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ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Summary of Changes in Accumulated Other Comprehensive Loss Included Within Shareholders' Equity
A summary of changes in accumulated other comprehensive loss included within shareholders’ equity is as follows (in thousands):
 
Six Months Ended
June 30, 2018
 
Six Months Ended
June 30, 2017
 
(unaudited)
 
(unaudited)
 
Foreign
Currency
Translation
Adjustments
 
Foreign
Currency
Hedge
 
Defined Benefit Pension Plans
 
Tax
Provision
 
Total
 
Foreign
Currency
Translation
Adjustments
 
Foreign
Currency
Hedge
 
Defined Benefit Pension Plans
 
Tax
Provision
 
Total
Balance, beginning of period
$
(21,366
)
 
$
3,246

 
$
(7,221
)
 
$
5,545

 
$
(19,796
)
 
$
(31,973
)
 
$
5,048

 
$
(10,518
)
 
$
8,443

 
$
(29,000
)
Other comprehensive income (loss)
(4,935
)
 
367

 
—

 
790

 
(3,778
)
 
6,556

 
(1,115
)
 
34

 
(1,230
)
 
4,245

Balance, end of period
$
(26,301
)
 
$
3,613

 
$
(7,221
)
 
$
6,335

 
$
(23,574
)
 
$
(25,417
)
 
$
3,933

 
$
(10,484
)
 
$
7,213

 
$
(24,755
)
Related Tax Effects Allocated to Each Component of Other Comprehensive Income (Loss)
The following table represents the related tax effects allocated to each component of other comprehensive income (loss) (in thousands):
 
Six Months Ended
June 30, 2018
 
Six Months Ended
June 30, 2017
 
(unaudited)
 
(unaudited)
 
Gross
Amount
 
Tax
Effect
 
Net
Amount
 
Gross
Amount
 
Tax
Effect
 
Net
Amount
Foreign currency translation adjustments
$
(4,935
)
 
$
892

 
$
(4,043
)
 
$
6,556

 
$
(1,649
)
 
$
4,907

Foreign currency hedge
367

 
(102
)
 
265

 
(1,115
)
 
426

 
(689
)
Defined benefit pension plans
—

 
—

 
—

 
34

 
(7
)
 
27

Total
$
(4,568
)
 
$
790

 
$
(3,778
)
 
$
5,475

 
$
(1,230
)
 
$
4,245