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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2019
Income Tax Disclosure [Abstract]  
Provision for Income Taxes
The (provision for) benefit from income taxes for the years ended December 31, 2019, 2018 and 2017, consists of the following (in thousands):

 201920182017
Current benefit (provision):   
Federal benefit (expense)$86  $164  $(3,031) 
State (expense) benefit(55) 78  (257) 
Total current benefit (provision)31  242  (3,288) 
Deferred benefit (provision):   
Federal benefit (expense)662  (314) 21,575  
Total deferred benefit (expense)662  (314) 21,575  
Total benefit (provision)$693  $(72) $18,287  
Deferred Tax Assets and Liabilities
The income tax effects of temporary differences that give rise to significant portions of deferred income tax assets and (liabilities) as of December 31, 2019 and 2018, are as follows (in thousands):

 20192018
Deferred income tax assets:  
Net operating loss carryover$1,519  $2,730  
Stock compensation580  746  
Deferred compensation$389  $243  
Other321  197  
Total deferred income tax assets$2,809  $3,916  
Deferred income tax liabilities:  
Property and equipment$(33,761) (35,030) 
Goodwill and other intangible assets(291) (573) 
Other—  (219) 
Total deferred income tax liabilities(34,052) (35,822) 
Net deferred income tax liabilities$(31,243) $(31,906) 
Effective Income Tax Rate Reconciliation
The effective tax rate for the years ended December 31, 2019, 2018 and 2017, differs from the statutory rate as follows:

 201920182017
Statutory rate21.0 %21.0 %34.0 %
State and local taxes(3.7)%1.5 %1.5 %
Uncertain tax position— %(139.1)%— %
Goodwill impairment (13.7)%— %— %
Research and development credit1.4 %92.2 %— %
Stock based compensation(0.8)%10.0 %(14.3)%
Nondeductible compensation(0.3)%(7.8)%— %
Domestic production credit — %— %(15.2)%
Other0.9 %3.9 %(1.5)%
Effective rate  4.8 %(18.3)%4.5 %
Deferred re-measurement for rate change— %— %(1218.0)%
Effective rate4.8 %(18.3)%(1213.5)%
Uncertain tax positions
A reconciliation of the beginning and ending amount of uncertain tax positions is as follows (in thousands):

Balance at January 1, 2019$578  
Additions based on tax positions related to current year—  
Reductions for tax positions of prior years(578) 
Balance at December 31, 2019$—