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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2015
Income Tax Disclosure [Abstract]  
Summary of provision for (benefit from) income taxes
The provision for (benefit from) income taxes consisted of the following (in thousands):

 
Years Ended December 31,
 
2015
 
2014
 
2013
Current tax provision (benefit):
 

 
 

 
 

U.S. federal
$
556

 
$
23

 
$
(310
)
State
1,415

 
(654
)
 
938

Total current
1,971

 
(631
)
 
628

Deferred tax provision (benefit):
 

 
 

 
 

U.S. federal
48,450

 
(23,786
)
 
(18,397
)
State
2,768

 
(3,649
)
 
(71
)
Total deferred
51,218

 
(27,435
)
 
(18,468
)
Provision for (benefit from) income taxes
$
53,189

 
$
(28,066
)
 
$
(17,840
)
Reconciliation of effective tax rate and U.S. statutory rate.
The reasons for the differences between these effective tax rates and the U.S. statutory rate of 35% are as follows (in thousands):

 
Years Ended December 31,
 
2015
 
2014
 
2013
Income taxes at U.S. federal statutory rate of 35%
$
(37,165
)
 
$
(15,813
)
 
$
(7,311
)
Net state income taxes
2,383

 
(5,253
)
 
937

Noncontrolling interest
(2,904
)
 
(11,166
)
 
(12,685
)
Unrecognized tax benefits
698

 
4,063

 
416

Valuation allowances and write off of tax attributes
88,088

 

 

Other
2,089

 
103

 
803

Provision for (benefit from) income taxes
$
53,189

 
$
(28,066
)
 
$
(17,840
)
Tax effects of deferred tax assets and deferred tax liabilities
The tax effects of temporary differences that give rise to deferred tax assets and deferred tax liabilities are as follows (in thousands):

 
December 31,
 
2015
 
2014
Deferred tax assets:
 

 
 

Net operating loss carryforwards
$
8,028

 
$
37,668

Inventory
3,642

 
4,405

Alternative minimum tax credit carryforwards
1,496

 
5,685

Accrued liabilities
11,466

 
7,894

Other
4,913

 

Subtotal
29,545

 
55,652

Valuation allowances
(633
)
 
(633
)
Total deferred tax assets
28,912

 
55,019

Deferred tax liabilities:
 

 
 

Property, plant and equipment
(53,495
)
 
(126,670
)
Basis difference in the Partnership
(148,421
)
 
(136,438
)
Other
(5,562
)
 
(10,583
)
Total deferred tax liabilities
(207,478
)
 
(273,691
)
Net deferred tax liabilities
$
(178,566
)
 
$
(218,672
)
Reconciliation of beginning and ending amount of unrecognized tax benefits
A reconciliation of the beginning and ending amount of unrecognized tax benefits (including discontinued operations) is shown below (in thousands):

 
Years Ended December 31,
 
2015
 
2014
 
2013
Beginning balance
$
14,595

 
$
11,259

 
$
9,597

Additions based on tax positions related to current year
845

 
954

 
365

Additions based on tax positions related to prior years
3,648

 
2,597

 
1,710

Reductions based on settlement with government authority

 

 

Reductions based on lapse of statute of limitations

 
(215
)
 
(97
)
Reductions based on tax positions related to prior years
(592
)
 

 
(316
)
Reductions based on tax positions transferred to Exterran Corp.
(6,498
)
 
$

 
$

Ending balance
$
11,998

 
$
14,595

 
$
11,259