Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Utility plant:
Gas plant	$ 5,398,729	$ 5,252,469
Less: accumulated depreciation	(1,928,978)	(1,868,504)
Acquisition adjustments, net	640	730
Construction work in progress	74,884	101,413
Net utility plant	3,545,275	3,486,108
Other property and investments	267,763	260,871
Restricted cash	16,649
Current assets:
Cash and cash equivalents	26,890	41,077
Accounts receivable, net of allowances	183,472	219,469
Accrued utility revenue	31,600	72,700
Income taxes receivable, net	4,283	3,790
Deferred income taxes		31,130
Deferred purchased gas costs	80,441	18,217
Prepaids and other current assets	83,805	108,289
Total current assets	410,491	494,672
Deferred charges and other assets	322,111	323,523
Total assets	4,562,289	4,565,174
Capitalization:
Common stock, $1 par (authorized - 60,000,000 shares; issued and outstanding - 46,503,111 and 46,356,125 shares)	48,133	47,986
Additional paid-in capital	844,851	840,521
Accumulated other comprehensive income (loss), net	(39,638)	(41,698)
Retained earnings	613,760	567,714
Total Southwest Gas Corporation equity	1,467,106	1,414,523
Noncontrolling interest	(2,214)	(2,128)
Total equity	1,464,892	1,412,395
Long-term debt, less current maturities	1,365,926	1,381,327
Total capitalization	2,830,818	2,793,722
Current liabilities:
Current maturities of long-term debt	23,741	11,105
Accounts payable	94,400	183,511
Customer deposits	72,896	73,367
Accrued general taxes	35,657	39,681
Accrued interest	18,187	17,920
Deferred income taxes	5,566
Other current liabilities	132,165	108,580
Total current liabilities	382,612	434,164
Deferred income taxes and other credits:
Deferred income taxes and investment tax credits	663,470	674,411
Taxes payable		284
Accumulated removal costs	291,000	279,000
Other deferred credits	394,389	383,593
Total deferred income taxes and other credits	1,348,859	1,337,288
Total capitalization and liabilities	$ 4,562,289	$ 4,565,174