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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule Of Effective Income Tax Rate Reconciliation
The Company’s income tax expense differs from the income tax expense computed by applying the U.S. federal statutory corporate income tax rate of 21% for the three and six months ended June 30, 2018 and 35% for the three and six months ended June 30, 2017, to income before income taxes as follows:
 
 
 Three Months Ended
June 30,
 
 Six Months Ended
June 30,
 
 
2018
 
2017
 
2018
 
2017
 
 
(In thousands)
Income before income taxes
 

$35,792

 

$56,306

 

$63,603

 

$96,327

Income tax expense at the statutory rate
 
(7,517
)
 
(19,707
)
 
(13,357
)
 
(33,714
)
State income tax expense, net of U.S. federal income taxes
 
(487
)
 
(1,017
)
 
(806
)
 
(1,727
)
Tax shortfalls from stock-based compensation expense
 
(16
)
 
(164
)
 
(2,542
)
 
(2,756
)
Decrease in deferred tax assets valuation allowance
 
8,048

 
20,948

 
16,449

 
38,317

Other
 
(511
)
 
(60
)
 
(546
)
 
(120
)
Income tax expense
 

($483
)
 

$—

 

($802
)
 

$—