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Fair Value of Financial Instruments and Concentrations of Credit Risk
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments and Concentrations of Credit Risk Fair Value of Financial Instruments and Concentrations of Credit Risk
Fair Value of Financial Instruments
Our financial instruments include cash and cash equivalents, receivables, payables, and debt. We believe the carrying values of these instruments, with the exception of our Convertible Notes, approximated their fair values at December 31, 2020 and 2019. The estimated fair value of our Convertible Notes was $61.1 million at December 31, 2020 and $101.4 million at December 31, 2019, based on quoted market prices at these respective dates.
Concentrations of Credit Risk
Financial instruments that potentially subject us to significant concentrations of credit risk primarily consist of cash and trade accounts receivable. At December 31, 2020, substantially all of our cash deposits were held by our international subsidiaries in accounts at numerous financial institutions across the various regions in which we operate. A majority of the cash was held in accounts that maintain deposit ratings of P-1 by Moody’s, A-1 by Standard and Poor’s, and F1 by Fitch. As part of our investment strategy, we perform periodic evaluations of the relative credit standing of these financial institutions.
Customer Revenue Concentration
We derive a significant portion of our revenues from companies in the E&P industry, and our E&P customer base consists primarily of mid-sized and international oil companies as well as government-owned or government-controlled oil companies operating in the markets that we serve. For 2020, 2019 and 2018, revenues from our 20 largest customers represented approximately 49%, 42% and 44%, respectively, of our consolidated revenues. For 2020, 2019 and 2018, no single customer accounted for more than 10% of our consolidated revenues.
Receivables
Receivables consisted of the following at December 31:
(In thousands)20202019
Trade receivables:
Gross trade receivables$133,717 $207,554 
Allowance for credit losses(5,024)(6,007)
Net trade receivables128,693 201,547 
Income tax receivables6,545 7,393 
Other receivables5,807 7,774 
Total receivables, net$141,045 $216,714 

Other receivables include $4.4 million and $6.2 million for value added, goods and service taxes related to foreign jurisdictions as of December 31, 2020 and 2019, respectively.
We adopted the new accounting guidance for credit losses as of January 1, 2020 (see Note 1 for additional information). To measure expected credit losses, we evaluate our receivables on a collective basis for assets that share similar risk characteristics. Our allowance for credit losses reflects losses that are expected over the contractual life of the asset, and takes into account historical loss experience, current and future economic conditions, and reasonable and supportable forecasts.
Changes in our allowance for credit losses were as follows:
(In thousands)202020192018
Balance at beginning of year$6,007 $10,034 $9,457 
Cumulative effect of accounting change959 — — 
Credit loss expense1,427 1,792 2,849 
Write-offs, net of recoveries(3,369)(5,819)(2,272)
Balance at end of year$5,024 $6,007 $10,034