Income Taxes Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

Income tax expense consisted of the following:

A reconciliation of the federal statutory tax rate to the effective tax rate is as follows:



	Successor				Predecessor
	Year Ended December 31, 2014		December 17, 2013 through December 31, 2013		January 1, 2013 through December 16, 2013		Year Ended December 31, 2012

Federal statutory rate	35	%	35	%	35	%	35	%
State, net of federal tax benefit	—		—		3		3
Income excluded from nontaxable entities	(35	)	(35	)	—		—
Deferred state rate impact	—		—		—		(1	)
Research and development credits	—		—		—		(3	)
Net impact to uncertain income tax positions	—		—		(2	)	—
Transaction costs	—		—		4		—
Other	—		—		1		—
Effective rate	—	%	—	%	41	%	34	%

Significant components of the deferred tax assets and liabilities are as follows:



	Successor		Predecessor
	December 31, 2014		December 31, 2013
(in thousands)
Deferred tax assets:
Net operating loss carryforwards	$	—	$	—
Other	—		—
	—		—
Deferred tax liabilities:
Property and equipment principally due to differences in depreciation	—		—
Other	69		—
	69		—
Net deferred tax liabilities	$	69	$	—

Changes in the balance of unrecognized tax benefits, excluding interest and penalties on uncertain tax positions, were as follows:



	Successor				Predecessor
	Year Ended December 31, 2014		December 17, 2013 through December 31, 2013		January 1, 2013 through December 16, 2013			Year Ended December 31, 2012
(in thousands)
Unrecognized tax benefits at beginning of period	$	—	$	—	$	22,553		$	2,864
Increases for positions taken in current year	—		—		50			21
Increases (decreases) for positions taken in a prior year	—		—		(635		)	20,458
Decreases for settlements with taxing authorities	—		—		—			—
Decreases for lapses in the applicable statute of limitations	—		—		(1,862		)	(790		)
Unrecognized tax benefits at end of period	$	—	$	—	$	20,106		$	22,553