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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2015
Income Taxes [Abstract]  
Tax provision (benefit)
The effect of the change in valuation allowance on the provision for income taxes was as follows:
 
  
Three months ended June 30,
  
Six months ended June 30,
 
  
2015
  
2014
  
2015
  
2014
 
  
(In thousands)
 
         
Provision for income tax
 
$
39,991
  
$
17,172
  
$
87,874
  
$
40,292
 
Change in valuation allowance
  
(38,669
)
  
(16,054
)
  
(83,167
)
  
(38,448
)
                 
Provision for income taxes
 
$
1,322
  
$
1,118
  
$
4,707
  
$
1,844