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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2019
Income Tax Disclosure [Abstract]  
Schedule of provision for income taxes [Table Text Block]
The provision for income taxes for the three and six months ended June 30, 2019, and 2018, consisted of the following:
 
For the Three Months Ended
June 30,
 
For the Six Months Ended
June 30,
 
2019
 
2018
 
2019
 
2018
 
(in thousands)
Current portion of income tax (expense) benefit:
 
 
 
 
 
 
 
Federal
$
—

 
$
—

 
$
—

 
$
—

State
176

 
40

 
(789
)
 
(585
)
Deferred portion of income tax (expense) benefit
(13,766
)
 
861

 
33,237

 
(97,505
)
Income tax (expense) benefit
$
(13,590
)
 
$
901

 
$
32,448

 
$
(98,090
)
Effective tax rate
21.2
%
 
(5.5
)%
 
20.3
%
 
22.7
%