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Accumulated other comprehensive income (loss) (Tables)
 6 Months Ended
Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated other comprehensive loss
AOCI consists of the following balances, net of tax:
 
Foreign currency cumulative translation
 
Change in fair value of cash flow hedges
 
 
Pension and post-employment actuarial changes
 
Total
Balance, January 1, 2018
$
(47,701
)
 
$
55,366

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

 
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
)
Cumulative catch-up adjustment related to adoption of ASU 2017-12 on tax effects in AOCI (note 2(a))
—

 
186

 
 
—

 
186

OCI before reclassifications
9,250

 
10,087

 
 
(48
)
 
19,289

Amounts reclassified
—

 
3,543

 
 
3

 
3,546

Net current period OCI
$
9,250

 
$
13,630

 
 
$
(45
)
 
$
22,835

Balance, June 30, 2019
$
(64,939
)
 
$
78,149

 
 
$
(9,574
)
 
$
3,636