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Accumulated other comprehensive loss
 9 Months Ended
Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated other comprehensive loss
Accumulated other comprehensive loss
The changes in accumulated other comprehensive loss, by component for the three and nine months ended September 30, 2016 and 2015 was as follows:
 
Foreign currency translation adjustment
 
Minimum pension liability
 
Cash flow hedge
 
Total
Three Months Ended September 30, 2016
 
 
 
 
 
 
 
Balance beginning of period, net of tax
$
(17,149
)
 
$
730

 
$
(1,763
)
 
$
(18,182
)
Net current period other comprehensive loss, net of tax
(1,370
)
 
(1,101
)
 
(439
)
 
(2,910
)
Balance end of period, net of tax
$
(18,519
)
 
$
(371
)
 
$
(2,202
)
 
$
(21,092
)
 
 
 
 
 
 
 
 
Three Months Ended September 30, 2015
 
 
 
 
 
 
 
Balance beginning of period, net of tax
$
(8,374
)
 
$
(53
)
 
$
(639
)
 
$
(9,066
)
Net current period other comprehensive loss, net of tax
(1,850
)
 
(28
)
 
75

 
(1,803
)
Balance end of period, net of tax
$
(10,224
)
 
$
(81
)
 
$
(564
)
 
$
(10,869
)
 
 
 
 
 
 
 
 
Nine Months Ended September 30, 2016
 
 
 
 
 
 
 
Balance beginning of period, net of tax
$
(11,834
)
 
$
334

 
$
(1,069
)
 
$
(12,569
)
Net current period other comprehensive loss, net of tax
(6,685
)
 
(705
)
 
(1,133
)
 
(8,523
)
Balance end of period, net of tax
$
(18,519
)
 
$
(371
)
 
$
(2,202
)
 
$
(21,092
)
 
 
 
 
 
 
 
 
Nine Months Ended September 30, 2015
 
 
 
 
 
 
 
Balance beginning of period, net of tax
$
(8,118
)
 
$
(210
)
 
$
(228
)
 
$
(8,556
)
Net current period other comprehensive loss, net of tax
(2,106
)
 
129

 
(336
)
 
(2,313
)
Balance end of period, net of tax
$
(10,224
)
 
$
(81
)
 
$
(564
)
 
$
(10,869
)