Accounts Receivable: Accounts Receivable (Tables)

6 Months Ended

Jun. 30, 2015

Receivables [Abstract]

Accounts Receivable and Allowance for Doubtful Accounts

Following is a summary of Accounts receivable, net included in the accompanying Condensed Consolidated Balance Sheets (in thousands) as of:

	Accounts		Unbilled		Less Allowance for			Accounts
June 30, 2015	Receivable, Trade		Revenue		Doubtful Accounts			Receivable, net
Electric Utilities	$	46,381	$	33,501	$	(685	)	$	79,197
Gas Utilities	25,635		9,418		(1,259		)	33,794
Power Generation	1,199		—		—			1,199
Coal Mining	3,402		—		—			3,402
Oil and Gas	5,099		—		(13		)	5,086
Corporate	983		—		—			983
Total	$	82,699	$	42,919	$	(1,957	)	$	123,661

	Accounts		Unbilled		Less Allowance for			Accounts
December 31, 2014	Receivable, Trade		Revenue		Doubtful Accounts			Receivable, net
Electric Utilities	$	59,714	$	26,474	$	(722	)	$	85,466
Gas Utilities	47,394		45,546		(781		)	92,159
Power Generation	1,369		—		—			1,369
Coal Mining	3,151		—		—			3,151
Oil and Gas	5,305		—		(13		)	5,292
Corporate	2,555		—		—			2,555
Total	$	119,488	$	72,020	$	(1,516	)	$	189,992

	Accounts		Unbilled		Less Allowance for			Accounts
June 30, 2014	Receivable, Trade		Revenue		Doubtful Accounts			Receivable, net
Electric Utilities	$	48,333	$	21,716	$	(622	)	$	69,427
Gas Utilities	43,104		9,265		(1,027		)	51,342
Power Generation	1,388		—		—			1,388
Coal Mining	1,866		—		—			1,866
Oil and Gas	9,123		—		(13		)	9,110
Corporate	2,012		—		—			2,012
Total	$	105,826	$	30,981	$	(1,662	)	$	135,145