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Fair Value of Financial Instruments and Concentrations of Credit Risk
12 Months Ended
Dec. 31, 2019
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 2021 Convertible Notes, approximated their fair values at December 31, 2019 and 2018. The estimated fair value of our 2021 Convertible Notes was $101.4 million and $120.9 million at December 31, 2019 and 2018, respectively, 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 consist principally of cash and trade accounts receivable. At December 31, 2019, 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.
Receivables
Receivables consisted of the following at December 31:
(In thousands)
2019
 
2018
Trade receivables:
 
 
 
Gross trade receivables
$
207,554

 
$
248,176

Allowance for doubtful accounts
(6,007
)
 
(10,034
)
Net trade receivables
201,547

 
238,142

Income tax receivables
7,393

 
9,027

Other receivables
7,774

 
7,225

Total receivables, net
$
216,714

 
$
254,394


Other receivables included $6.2 million and $6.3 million for value added, goods and service taxes related to foreign jurisdictions as of December 31, 2019 and 2018, respectively.
Customer Revenue Concentration
We derive a significant portion of our revenues from companies in the E&P industry, and our customer base is highly concentrated in mid-sized and international oil companies as well as government-owned or government-controlled oil companies operating in the markets that we serve. For 2019, 2018 and 2017, revenues from our 20 largest customers represented approximately 42%, 44% and 45%, respectively, of our consolidated revenues. For 2019, 2018 and 2017, no single customer accounted for more than 10% of our consolidated revenues.
We maintain an allowance for doubtful accounts based upon the expected collectability of accounts receivable. Changes in this allowance were as follows:
(In thousands)
2019
 
2018
 
2017
Balance at beginning of year
$
10,034

 
$
9,457

 
$
8,849

Provision for doubtful accounts
1,792

 
2,849

 
1,481

Write-offs, net of recoveries
(5,819
)
 
(2,272
)
 
(873
)
Balance at end of year
$
6,007

 
$
10,034

 
$
9,457