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Accumulated other comprehensive income (loss)
 12 Months Ended
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated other comprehensive income (loss)
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, 2016
$
261,357

 
$
39,329

 
$
(72
)
 
$
(13,877
)
 
$
286,737

OCI (loss) before reclassifications
(61,029
)
 
34,308

 
213

 
2,856

 
(23,652
)
Amounts reclassified
—

 
(7,554
)
 
—

 
(604
)
 
(8,158
)
Net current period OCI
(61,029
)
 
26,754

 
213

 
2,252

 
(31,810
)
Balance, December 31, 2016
$
200,328

 
$
66,083

 
$
141

 
$
(11,625
)
 
$
254,927

OCI before reclassifications
(200,400
)
 
8,714

 
—

 
838

 
(190,848
)
Amounts reclassified
—

 
(6,805
)
 
(141
)
—

(313
)
 
(7,259
)
Net current period OCI
$
(200,400
)
 
$
1,909

 
$
(141
)
 
$
525

 
$
(198,107
)
Balance, December 31, 2017
$
(72
)
 
$
67,992

 
$
—

 
$
(11,100
)
 
$
56,820


Amounts reclassified from AOCI for unrealized gain (loss) on cash flow hedges affected revenue from non-regulated energy sales while those for pension and post-employment actuarial changes affected administrative expenses.