Condensed Consolidated Balance Sheet (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current Assets:
Cash	$ 0	$ 0
Receivables:
Affiliates	809	1,109
Advances to affiliate	589,133	395,247
Trade and other	165,369	170,422
Transportation and exchange gas receivables	8,137	3,205
Inventories	59,821	40,027
Regulatory assets	107,853	97,149
Other	17,880	12,508
Total current assets	949,002	719,667
Investments, at cost plus equity in undistributed earnings	27,833	28,505
Property, Plant and Equipment:
Natural gas transmission plant	15,215,789	13,771,183
Less-Accumulated depreciation and amortization	4,005,315	3,859,520
Total property, plant and equipment, net	11,210,474	9,911,663
Other Assets:
Regulatory assets	283,986	276,315
Other	161,828	141,786
Total other assets	445,814	418,101
Total Assets	12,633,123	11,077,936
Payables:
Affiliates	33,356	43,420
Trade and other	425,033	469,153
Transportation and exchange gas payables	3,411	2,121
Accrued liabilities	188,822	173,602
Long-term debt due within one year	1,642	251,430
Total current liabilities	652,264	939,726
Long-Term Debt	3,199,991	2,191,576
Other Long-Term Liabilities:
Asset retirement obligations	352,379	350,280
Regulatory liabilities	991,895	990,702
Advances for construction costs	739,953	426,771
Deferred revenue	231,450	236,729
Other	5,205	4,828
Total other long-term liabilities	2,320,882	2,009,310
Contingent Liabilities and Commitments (Note 3)
Members' Equity
Member's capital	4,428,499	4,088,499
Retained earnings	2,030,626	1,848,488
Accumulated other comprehensive income	861	337
Total member's equity	6,459,986	5,937,324
Total liabilities and member's equity	$ 12,633,123	$ 11,077,936