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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | ---
PROPERTY, PLANT AND EQUIPMENT |  |
Utility plant, at cost | $ 2,400,903 | $ 2,368,914
Construction work in progress | 210,543 | 192,481
Nonutility plant and equipment, at cost | 749,700 | 697,406
Construction work in progress | 19,391 | 45,690
Total property, plant and equipment | 3,380,537 | 3,304,491
Accumulated depreciation and amortization, utility plant | (539,905) | (530,753)
Accumulated depreciation and amortization, nonutility plant and equipment | (130,560) | (122,689)
Property, plant and equipment, net | 2,710,072 | 2,651,049
CURRENT ASSETS |  |
Cash and cash equivalents | 7,694 | 1,458
Customer accounts receivable |  |
Billed | 318,108 | 205,490
Unbilled revenues | 55,155 | 7,199
Allowance for doubtful accounts | (5,882) | (5,704)
Regulatory assets | 18,509 | 18,297
Gas in storage, at average cost | 241,389 | 184,633
Materials and supplies, at average cost | 15,215 | 13,910
Prepaid and accrued taxes | 10,588 | 23,047
Derivatives, at fair value | 55,358 | 27,396
Restricted broker margin accounts | 85,784 | 53,719
Assets held for sale | 207,737 | 206,905
Other | 40,254 | 33,730
Total current assets | 1,049,909 | 770,080
NONCURRENT ASSETS |  |
Investments in equity method investees | 192,188 | 190,866
Regulatory assets | 370,024 | 368,592
Derivatives, at fair value | 6,085 | 10,560
Investments in equity securities | 33,174 | 32,917
Intangible assets, net | 23,007 | 23,375
Other noncurrent assets | 92,863 | 96,225
Total noncurrent assets | 717,341 | 722,535
Total assets | 4,477,322 | 4,143,664
CAPITALIZATION |  |
Common stock, $2.50 par value; authorized 150,000,000 shares; outstanding December 31, 2018 — 88,680,174; September 30, 2018 — 88,292,956 | 226,539 | 226,196
Premium on common stock | 278,286 | 274,748
Accumulated other comprehensive loss, net of tax | (15,822) | (12,610)
Treasury stock at cost and other; shares December 31, 2018 — 1,935,229; September 30, 2018 — 2,185,013 | (65,060) | (76,473)
Retained earnings | 1,073,107 | 1,007,117
Common stock equity | 1,497,050 | 1,418,978
Long-term debt | 1,184,801 | 1,180,619
Total capitalization | 2,681,851 | 2,599,597
CURRENT LIABILITIES |  |
Current maturities of long-term debt | 124,806 | 123,545
Short-term debt | 371,700 | 151,950
Gas purchases payable | 269,966 | 211,303
Gas purchases payable to related parties | 1,150 | 1,150
Accounts payable and other | 75,119 | 135,240
Dividends payable | 25,938 | 25,824
Accrued taxes | 6,137 | 1,568
Regulatory liabilities | 12,822 | 8,185
New Jersey Clean Energy Program | 12,359 | 14,052
Derivatives, at fair value | 65,114 | 46,652
Liabilities held for sale | 4,182 | 4,182
Customers' credit balances and deposits | 29,629 | 27,325
Total current liabilities | 998,922 | 750,976
NONCURRENT LIABILITIES |  |
Deferred income taxes | 233,099 | 242,436
Deferred investment tax credits | 3,895 | 3,976
Deferred gain | 2,144 | 9,104
Derivatives, at fair value | 36,825 | 22,982
Manufactured gas plant remediation | 129,556 | 130,800
Postemployment employee benefit liability | 141,499 | 137,007
Regulatory liabilities | 210,580 | 209,139
Asset retirement obligation | 29,329 | 28,688
Other | 9,622 | 8,959
Total noncurrent liabilities | 796,549 | 793,091
Commitments and contingent liabilities (Note 13) |  |
Total capitalization and liabilities | $ 4,477,322 | $ 4,143,664

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- Definition Amount receivable from broker-dealers and clearing organizations, including, but not limited to, securities failed-to-deliver, certain deposits for securities borrowed, open transactions, good faith and margin deposits, commissions and floor brokerage receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=35710130&loc=d3e41645-110958 + Details
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