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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of provision for income taxes
The provision for income taxes for the three and nine months ended September 30, 2018, and 2017, consisted of the following:
 
For the Three Months Ended 
 September 30,
 
For the Nine Months Ended 
 September 30,
 
2018
 
2017
 
2018
 
2017
 
(in thousands)
Current portion of income tax (expense) benefit:
 
 
 
 
 
 
 
Federal
$
—

 
$
2,832

 
$
—

 
$
—

State
(85
)
 
(230
)
 
(670
)
 
(1,633
)
Deferred portion of income tax (expense) benefit
36,833

 
36,668

 
(60,672
)
 
67,458

Income tax (expense) benefit
$
36,748

 
$
39,270

 
$
(61,342
)
 
$
65,825

Effective tax rate
21.3
%
 
30.6
%
 
23.6
%
 
32.8
%