Condensed Consolidated Balance Sheet (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current Assets:
Cash	$ 0	$ 0
Receivables:
Affiliates	721	1,109
Advances to affiliate	244,816	395,247
Trade and other	151,186	170,422
Transportation and exchange gas receivables	1,669	3,205
Inventories	56,159	40,027
Regulatory assets	103,677	97,149
Other	15,306	12,508
Total current assets	573,534	719,667
Investments, at cost plus equity in undistributed earnings	27,824	28,505
Property, Plant and Equipment:
Natural gas transmission plant	15,606,560	13,771,183
Less-Accumulated depreciation and amortization	4,064,910	3,859,520
Total property, plant and equipment, net	11,541,650	9,911,663
Other Assets:
Regulatory assets	281,457	276,315
Other	168,346	141,786
Total other assets	449,803	418,101
Total Assets	12,592,811	11,077,936
Payables:
Affiliates	42,185	43,420
Trade and other	264,588	469,153
Transportation and exchange gas payables	1,888	2,121
Accrued liabilities	177,389	173,602
Long-term debt due within one year	1,681	251,430
Total current liabilities	487,731	939,726
Long-Term Debt	3,204,044	2,191,576
Other Long-Term Liabilities:
Asset retirement obligations	327,760	350,280
Regulatory liabilities	1,010,647	990,702
Advances for construction costs	789,762	426,771
Deferred revenue	228,807	236,729
Other	4,528	4,828
Total other long-term liabilities	2,361,504	2,009,310
Contingent Liabilities and Commitments (Note 3)
Members' Equity
Member's capital	4,428,499	4,088,499
Retained earnings	2,110,124	1,848,488
Accumulated other comprehensive income	909	337
Total member's equity	6,539,532	5,937,324
Total liabilities and member's equity	$ 12,592,811	$ 11,077,936