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Details of Selected Balance Sheet Accounts | 6 Months Ended
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Jun. 30, 2022
Details of Selected Balance Sheet Accounts [Abstract] |
Details of Selected Balance Sheet Accounts | Details of Selected Balance Sheet Accounts Additional information regarding selected balance sheet accounts as of June 30, 2022 and December 31, 2021 is presented below (in thousands):
| June 30, 2022 |  | December 31, 2021
Accounts receivable, net: |  |  |
Trade | $ | 135,121 |  |  | $ | 116,434 |
Unbilled revenue | 21,640 |  |  | 24,389 |
Contract assets | 42,876 |  |  | 39,755 |
Other | 9,916 |  |  | 9,973 |
Total accounts receivable | 209,553 |  |  | 190,551 |
Allowance for doubtful accounts | (5,166) |  |  | (4,471) |
| $ | 204,387 |  |  | $ | 186,080 |
Allowance for doubtful accounts as a percentage of total accounts receivable | 2 | % |  | 2 | %
| June 30, 2022 |  | December 31, 2021
Deferred revenue (contract liabilities) | $ | 47,883 |  |  | $43,236
As of June 30, 2022, accounts receivable, net in the United States and the United Kingdom represented 74% and 14%, respectively, of the total. No other country or single customer accounted for more than 10% of the Company's total accounts receivable as of June 30, 2022. For the six months ended June 30, 2022, the $3.1 million net increase in contract assets was attributable to $30.1 million in revenue recognized during the period, which was partially offset by $26.7 million transferred to accounts receivable. Deferred revenue (contract liabilities) increased by $4.6 million in the first six months of 2022, reflecting $16.2 million in new customer billings which were not recognized as revenue during the period, partially offset by the recognition of $11.2 million of revenue that was deferred at the beginning of the period. The following provides a summary of activity in the allowance for doubtful accounts for the six months ended June 30, 2022 and 2021 (in thousands):
| Six Months Ended June 30,
| 2022 |  | 2021
Allowance for doubtful accounts – January 1 | $ | 4,471 |  |  | $ | 8,304 |
Provisions | 1,044 |  |  | 61 |
Write-offs | (629) |  |  | (815) |
Other | 280 |  |  | 148 |
Allowance for doubtful accounts – June 30 | $ | 5,166 |  |  | $ | 7,698 |
| June 30, 2022 |  | December 31, 2021
Inventories, net: |  |  |
Finished goods and purchased products | $ | 90,948 |  |  | $ | 87,934 |
Work in process | 31,464 |  |  | 24,722 |
Raw materials | 94,558 |  |  | 96,357 |
Total inventories | 216,970 |  |  | 209,013 |
Allowance for excess or obsolete inventory | (37,151) |  |  | (40,440) |
| $ | 179,819 |  |  | $ | 168,573 |
|  |  | June 30, 2022 |  | December 31, 2021
Property, plant and equipment, net: |  |  |  |  |  |  |  |  |
Property, plant and equipment |  | $ | 1,126,777 |  |  | $ | 1,151,533 |
Accumulated depreciation |  | (811,879) |  |  | (812,950) |
|  |  |  |  |  |  | $ | 314,898 |  |  | $ | 338,583 |
For the three months ended June 30, 2022 and 2021, depreciation expense was $12.0 million and $15.6 million, respectively. Depreciation expense was $24.6 million and $32.0 million, respectively, for the six months ended June 30, 2022 and 2021. During the first and second quarters of 2021, the Well Site Services segment recognized non-cash fixed and operating lease asset impairment charges of $0.7 million and $2.8 million, respectively, associated with the closure of additional facilities coupled with other management actions. During the second quarter of 2021, the segment also recorded an additional $1.9 million charge associated with the exit of a leased facility.
| June 30, 2022 |  | December 31, 2021
Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Other intangible assets: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 170,933 |  |  | $ | 72,305 |  |  | $ | 98,628 |  |  | $ | 168,284 |  |  | $ | 66,734 |  |  | $ | 101,550 |
Patents/Technology/Know-how | 79,872 |  |  | 36,234 |  |  | 43,638 |  |  | 78,821 |  |  | 33,151 |  |  | 45,670 |
Tradenames and other | 54,158 |  |  | 16,833 |  |  | 37,325 |  |  | 53,708 |  |  | 15,179 |  |  | 38,529 |
| $ | 304,963 |  |  | $ | 125,372 |  |  | $ | 179,591 |  |  | $ | 300,813 |  |  | $ | 115,064 |  |  | $ | 185,749 |
For the three months ended June 30, 2022 and 2021, amortization expense was $5.3 million and $5.3 million, respectively. Amortization expense was $10.4 million and $10.5 million for the six months ended June 30, 2022 and 2021, respectively.
| June 30, 2022 |  | December 31, 2021
Other noncurrent assets: |  |  |
Deferred compensation plan | $ | 19,015 |  |  | $ | 23,348 |
Deferred financing costs | 2,308 |  |  | 2,674 |
Deferred income taxes | 1,269 |  |  | 1,878 |
Other | 4,760 |  |  | 4,989 |
| $ | 27,352 |  |  | $ | 32,889 |
| June 30, 2022 |  | December 31, 2021
Accrued liabilities: |  |  |
Accrued compensation | $ | 20,924 |  |  | $ | 20,904 |
Accrued taxes, other than income taxes | 7,579 |  |  | 5,130 |
Insurance liabilities | 5,073 |  |  | 6,361 |
Accrued interest | 3,982 |  |  | 3,629 |
Accrued commissions | 2,380 |  |  | 2,194 |
Other | 6,406 |  |  | 5,183 |
| $ | 46,344 |  |  | $ | 43,401 |

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- Definition Details of Selected Balance Sheet Accounts [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI https://asc.fasb.org/topic&trid=2122208 + Details
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