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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2014
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 for the years ended December 31, 2014, 2013 and 2012 are as follows:
 
 
Unrealized
Gain (Loss) on
Foreign Currency
Translation
 
Unrealized
Gain (Loss)
on Marketable
Securities
 
Unrealized
Gain (Loss)
on Interest
Rate Swaps
 
Accumulated
Other
Comprehensive
Income
 
 
(In thousands)
BALANCE, December 31, 2011
 
$
(7,969
)
 
$
8

 
$
(21,275
)
 
$
(29,236
)
Other comprehensive income (loss), net of tax
 
1,843

 
(8
)
 
(5,656
)
 
(3,821
)
BALANCE, December 31, 2012
 
(6,126
)
 
—

 
(26,931
)
 
(33,057
)
Other comprehensive income (loss), net of tax
 
(31,701
)
 
—

 
13,081

 
(18,620
)
BALANCE, December 31, 2013
 
(37,827
)
 
—

 
(13,850
)
 
(51,677
)
Other comprehensive income (loss), net of tax
 
(26,248
)
 
—

 
(4,059
)
 
(30,307
)
BALANCE, December 31, 2014
 
$
(64,075
)
 
$
—

 
$
(17,909
)
 
$
(81,984
)