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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]  
Tax Provisions before Discrete Items Reconciled to Recorded Provision for (Benefits from) Income Taxes
Our tax provision for income taxes before discrete items is reconciled to our recorded provision for income taxes, as follows (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Provision for income taxes before discrete items
$
4,457

 
$
1,571

 
$
1,037

 
$
2,653

Interest related to unrecognized tax benefits
113

 
64

 
225

 
99

Provision for (benefit from) stock based compensation, including ESPP dispositions
49

 
(771
)
 
26

 
(2,339
)
Benefit from reversals of uncertain tax positions
(46
)
 
—

 
(233
)
 
—

Provision for (benefit from) reassessment of taxes upon filing tax returns
(41
)
 
157

 
(41
)
 
72

Provision for (benefit from) reassessment of taxes upon tax law change
—

 
—

 
161

 
(481
)
Provision for deemed repatriation transition tax
—

 
—

 
1,222

 
—

Provision for income taxes
$
4,532

 
$
1,021

 
$
2,397

 
$
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