Nature of operations and summary of significant accounting policies Nature of operations and summary of significant accounting policies (Tables)

9 Months Ended

Sep. 30, 2014

Accounting Policies [Abstract]

Components of accounts receivable

Accounts receivable consisted of the following at September 30, 2014 and December 31, 2013:

	September 30, 2014			December 31, 2013
Joint interests	$	36,644		$	31,335
Accrued commodity sales	65,304			60,768
Derivative settlements	1,041			4,616
Production tax credit	2,703			694
Other	6,192			698
Allowance for doubtful accounts	(311		)	(1,596		)
	$	111,573		$	96,515

Components of inventory

Inventories at September 30, 2014 and December 31, 2013 consisted of the following:

	September 30, 2014			December 31, 2013
Equipment inventory	$	22,503		$	13,657
Commodities	2,433			3,186
Inventory valuation allowance	(911		)	(706		)
	$	24,025		$	16,137