Condensed Consolidated Balance Sheet (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current Assets:
Cash	$ 0	$ 0
Receivables:
Affiliates	399	1,018
Advances to affiliate	0	33,034
Trade and other	234,245	201,198
Transportation and exchange gas receivables	6,339	4,515
Inventories	67,736	63,205
Regulatory assets	103,903	95,770
Other	7,474	12,574
Total current assets	420,096	411,314
Investments, at cost plus equity in undistributed earnings	25,815	26,520
Property, Plant and Equipment:
Natural gas transmission plant	16,073,782	15,908,878
Less-Accumulated depreciation and amortization	4,240,363	4,147,729
Total property, plant and equipment, net	11,833,419	11,761,149
Other Assets:
Regulatory assets	273,733	289,479
Right-of-use assets	89,824	0
Other	187,070	167,490
Total other assets	550,627	456,969
Total Assets	12,829,957	12,655,952
Payables:
Affiliates	46,485	50,727
Advances from affiliates	86,580	0
Trade and other	165,998	226,911
Transportation and exchange gas payables	3,480	5,973
Regulatory liabilities	44,226	5,097
Accrued liabilities	208,382	218,384
Long-term debt due within one year	15,810	15,419
Total current liabilities	570,961	522,511
Long-Term Debt	4,003,258	3,998,988
Other Long-Term Liabilities:
Asset retirement obligations	366,945	348,609
Regulatory liabilities	991,779	1,026,892
Deferred revenue	223,526	226,164
Lease liability	85,759	0
Other	5,657	4,188
Total other long-term liabilities	1,673,666	1,605,853
Contingent Liabilities and Commitments (Note 4)
Members' Equity
Member's capital	4,428,499	4,428,499
Retained earnings	2,153,269	2,099,567
Accumulated other comprehensive income	304	534
Total member's equity	6,582,072	6,528,600
Total liabilities and member's equity	$ 12,829,957	$ 12,655,952