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SUPPLEMENTAL BALANCE SHEET INFORMATION | 12 Months Ended
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Sep. 30, 2018
SUPPLEMENTAL BALANCE SHEET INFORMATION |
SUPPLEMENTAL BALANCE SHEET INFORMATION | NOTE 14 SUPPLEMENTAL BALANCE SHEET INFORMATION The following reflects the activity in our reserve for bad debt for fiscal years 2018, 2017 and 2016:
|  | 2018 |  | 2017 |  | 2016
|  | (in thousands)
Reserve for bad debt: |  |  |  |  |  |  |  |  |
Balance at October 1, |  | $ | 5,721 |  | $ | 2,696 |  | $ | 6,181
Provision for (recovery of) bad debt |  |  | 2,193 |  |  | 2,016 |  |  | (2,013)
(Write-off) recovery of bad debt |  |  | (1,697) |  |  | 1,009 |  |  | (1,472)
Balance at September 30, |  | $ | 6,217 |  | $ | 5,721 |  | $ | 2,696
Accounts receivable, prepaid expenses and other current assets, accrued liabilities and long-term liabilities at September 30, 2018 and 2017 consist of the following:
|  | September 30,
|  | 2018 |  | 2017
|  | (in thousands)
Accounts receivable, net of reserve: |  |  |  |  |  |
Trade receivables |  | $ | 530,859 |  | $ | 398,348
Income tax receivable |  |  | 34,343 |  |  | 78,726
Total accounts receivable, net of reserve |  | $ | 565,202 |  | $ | 477,074
Prepaid expenses and other current assets: |  |  |  |  |  |
Restricted cash |  | $ | 39,830 |  | $ | 32,439
Deferred mobilization |  |  | 6,484 |  |  | 6,458
Prepaid insurance |  |  | 6,149 |  |  | 4,060
Prepaid value added tax |  |  | 1,931 |  |  | 3,870
Prepaid maintenance and rent |  |  | 8,526 |  |  | 5,940
Prepaid multi-flex rig fabrication |  |  | 1,327 |  |  | —
Other |  |  | 2,151 |  |  | 2,356
Total prepaid expenses and other current assets |  | $ | 66,398 |  | $ | 55,123
Accrued liabilities: |  |  |  |  |  |
Accrued operating costs |  | $ | 37,528 |  | $ | 36,949
Payroll and employee benefits |  |  | 80,915 |  |  | 54,941
Taxes payable, other than income tax |  |  | 50,683 |  |  | 35,638
Self-insurance liabilities |  |  | 15,887 |  |  | 22,159
Deferred income |  |  | 20,527 |  |  | 25,893
Deferred mobilization |  |  | 9,662 |  |  | 9,828
Accrued income taxes |  |  | 7,375 |  |  | 8,011
Escrow |  |  | 11,258 |  |  | 4,690
Litigation and claims |  |  | 1,749 |  |  | 1,779
Other |  |  | 8,920 |  |  | 8,869
Total accrued liabilities |  | $ | 244,504 |  | $ | 208,757
Noncurrent liabilities — Other: |  |  |  |  |  |
Pension and other non-qualified retirement plans |  | $ | 35,051 |  | $ | 37,989
Self-insurance liabilities |  |  | 39,380 |  |  | 29,037
Contingent earnout liability |  |  | 11,160 |  |  | 14,879
Deferred mobilization |  |  | 2,738 |  |  | 7,689
Uncertain tax positions including interest and penalties |  |  | 2,870 |  |  | 3,562
Other |  |  | 2,407 |  |  | 8,253
Total noncurrent liabilities — other |  | $ | 93,606 |  | $ | 101,409

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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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