Condensed Consolidated Balance Sheet (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current Assets:
Cash	$ 0	$ 0
Receivables:
Affiliates	635	1,084
Advances to affiliate	1,029,254	64,608
Trade and other, less allowance of $54 ($13 in 2015)	134,536	150,256
Transportation and exchange gas receivables	1,705	2,427
Inventories	64,201	56,841
Regulatory assets	86,029	79,575
Other	7,973	15,297
Total current assets	1,324,333	370,088
Investments, at cost plus equity in undistributed earnings	44,119	45,078
Property, Plant and Equipment:
Natural gas transmission plant	11,132,201	10,863,944
Less-Accumulated depreciation and amortization	3,535,447	3,471,775
Total property, plant and equipment, net	7,596,754	7,392,169
Other Assets:
Regulatory assets	261,142	263,730
Other	169,264	73,814
Total other assets	430,406	337,544
Total Assets	9,395,612	8,144,879
Payables:
Affiliates	34,957	38,243
Trade and other	255,109	223,050
Transportation and exchange gas payables	1,077	1,355
Accrued liabilities	125,232	109,230
Long-term debt due within one year	199,987	0
Total current liabilities	616,362	371,878
Long-Term Debt	2,209,951	1,419,574
Other Long-Term Liabilities:
Asset retirement obligations	313,785	299,834
Regulatory liabilities	399,554	382,325
Advances for construction costs	141,520	97,790
Transportation prepayments	12,565	12,806
Other	84,538	4,819
Total other long-term liabilities	$ 951,962	$ 797,574
Contingent Liabilities and Commitments (Note 2)
Owner's Equity:
Member's capital	$ 3,288,499	$ 3,176,499
Retained earnings	2,329,103	2,379,385
Accumulated other comprehensive loss	(265)	(31)
Total owner's equity	5,617,337	5,555,853
Total liabilities and owner's equity	$ 9,395,612	$ 8,144,879