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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Changes in the Balances of Each Component of Accumulated Other Comprehensive Income
Changes in the balances of each component of accumulated other comprehensive income (loss) for the years ended December 31, 2018, 2017 and 2016 are as follows (in thousands):
 
 
Accumulated income
(loss) on
foreign currency
translation
 
Accumulated income
(loss)
on interest
rate swaps
 
Total
BALANCE, December 31, 2015
 
$
(118,532
)
 
$
(19,452
)
 
$
(137,984
)
Other comprehensive income (loss), net of tax
 
(19,081
)
 
10,121

 
(8,960
)
BALANCE, December 31, 2016
 
(137,613
)
 
(9,331
)
 
(146,944
)
Other comprehensive income (loss), net of tax
 
15,061

 
8,657

 
23,718

BALANCE, December 31, 2017
 
(122,552
)
 
(674
)
 
(123,226
)
Other comprehensive income (loss), net of tax
 
(24,156
)
 
9,760

 
(14,396
)
Tax effects reclassified from accumulated other comprehensive income (loss)
 
—

 
(150
)
 
(150
)
BALANCE, December 31, 2018
 
$
(146,708
)
 
$
8,936

 
$
(137,772
)