course of business.

Earnings Per Common Share

Earnings Per Common Share	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Earnings Per Common Share	6. EARNINGS PER COMMON SHARE Basic and diluted earnings per common share (“EPS”) amounts are presented on the face of the accompanying Income Statements. No reconciliation of the basic and diluted EPS numerators is necessary as net income is used as the numerators for all periods presented. The reconciliation of the basic and diluted EPS denominators related to the common shares is included in the following table (in thousands): Quarter Ended March 31, 2021 2020 Basic weighted-average common shares 31,844 31,994 Dilutive effect of restricted common stock 302 364 Diluted weighted-average common shares 32,146 32,358 The Convertible Notes have a dilutive effect only in those quarterly periods in which our average stock price exceeds the current effective conversion price (see Note 4). The stock warrants have a dilutive effect only in those quarterly periods in which our average stock price exceeds the exercise price of $26.68 per warrant (under the treasury stock method), and are not subject to performance vesting conditions (see Note 7). Potentially dilutive common shares related to non-participating unvested restricted stock excluded from the computation of diluted EPS, as the effect was antidilutive, were not material in any period presented.

Stockholders' Equity and Equity

Stockholders' Equity and Equity Compensation Plans	3 Months Ended
	Mar. 31, 2021
Stockholders Equity Note [Abstract]
Stockholders' Equity and Equity Compensation Plans	7. STOCKHOLDERS’ EQUITY AND EQUITY COMPENSATION PLANS Stock Repurchase Program. We currently have a stock repurchase program, approved by our Board, authorizing us to repurchase our common stock from time-to-time as market and business conditions warrant (the “Stock Repurchase Program”). During the first quarters of 2021 and 2020 we repurchased approximately 142,000 shares of our common stock for $6.5 million (weighted-average price of $45.94 per share) and approximately 142,000 shares of our common stock for $6.4 million (weighted-average price of $45.26 per share), respectively, under a SEC Rule 10b5-1 Plan. As of March 31, 2021, the total remaining number of shares available for repurchase under the Stock Repurchase Program totaled 4.2 million shares. Stock Repurchases for Tax Withholdings. In addition to the above-mentioned stock repurchases, during the first quarters of 2021 and 2020 we repurchased and then cancelled approximately 110,000 shares of common stock for $5.2 million and approximately 157,000 shares of common stock for $7.6 million, respectively, in connection with minimum tax withholding requirements resulting from the vesting of restricted common stock under our stock incentive plans. Cash During the first quarter of 2021, the Board approved a quarterly cash dividend of $0.25 per share of common stock, totaling $8.2 million. During the first quarter of 2020, the Board approved a quarterly cash dividend of $0.235 per share of common stock, totaling $7.7 million. Warrants . In 2014, in conjunction with the execution of an amendment to our current agreement with Comcast Corporation (“Comcast”), we issued stock warrants (the “Warrant Agreement”) for the right to purchase up to 2.9 million shares of our common stock (the “Stock Warrants”) as an additional incentive for Comcast to convert customer accounts onto our Advanced Convergent Platform (“ACP”) based on various milestones. The Stock Warrants have a ten-year As of March 31, 2021, 1.0 million Stock Warrants remain issued, none of which were vested. The remaining unvested Stock Warrants will be accounted for as a customer contract cost asset once the performance conditions necessary for vesting are considered probable. Stock-Based Awards. A summary of our unvested restricted common stock activity during the first quarter of 2021 is as follows (shares in thousands): Quarter Ended March 31, 2021 Shares Weighted- Average Grant Date Fair Value Unvested awards, beginning 1,041 $ 41.31 Awards granted 513 47.88 Awards forfeited/cancelled (2 ) 40.81 Awards vested (340 ) 41.65 Unvested awards, ending 1,212 $ 43.87 Included in the awards granted during the first quarter of 2021 two-year The other restricted common stock shares granted during the first quarter of 2021 We recorded stock-based compensation expense for the first quarters of 2021 and 2020 of $5.4 million and $4.9 million, respectively .

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Use of Estimates in Preparation of Financial Statements	Use of Estimates in Preparation of Financial Statements. The preparation of the accompanying Financial Statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of our Financial Statements, and the reported amounts of revenue and expenses during the reporting periods. Actual results could differ from those estimates.
Revenue	Revenue. The majority of our future revenue is related to our revenue management solution customer contracts that include variable consideration dependent upon a series of monthly volumes and/or daily usage of services and have contractual terms ending from 2021 through 2028. Our customer contracts may include guaranteed minimums and fixed monthly or annual fees. As of March 31, 2021, our aggregate amount of the transaction price allocated to the remaining performance obligations is approximately $900 million, which is made up of fixed fee consideration and guaranteed minimums expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied). We expect to recognize approximately 80% of this amount by the end of 2023, with the remaining amount recognized by the end of 2028. We have excluded from this amount variable consideration expected to be recognized in the future related to performance obligations that are unsatisfied. The nature, amount, timing, and uncertainty of our revenue and how revenue and cash flows are affected by economic factors is most appropriately depicted by revenue type, geographic region, and customer vertical. Revenue by type for the first quarters of 2021 and 2020 was as follows (in thousands): Quarter Ended March 31, 2021 2020 Cloud and related solutions $ 227,019 $ 222,220 Software and services 14,779 13,206 Maintenance 11,321 10,191 Total revenue $ 253,119 $ 245,617 We use the location of the customer as the basis of attributing revenue to geographic regions. Revenue by geographic region for the first quarters of 2021 and 2020 , as a percentage of our total revenue, was as follows: Quarter Ended March 31, 2021 2020 Americas (principally the U.S.) 86 % 88 % Europe, Middle East, and Africa 10 % 9 % Asia Pacific 4 % 3 % Total revenue 100 % 100 % We generate our revenue primarily from the global communications markets; however, we serve an expanding group of customers in markets including financial services, healthcare, media and entertainment companies, and government entities. Revenue by customer vertical for the first quarters of 2021 and 2020 , as a percentage of our total revenue, was as follows: Quarter Ended March 31, 2021 2020 Broadband/Cable/Satellite 57 % 58 % Telecommunications 18 % 17 % Other 25 % 25 % Total revenue 100 % 100 % Deferred revenue recognized for the first quarters of 2021and 2020 was $20.1 million and $17.7 million, respectively.
Cash and Cash Equivalents	Cash and Cash Equivalents. We consider all highly liquid investments with original maturities of three months or less at the date of the purchase to be cash equivalents. As of March 31, 2021 and December 31, 2020, our cash equivalents consist primarily of institutional money market funds, commercial paper, and time deposits held at major banks. As of March 31, 2021 and December 31, 2020, we had $1.9 million and $1.7 million, respectively, of restricted cash that serves to collateralize outstanding letters of credit. This restricted cash is included in cash and cash equivalents in our Condensed Consolidated Balance Sheets (“Balance Sheets” or “Balance Sheet”). For the cash and cash equivalents denominated in foreign currencies and/or located outside the U.S., we do not anticipate any material amounts being unavailable for use in running our business, but may face limitations on moving cash out of certain foreign jurisdictions due to currency controls and potential negative economic consequences.
Short-term Investments and Other Financial Instruments	Short-term Investments and Other Financial Instruments . Our financial instruments as of March 31, 2021 and December 31, 2020 include cash and cash equivalents, short-term investments, accounts receivable, accounts payable, and debt. Due to their short maturities, the carrying amounts of cash equivalents, accounts receivable, and accounts payable approximate their fair value. Our short-term investments and certain of our cash equivalents are considered “available-for-sale” and are reported at fair value in our Balance Sheets, with unrealized gains and losses, net of the related income tax effect, excluded from earnings and reported in a separate component of stockholders’ equity. Realized and unrealized gains and losses were not material in any period presented. Primarily all short-term investments held by us as of March 31, 2021 and December 31, 2020 have contractual maturities of less than two years from the time of acquisition. Our short-term investments as of March 31, 2021 and December 31, 2020 consisted almost entirely of fixed income securities. Proceeds from the sale/maturity of short-term investments for the first quarters of March 31, 2021 and 2020 were $29.3 million and $18.7 million, respectively. Our short-term investments as of March 31, 2021 and December 31, 2020 were $54.5 million and $51.6 million, respectively. The following table represents the fair value hierarchy based upon three levels of inputs, of which Levels 1 and 2 are considered observable and Level 3 is unobservable, for our financial assets measured at fair value (in thousands): March 31, 2021 December 31, 2020 Level 1 Level 2 Total Level 1 Level 2 Total Cash equivalents: Money market funds $ 33,546 $ — $ 33,546 $ 33,535 $ — $ 33,535 Commercial paper — 9,224 9,224 — 15,746 15,746 Corporate debt securities — — — — 1,351 1,351 Short-term investments: Corporate debt securities — 42,544 42,544 — 38,672 38,672 U.S. government agency bonds — 4,628 4,628 — 4,642 4,642 Asset-backed securities — 7,367 7,367 — 8,284 8,284 Total $ 33,546 $ 63,763 $ 97,309 $ 33,535 $ 68,695 $ 102,230 Valuation inputs used to measure the fair values of our money market funds were derived from quoted market prices. The fair values of all other financial instruments are based upon pricing provided by third-party pricing services. These prices were derived from observable market inputs. We have chosen not to record our debt at fair value, with changes recognized in earnings each reporting period. The following table indicates the carrying value (par value for convertible debt) and estimated fair value of our debt as of the indicated periods (in thousands): March 31, 2021 December 31, 2020 Carrying Fair Carrying Fair Value Value Value Value 2018 Credit Agreement (carrying value including current maturities) $ 123,750 $ 123,750 $ 126,563 $ 126,563 2016 Convertible debt (par value) 230,000 243,513 230,000 244,663 The fair value for our credit agreement was estimated using a discounted cash flow methodology, while the fair value for our convertible debt was estimated based upon quoted market prices or recent sales activity, both of which are considered Level 2 inputs.
Equity Method Investment	Equity Method Investment . We held a 15% noncontrolling interest in a payment technology and services company with a carrying value of approximately $8 million as of March 31, 2021 and December 31, 2020, included in other non-current assets in our Balance Sheets.
Accounting Pronouncement Issued But Not Yet Effective	Accounting Pronouncement Issued But Not Yet Effective. In August 2020, the FASB issued ASU No. 2020-06, Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity (“ASU 2020-06”), which simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts in an entity’s own equity. ASU 2020-06 also amends the related Earnings Per Share guidance. ASU 2020-06 is effective for fiscal years beginning after December 15, 2021, and can be adopted on either a fully retrospective or modified retrospective basis. We are currently evaluating the timing, method of adoption, and overall impact of this standard on our Financial Statements.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Schedule of Revenue Disaggregated by Revenue Type, Geographic Region and Customer	The nature, amount, timing, and uncertainty of our revenue and how revenue and cash flows are affected by economic factors is most appropriately depicted by revenue type, geographic region, and customer vertical. Revenue by type for the first quarters of 2021 and 2020 was as follows (in thousands): Quarter Ended March 31, 2021 2020 Cloud and related solutions $ 227,019 $ 222,220 Software and services 14,779 13,206 Maintenance 11,321 10,191 Total revenue $ 253,119 $ 245,617 We use the location of the customer as the basis of attributing revenue to geographic regions. Revenue by geographic region for the first quarters of 2021 and 2020 , as a percentage of our total revenue, was as follows: Quarter Ended March 31, 2021 2020 Americas (principally the U.S.) 86 % 88 % Europe, Middle East, and Africa 10 % 9 % Asia Pacific 4 % 3 % Total revenue 100 % 100 % We generate our revenue primarily from the global communications markets; however, we serve an expanding group of customers in markets including financial services, healthcare, media and entertainment companies, and government entities. Revenue by customer vertical for the first quarters of 2021 and 2020 , as a percentage of our total revenue, was as follows: Quarter Ended March 31, 2021 2020 Broadband/Cable/Satellite 57 % 58 % Telecommunications 18 % 17 % Other 25 % 25 % Total revenue 100 % 100 %
Fair Value Measurements	The following table represents the fair value hierarchy based upon three levels of inputs, of which Levels 1 and 2 are considered observable and Level 3 is unobservable, for our financial assets measured at fair value (in thousands): March 31, 2021 December 31, 2020 Level 1 Level 2 Total Level 1 Level 2 Total Cash equivalents: Money market funds $ 33,546 $ — $ 33,546 $ 33,535 $ — $ 33,535 Commercial paper — 9,224 9,224 — 15,746 15,746 Corporate debt securities — — — — 1,351 1,351 Short-term investments: Corporate debt securities — 42,544 42,544 — 38,672 38,672 U.S. government agency bonds — 4,628 4,628 — 4,642 4,642 Asset-backed securities — 7,367 7,367 — 8,284 8,284 Total $ 33,546 $ 63,763 $ 97,309 $ 33,535 $ 68,695 $ 102,230
Carrying Value (Par Value for Convertible Debt) and Estimated Fair Value of Debt	We have chosen not to record our debt at fair value, with changes recognized in earnings each reporting period. The following table indicates the carrying value (par value for convertible debt) and estimated fair value of our debt as of the indicated periods (in thousands): March 31, 2021 December 31, 2020 Carrying Fair Carrying Fair Value Value Value Value 2018 Credit Agreement (carrying value including current maturities) $ 123,750 $ 123,750 $ 126,563 $ 126,563 2016 Convertible debt (par value) 230,000 243,513 230,000 244,663

Long-Lived Assets (Tables)

Long-Lived Assets (Tables)	3 Months Ended
	Mar. 31, 2021
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Changes in Carrying Amount of Goodwill	Goodwill. The changes in the carrying amount of goodwill for the first quarter of 2021 were as follows (in thousands): January 1, 2021 balance $ 272,322 Goodwill acquired during period 168 Adjustments related to prior acquisitions (15 ) Effects of changes in foreign currency exchange rates 790 March 31, 2021 balance $ 273,265
Summary of Carrying Value of Assets	As of March 31, 2021 and December 31, 2020, the carrying values of these assets were as follows (in thousands): March 31, 2021 December 31, 2020 Gross Gross Carrying Accumulated Net Carrying Accumulated Net Amount Amortization Amount Amount Amortization Amount Acquired customer contracts $ 154,119 $ (107,846 ) $ 46,273 $ 153,790 $ (105,778 ) $ 48,012 Software 169,247 (143,662 ) 25,585 166,289 (139,836 ) 26,453 Total intangible assets $ 323,366 $ (251,508 ) $ 71,858 $ 320,079 $ (245,614 ) $ 74,465
Summary of Carrying Values of Customer Contract Cost Assets	Customer Contract Costs . As of March 31, 2021 and December 31, 2020, the carrying values of our customer contract cost assets, related to those contracts with a contractual term greater than one year, were as follows (in thousands): March 31, 2021 December 31, 2020 Gross Gross Carrying Accumulated Net Carrying Accumulated Net Amount Amortization Amount Amount Amortization Amount Customer contract costs $ 90,136 $ (42,802 ) $ 47,334 $ 87,131 $ (39,893 ) $ 47,238

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Long-Term Debt	Our long-term debt, as of March 31, 2021 and December 31, 2020, was as follows (in thousands): March 31, December 31, 2021 2020 2018 Credit Agreement: Term loan, due March 2023 $ 123,750 $ 126,563 Less – deferred financing costs (1,017 ) (1,155 ) 2018 Term Loan, net of unamortized discounts 122,733 125,408 $200 million revolving loan facility, due March 2023 — — 2016 Convertible Notes: Convertible Notes – Senior convertible notes; due March 15, 2036; cash interest at 4.25% 230,000 230,000 Less – unamortized original issue discount (2,249 ) (3,021 ) Less – deferred financing costs (870 ) (1,170 ) 2016 Convertible Notes, net of unamortized discounts 226,881 225,809 Total debt, net of unamortized discounts 349,614 351,217 Current portion of long-term debt, net of unamortized discounts (241,881 ) (14,063 ) Long-term debt, net of unamortized discounts $ 107,733 $ 337,154

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Reconciliation of the Basic and Diluted EPS Denominators	The reconciliation of the basic and diluted EPS denominators related to the common shares is included in the following table (in thousands): Quarter Ended March 31, 2021 2020 Basic weighted-average common shares 31,844 31,994 Dilutive effect of restricted common stock 302 364 Diluted weighted-average common shares 32,146 32,358

Stockholders' Equity and Equi_2

Stockholders' Equity and Equity Compensation Plans (Tables)	3 Months Ended
	Mar. 31, 2021
Stockholders Equity Note [Abstract]
Summary of Unvested Restricted Common Stock Activity	A summary of our unvested restricted common stock activity during the first quarter of 2021 is as follows (shares in thousands): Quarter Ended March 31, 2021 Shares Weighted- Average Grant Date Fair Value Unvested awards, beginning 1,041 $ 41.31 Awards granted 513 47.88 Awards forfeited/cancelled (2 ) 40.81 Awards vested (340 ) 41.65 Unvested awards, ending 1,212 $ 43.87

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items]
Aggregate amount of transaction price allocated to remaining performance obligations	$ 900,000
Remaining performance obligations expected to be recognized, year	2028
Deferred revenue recognized	$ 20,100	$ 17,700
Restricted cash	1,900		$ 1,700
Proceeds from sale/maturity of short-term investments	29,340	$ 18,670
Short-term investments	54,539		51,598
Other Non-current Assets
Summary Of Significant Accounting Policies [Line Items]
Equity method investment, carrying value	$ 8,000		$ 8,000
Payment Technology and Services Company
Summary Of Significant Accounting Policies [Line Items]
Equity method investment, noncontrolling interest	15.00%
Minimum
Summary Of Significant Accounting Policies [Line Items]
Future revenue including variable consideration, contractual terms ending, year	2021
Maximum
Summary Of Significant Accounting Policies [Line Items]
Future revenue including variable consideration, contractual terms ending, year	2028
Short-term investment contractual maturities	2 years		2 years

Summary of Significant Accoun_5

Summary of Significant Accounting Policies (Details Textual 1) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-04-01	Mar. 31, 2021
Summary Of Significant Accounting Policies [Line Items]
Remaining performance obligations expected to be recognized, percentage	80.00%
Remaining performance obligations expected to be recognized, period	2 years 9 months

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Schedule of Revenue Disaggregated by Revenue Type, Geographic Region and Customer (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation Of Revenue [Line Items]
Total revenue	$ 253,119	$ 245,617
Percentage of total revenue	100.00%	100.00%
Broadband/Cable/Satellite
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	57.00%	58.00%
Telecommunications
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	18.00%	17.00%
Other
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	25.00%	25.00%
Americas (principally the U.S.)
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	86.00%	88.00%
Europe, Middle East and Africa
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	10.00%	9.00%
Asia Pacific
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	4.00%	3.00%
Cloud and Related Solutions
Disaggregation Of Revenue [Line Items]
Total revenue	$ 227,019	$ 222,220
Software and Services
Disaggregation Of Revenue [Line Items]
Total revenue	14,779	13,206
Maintenance
Disaggregation Of Revenue [Line Items]
Total revenue	$ 11,321	$ 10,191

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets:
Assets fair value	$ 97,309	$ 102,230
Cash equivalents | Money Market Funds
Assets:
Assets fair value	33,546	33,535
Cash equivalents | Commercial Paper
Assets:
Assets fair value	9,224	15,746
Cash equivalents | Corporate Debt Securities
Assets:
Assets fair value		1,351
Short-term Investments | Corporate Debt Securities
Assets:
Assets fair value	42,544	38,672
Short-term Investments | U.S. Government Agency Bonds
Assets:
Assets fair value	4,628	4,642
Short-term Investments | Asset-backed securities
Assets:
Assets fair value	7,367	8,284
Level 1
Assets:
Assets fair value	33,546	33,535
Level 1 | Cash equivalents | Money Market Funds
Assets:
Assets fair value	33,546	33,535
Level 2
Assets:
Assets fair value	63,763	68,695
Level 2 | Cash equivalents | Commercial Paper
Assets:
Assets fair value	9,224	15,746
Level 2 | Cash equivalents | Corporate Debt Securities
Assets:
Assets fair value		1,351
Level 2 | Short-term Investments | Corporate Debt Securities
Assets:
Assets fair value	42,544	38,672
Level 2 | Short-term Investments | U.S. Government Agency Bonds
Assets:
Assets fair value	4,628	4,642
Level 2 | Short-term Investments | Asset-backed securities
Assets:
Assets fair value	$ 7,367	$ 8,284

Summary of Significant Accoun_8

Summary of Significant Accounting Policies - Carrying Value (Par Value for Convertible Debt) and Estimated Fair Value of Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
2018 Credit Agreement | 2018 Term Loan
Carrying value and estimated fair value of debt
Fair Value	$ 123,750	$ 126,563
Carrying Value	123,750	126,563
Senior Convertible Notes 2016
Carrying value and estimated fair value of debt
Fair Value	243,513	244,663
Carrying Value	$ 230,000	$ 230,000

Long-Lived Assets - Summary of

Long-Lived Assets - Summary of Changes in Carrying Amount of Goodwill (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)
Goodwill RollForward
Beginning balance	$ 272,322
Goodwill acquired during period	168
Adjustments related to prior acquisitions	(15)
Effects of changes in foreign currency exchange rates	790
Ending balance	$ 273,265

Long-Lived Assets - Summary o_2

Long-Lived Assets - Summary of Carrying Value of Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 323,366	$ 320,079
Accumulated Amortization	(251,508)	(245,614)
Net Amount	71,858	74,465
Acquired customer contracts
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	154,119	153,790
Accumulated Amortization	(107,846)	(105,778)
Net Amount	46,273	48,012
Software
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	169,247	166,289
Accumulated Amortization	(143,662)	(139,836)
Net Amount	$ 25,585	$ 26,453

Long-Lived Assets (Details Text

Long-Lived Assets (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Finite Lived Intangible Assets [Line Items]
Total amortization expense	$ 5.6	$ 6.3
Estimated total amortization expense 2021	20.5
Estimated total amortization expense 2022	14.7
Estimated total amortization expense 2023	10.8
Estimated total amortization expense 2024	7.4
Estimated total amortization expense 2025	6.5
Customer contract costs
Finite Lived Intangible Assets [Line Items]
Total amortization expense	$ 4.7	$ 4

Long-Lived Assets - Summary o_3

Long-Lived Assets - Summary of Carrying Values of Customer Contract Cost Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Capitalized Contract Cost [Abstract]
Customer contract costs, Gross Carrying Amount	$ 90,136	$ 87,131
Customer contract costs, Accumulated Amortization	(42,802)	(39,893)
Customer contract costs, Net Amount	$ 47,334	$ 47,238

Debt - Long-Term Debt (Details)

Debt - Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Less - unamortized original issue discount	$ (1,017)	$ (5,346)
Total debt, net of unamortized discounts	349,614	351,217
Current portion of long-term debt, net of unamortized discounts	(241,881)	(14,063)
Long-term debt, net of unamortized discounts	107,733	337,154
2018 Credit Agreement | 2018 Term Loan
Debt Instrument [Line Items]
Total long-term debt, gross	123,750	126,563
Less – deferred financing costs	(1,017)	(1,155)
Total debt, net of unamortized discounts	122,733	125,408
Senior Convertible Notes 2016
Debt Instrument [Line Items]
Total long-term debt, gross	230,000	230,000
Less - unamortized original issue discount	(2,249)	(3,021)
Less – deferred financing costs	(870)	(1,170)
Total debt, net of unamortized discounts	226,881	$ 225,809
Current portion of long-term debt, net of unamortized discounts	$ (226,900)

Debt - Long-Term Debt (Parenthe

Debt - Long-Term Debt (Parenthetical) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
2018 Credit Agreement | 2018 Term Loan
Debt Instrument [Line Items]
Basis spread on term loan	1.50%
Term loan combined interest rate	1.70%	1.75%
Maturity period	Mar. 31, 2023
2018 Credit Agreement | Revolving Loan
Debt Instrument [Line Items]
Amount available under credit facility	$ 200,000,000
Maturity period	Mar. 31, 2023
Senior Convertible Notes 2016
Debt Instrument [Line Items]
Maturity period	Mar. 15, 2036
Interest rate on senior subordinated convertible notes	4.25%

Debt - Credit Agreement (Detail

Debt - Credit Agreement (Details Textual) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Principal repayments	$ 2,813,000	$ 1,875,000
2018 Credit Agreement | Minimum
Debt Instrument [Line Items]
Line of credit facility, unused capacity, commitment fee percentage	0.20%
2018 Credit Agreement | Maximum
Debt Instrument [Line Items]
Line of credit facility, unused capacity, commitment fee percentage	0.375%
2018 Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum
Debt Instrument [Line Items]
Basis spread on term loan	1.50%
2018 Credit Agreement | London Interbank Offered Rate (LIBOR) | Maximum
Debt Instrument [Line Items]
Basis spread on term loan	2.50%
2018 Credit Agreement | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on term loan	0.50%
2018 Credit Agreement | Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on term loan	1.50%
2018 Credit Agreement | Revolving Loan
Debt Instrument [Line Items]
Amount available under credit facility	$ 200,000,000
Credit facility term	5 years
Line of credit facility, unused capacity, commitment fee percentage	0.20%
Credit facility, outstanding borrowings	$ 0
Credit facility, current borrowing capacity	200,000,000
2018 Credit Agreement | 2018 Term Loan
Debt Instrument [Line Items]
Principal repayments	2,800,000
Term loan aggregate principal amount	$ 150,000,000
Term loan period	5 years
Term loan combined interest rate	1.70%		1.75%
Basis spread on term loan	1.50%

Debt - 2016 Convertible Notes (

Debt - 2016 Convertible Notes (Details Textual) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021USD ($)Tradingday$ / shares	Dec. 31, 2020USD ($)$ / shares
Debt Instrument [Line Items]
Net carrying value	$ 241,881	$ 14,063
Senior Convertible Notes 2016
Debt Instrument [Line Items]
Percentage of par value of convertible notes to be settled in cash	100.00%
Observation holding period	40 days
Net carrying value	$ 226,900
Initial conversion rate of common stock	17.6898	17.6656
Convertible Notes, initial conversion of Par Value Convertible Notes to common stock	$ 1	$ 1
Initial conversion price | $ / shares	$ 56.53	$ 56.61
Rate of conversion price	130.00%
Debt instrument, convertible, threshold consecutive trading days | Tradingday	30
Debt instrument, convertible, threshold trading days | Tradingday	20

Commitments, Guarantees and C_2

Commitments, Guarantees and Contingencies (Details Textual) $ in Millions	3 Months Ended
	Mar. 31, 2021USD ($)
Other Commitments [Line Items]
Restricted assets used to collateralize guarantees	$ 2.9
Money transmitter bonds	$ 15
Warranty Period	90 days
Surety Bond
Other Commitments [Line Items]
Restricted assets used to collateralize guarantees	$ 4.4
Cash equivalents
Other Commitments [Line Items]
Restricted assets used to collateralize guarantees	1.9
Other Non-current Assets
Other Commitments [Line Items]
Restricted assets used to collateralize guarantees	$ 1

Earnings Per Common Share - Rec

Earnings Per Common Share - Reconciliation of the Basic and Diluted EPS Denominators (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reconciliation of the basic and diluted EPS denominators
Basic weighted-average common shares	31,844	31,994
Dilutive effect of restricted common stock	302	364
Diluted weighted-average common shares	32,146	32,358

Earnings Per Common Share (Deta

Earnings Per Common Share (Details Textual) - $ / shares	Mar. 31, 2021	Dec. 31, 2014
Earnings Per Share [Abstract]
Common stock warrants issued, per warrant	$ 26.68	$ 26.68

Stockholders' Equity and Equi_3

Stockholders' Equity and Equity Compensation Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2014
Stockholders Equity And Equity Compensation Plans [Line Items]
Remaining number of shares available for repurchase	4,200,000
Repurchase of common stock for employee tax withholdings, shares	110,000	157,000
Repurchase of common stock for tax withholdings, value	$ 5,200	$ 7,600
Cash dividends declared per common share	$ 0.25	$ 0.235
Cash dividend	$ 8,200	$ 7,700
Stock warrants term			10 years
Stock warrants, exercise price	$ 26.68		$ 26.68
Stock-based compensation expense	$ 5,395	4,857
Performance Shares
Stockholders Equity And Equity Compensation Plans [Line Items]
Performance based awards granted to executive management and certain key employees shares	100,000
Vesting maturity date	first quarter of 2023
Vesting period	2 years
Restricted common stock
Stockholders Equity And Equity Compensation Plans [Line Items]
Vesting period	4 years
Separation Agreement
Stockholders Equity And Equity Compensation Plans [Line Items]
Stock-based compensation expense	$ 5,400	$ 4,900
Comcast
Stockholders Equity And Equity Compensation Plans [Line Items]
Issuance of stock warrants			2,900,000
Stock warrants issued	1,000,000
Stock warrants vested	0
SEC Rule 10b5-1 Plan
Stockholders Equity And Equity Compensation Plans [Line Items]
Repurchase of common stock, shares	142,000	142,000
Total amount paid	$ 6,500	$ 6,400
Weighted-average price per share	$ 45.94	$ 45.26

Stockholders' Equity and Equi_4

Stockholders' Equity and Equity Compensation Plans - Summary of Unvested Restricted Common Stock Activity (Details) - Restricted common stock shares in Thousands	3 Months Ended
	Mar. 31, 2021$ / sharesshares
Shares
Shares, Unvested awards, beginning balance | shares	1,041
Shares, Awards granted | shares	513
Shares, Awards forfeited/cancelled | shares	(2)
Shares, Awards vested | shares	(340)
Shares, Unvested awards, ending balance | shares	1,212
Weighted-Average Grant Date Fair Value
Weighted-Average Grant Date Fair Value, Unvested awards, beginning balance | $ / shares	$ 41.31
Weighted-Average Grant Date Fair Value, Awards granted | $ / shares	47.88
Weighted-Average Grant Date Fair Value, Awards forfeited/cancelled | $ / shares	40.81
Weighted-Average Grant Date Fair Value, Awards vested | $ / shares	41.65
Weighted-Average Grant Date Fair Value, Unvested awards, ending balance | $ / shares	$ 43.87