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Other comprehensive income (loss) and accumulated other comprehensive items (Tables)
 6 Months Ended
Jun. 30, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Summary of other comprehensive income (loss) and the changes in accumulated other comprehensive items
The following tables summarize other comprehensive income (loss) and the changes in accumulated other comprehensive items for the three and six months ended June 30, 2017:

 
 
Unrealized
Gains/(Losses)
On
Marketable
Securities, net
of tax
 
Foreign
Currency
Translation
 
Total
Accumulated
Other
Comprehensive
Items
Balance at March 31, 2017
 
$
(225
)
 
$
(651
)
 
$
(876
)
Other comprehensive (loss) income before reclassifications
 
(9
)
 
2,884

 
2,875

Amounts reclassified from other comprehensive items
 
—

 
—

 
—

Other comprehensive (loss) income
 
(9
)
 
2,884

 
2,875

Balance at June 30, 2017
 
$
(234
)
 
$
2,233

 
$
1,999


 
 
Unrealized
Gains/(Losses)
On
Marketable
Securities, net
of tax
 
Foreign
Currency
Translation
 
Total
Accumulated
Other
Comprehensive
Items
Balance at December 31, 2016
 
$
(203
)
 
$
(1,282
)
 
$
(1,485
)
Other comprehensive (loss) income before reclassifications
 
(31
)
 
3,515

 
3,484

Amounts reclassified from other comprehensive items
 
—

 
—

 
—

Other comprehensive (loss) income
 
(31
)
 
3,515

 
3,484

Balance at June 30, 2017
 
$
(234
)
 
$
2,233

 
$
1,999