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Accumulated other comprehensive income (loss) (Tables)
 12 Months Ended
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated other comprehensive income (loss)
AOCI consists of the following balances, net of tax:
    
 
Foreign currency cumulative translation
 
Unrealized gain on cash flow hedges
 
Net change on available-for-sale investments
 
Pension and post-employment actuarial changes
 
Total
Balance, January 1, 2017
$
(25,921
)
 
$
53,740

 
$
65

 
$
(10,833
)
 
$
17,051

OCI (loss) before reclassifications
(21,780
)
 
8,004

 
—

 
600

 
(13,176
)
Amounts reclassified
—

 
(6,378
)
 
(65
)
 
(224
)
 
(6,667
)
Net current period OCI
(21,780
)
 
1,626

 
(65
)
 
376

 
(19,843
)
Balance, December 31, 2017
$
(47,701
)
 
$
55,366

 
$
—

 
$
(10,457
)
 
$
(2,792
)
Cumulative catch-up adjustment related to adoption of ASU 2018-02 on tax effects in AOCI (note 2(a))
—

 
11,657

 
—

 
(1,032
)
 
10,625

OCI before reclassifications
(26,488
)
 
1,567

 
—

 
2,046

 
(22,875
)
Amounts reclassified
—

 
(4,257
)
 
—

—

(86
)
 
(4,343
)
Net current period OCI
$
(26,488
)
 
$
(2,690
)
 
$
—

 
$
1,960

 
$
(27,218
)
Balance, December 31, 2018
$
(74,189
)
 
$
64,333

 
$
—

 
$
(9,529
)
 
$
(19,385
)