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SUPPLEMENTAL BALANCE SHEET INFORMATION | 12 Months Ended
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Sep. 30, 2017
SUPPLEMENTAL BALANCE SHEET INFORMATION |
SUPPLEMENTAL BALANCE SHEET INFORMATION | NOTE 11 SUPPLEMENTAL BALANCE SHEET INFORMATION The following reflects the activity in our reserve for bad debt for 2017, 2016 and 2015:
|  | September 30, |
|  | 2017 |  | 2016 |  | 2015 |
|  | (in thousands) |
Reserve for bad debt: |  |  |  |  |  |  |  |  |  |
Balance at October 1, |  | $ | 2,696 |  | $ | 6,181 |  | $ | 4,597 |
Provision for (recovery of) bad debt |  |  | 2,016 |  |  | (2,013) |  |  | 6,034 |
(Write-off) recovery of bad debt |  |  | 1,009 |  |  | (1,472) |  |  | (4,450) |
Balance at September 30, |  | $ | 5,721 |  | $ | 2,696 |  | $ | 6,181 |
Accounts receivable, prepaid expenses and other current assets, accrued liabilities and long-term liabilities at September 30 consist of the following:
|  | September 30,
|  | 2017 |  | 2016
|  | (in thousands)
Accounts receivable, net of reserve: |  |  |  |  |  |
Trade receivables |  | $ | 398,348 |  | $ | 286,998
Income tax receivable |  |  | 78,726 |  |  | 37,971
Insurance recovery receivable |  |  | — |  |  | 50,200
Total accounts receivable, net of reserve |  | $ | 477,074 |  | $ | 375,169
Prepaid expenses and other current assets: |  |  |  |  |  |
Restricted cash |  | $ | 32,439 |  | $ | 27,566
Deferred mobilization |  |  | 6,458 |  |  | 9,913
Prepaid insurance |  |  | 4,060 |  |  | 4,354
Prepaid value added tax |  |  | 3,870 |  |  | 1,407
Prepaid income taxes |  |  | — |  |  | 26,138
Other |  |  | 8,293 |  |  | 8,689
Total prepaid expenses and other current assets |  | $ | 55,120 |  | $ | 78,067
Accrued liabilities: |  |  |  |  |  |
Accrued operating costs |  | $ | 36,949 |  | $ | 17,009
Payroll and employee benefits |  |  | 54,941 |  |  | 43,547
Taxes payable, other than income tax |  |  | 35,638 |  |  | 31,443
Self-insurance liabilities |  |  | 22,159 |  |  | 14,801
Deferred income |  |  | 25,893 |  |  | 34,681
Deferred mobilization |  |  | 9,828 |  |  | 17,923
Accrued income taxes |  |  | 8,011 |  |  | —
Litigation and claims |  |  | 1,779 |  |  | 70,535
Other |  |  | 13,485 |  |  | 4,700
Total accrued liabilities |  | $ | 208,683 |  | $ | 234,639
Noncurrent liabilities — Other: |  |  |  |  |  |
Pension and other non-qualified retirement plans |  | $ | 37,989 |  | $ | 39,762
Self-insurance liabilities |  |  | 29,037 |  |  | 21,651
Contingent earnout liability |  |  | 14,879 |  |  | —
Deferred mobilization |  |  | 7,689 |  |  | 24,781
Uncertain tax positions including interest and penalties |  |  | 3,562 |  |  | 12,502
Other |  |  | 8,253 |  |  | 4,085
Total noncurrent liabilities — other |  | $ | 101,409 |  | $ | 102,781

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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