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Accumulated other comprehensive loss
 12 Months Ended
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Accumulated other comprehensive loss
Accumulated other comprehensive (loss) income
The changes in accumulated other comprehensive (loss) income, by component for the years ended December 31, 2017, 2016 and 2015 are as follows:
 
Year Ended December 31, 2017
 
Foreign currency translation adjustment
 
Minimum pension liability
 
Cash flow hedge
 
Total
Balance, net of tax, beginning of year
$
(22,274
)
 
$
(150
)
 
$
(792
)
 
$
(23,216
)
Other comprehensive income (loss), net of tax
4,057

 
2,869

 
(6,352
)
 
574

Amounts reclassified from accumulated other comprehensive loss
—

 
—

 
450

 
450

Balance, net of tax, end of year
$
(18,217
)
 
$
2,719

 
$
(6,694
)
 
$
(22,192
)
 
 
 
 
 
 
 
 
 
Year Ended December 31, 2016
 
Foreign currency translation adjustment
 
Minimum pension liability
 
Cash flow hedge
 
Total
Balance, net of tax, beginning of year
$
(11,834
)
 
$
334

 
$
(1,069
)
 
$
(12,569
)
Other comprehensive (loss) income, net of tax
(10,440
)
 
(484
)
 
277

 
(10,647
)
Balance, net of tax, end of year
$
(22,274
)
 
$
(150
)
 
$
(792
)
 
$
(23,216
)
 
 
 
 
 
 
 
 
 
Year Ended December 31, 2015
 
Foreign currency translation adjustment
 
Minimum pension liability
 
Cash flow hedge
 
Total
Balance, net of tax, beginning of year
$
(8,118
)
 
$
(210
)
 
$
(228
)
 
$
(8,556
)
Other comprehensive (loss) income, net of tax
(3,716
)
 
544

 
(841
)
 
(4,013
)
Balance, net of tax, end of year
$
(11,834
)
 
$
334

 
$
(1,069
)
 
$
(12,569
)