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Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Accumulated Other Comprehensive Loss  
Schedule of Changes in Accumulated Other Comprehensive Loss
Activity for the periods indicated was as follows (in thousands):
 
 
For the Years Ended December 31,
 
 
2017
 
2016
 
2015
 
 
Foreign Currency
 
Other
 
Total
 
Foreign Currency
 
Other
 
Total
 
Foreign Currency
 
Other
 
Total
Balance as of January 1
 
$
(64,478
)
 
$
(1,336
)
 
$
(65,814
)
 
$
(67,063
)
 
$
(5,288
)
 
$
(72,351
)
 
$
(28,716
)
 
$
(5,288
)
 
$
(34,004
)
Unrealized gains (losses), net of tax
 
1,627

 
475

 
2,102

 
2,585

 
3,952

 
6,537

 
(38,347
)
 
—

 
(38,347
)
Balance as of December 31
 
$
(62,851
)
 
$
(861
)
 
$
(63,712
)
 
$
(64,478
)
 
$
(1,336
)
 
$
(65,814
)
 
$
(67,063
)
 
$
(5,288
)
 
$
(72,351
)