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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2017
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table summarizes the changes in AOCI, net of taxes by component for the three months ended March 31, 2017 (in thousands):
 
Pension and Other Post-Retirement Benefit Items
 
Marketable Securities
 
Cash Flow Hedging Instruments
 
Foreign Currency Translation Adjustments
 
Total
Balance at December 31, 2016
$
(64,883
)
 
$
3,075

 
$
—

 
$
(19,974
)
 
$
(81,782
)
Other comprehensive income (loss) before reclassifications
—

 
(94
)
 
(2,088
)
 
3,169

 
987

Amounts reclassified from AOCI
(44
)
 
(3,042
)
 
788

 
8,954

 
6,656

Balance at March 31, 2017
$
(64,927
)
 
$
(61
)
 
$
(1,300
)
 
$
(7,851
)
 
$
(74,139
)