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Comprehensive income
 12 Months Ended
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Comprehensive income Comprehensive income    
Our comprehensive income is comprised of net income, foreign currency translation, unrealized gains and losses on forward contracts and securities classified as available-for-sale. The accumulated other comprehensive income, net of tax, for the years ended December 31, 2019 and 2018, consisted of the following:   
໿

 
December 31, 2019
(In thousands)
 
Currency translation adjustment
 
Investments
 
Derivative instruments
 
Accumulated other comprehensive income (loss)
Balance as of December 31, 2018
 
$
(22,485
)
 
$
(1,308
)
 
$
6,862

 
$
(16,931
)
Current-period other comprehensive (loss) income
 
(3,346
)
 
1,141

 
(13,473
)
 
(15,678
)
Reclassified from accumulated OCI into income
 
—

 
—

 
10,844

 
10,844

Income tax benefit (expense)
 
—

 
82

 
613

 
695

Balance as of December 31, 2019
 
$
(25,831
)
 
$
(85
)
 
$
4,846

 
$
(21,070
)

 
December 31, 2018
(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 income (loss)
 
(9,768
)
 
(378
)
 
11,139

 
993

Reclassified from accumulated OCI into income
 
—

 
—

 
1,386

 
1,386

Income tax (expense) benefit
 
—

 
(148
)
 
(2,653
)
 
(2,801
)
Balance as of December 31, 2018
 
$
(22,485
)
 
$
(1,308
)
 
$
6,862

 
$
(16,931
)