OIL AND GAS INFORMATION (Tables)

12 Months Ended

Dec. 31, 2013

OIL AND GAS INFORMATION

Schedule of costs related to the oil and gas activities incurred

	2013		2012		2011
	(in thousands)
Property acquisition—unproved	$	—	$	—	$	—
Property acquisition—proved		1,635		5,413		509
Exploration costs		227		52		8,147
Development costs		72,991		65,676		63,675
	$	74,853	$	71,141	$	72,331

Schedule of aggregate capitalized costs relating to the Company's oil and gas activities

	2013		2012
	(in thousands)
Unproved oil and gas properties	$	18,015	$	20,507
Proved oil and gas properties		807,439		730,353
		825,454		750,860
Less accumulated depreciation, depletion, amortization and impairment expense		490,100		449,261
	$	335,354	$	301,599

Schedule of the Company's results of operations from oil and natural gas producing activities

	2013			2012			2011
	(in thousands)
Revenues	$	127,925		$	121,797		$	103,371
Production costs		(36,779	)		(33,072	)		(30,637	)
Accretion of asset retirement obligation		(2,256	)		(1,525	)		(995	)
Depreciation, depletion, amortization		(39,431	)		(43,460	)		(27,914	)
Income from oil and gas producing activities	$	49,459		$	43,740		$	43,825

Summary of Warren's oil and gas properties not subject to amortization

  The following is a summary of Warren's oil and gas properties not subject to amortization as of December 31, 2013:

	Costs incurred in
	Fiscal year 2013		Fiscal year 2012		Fiscal year 2011		Prior to 2011		Total
	(in thousands)
Acquisition costs	$	—	$	—	$	—	$	834	$	834
Exploration costs		—		—		60		—		60
Development costs(1)		126		311		161		16,523		17,121
Total oil and gas properties not subject to amortization	$	126	$	311	$	221	$	17,357	$	18,015

(1)

The Company's development costs primarily reflect investment in well cellars and facilities in its Wilmington oil field to facilitate the development of future oil wells. These costs will be allocated to future wells drilled, the majority of these wells are expected to be drilling during the next five to eight years.