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Comprehensive income (Tables)
 6 Months Ended
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Comprehensive Income (Loss)
The accumulated OCI, net of tax, for the six months ended June 30, 2018 and 2017, consisted of the following:  


 
June 30, 2018

 
(Unaudited)
(In thousands)
 
Currency translation adjustment
 
Investments
 
Derivative instruments
 
Accumulated other comprehensive income/(loss)
Balance as of December 31, 2017
 
$
(12,717
)
 
$
(782
)
 
(3,010
)
 
$
(16,509
)
Current-period other comprehensive (loss)
 income
 
(6,001
)
 
(557
)
 
5,767

 
(791
)
Reclassified from accumulated OCI into income
 
—

 
—

 
2,495

 
2,495

Income tax expense
 
—

 
33

 
1,727

 
1,760

Balance as of June 30, 2018
 
$
(18,718
)
 
$
(1,372
)
 
$
3,525

 
$
(16,565
)


 
June 30, 2017

 
(Unaudited)
(In thousands)
 
Currency translation adjustment
 
Investments
 
Derivative instruments
 
Accumulated other comprehensive income/(loss)
Balance as of December 31, 2016
 
$
(37,174
)
 
$
(669
)
 
3,222

 
$
(34,621
)
Current-period other comprehensive income (loss)
 
15,664

 
26

 
(5,542
)
 
10,148

Reclassified from accumulated OCI into income
 
—

 
—

 
(792
)
 
(792
)
Income tax expense (benefit)
 
120

 
(17
)
 
(2,249
)
 
(2,146
)
Balance as of June 30, 2017
 
$
(21,630
)
 
$
(626
)
 
$
(863
)
 
$
(23,119
)