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Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 30, 2015
Equity [Abstract]  
Summary of components of other comprehensive (loss) income
The following table summarizes the components of other comprehensive (loss) income for the three- and six-month periods presented:

 
THREE MONTHS ENDED JUNE 30, 2015
 
(in thousands)
 
GROSS OTHER
COMPREHENSIVE
 (LOSS) INCOME
 

 
TAX
BENEFIT
 

 
NET OTHER
COMPREHENSIVE
 (LOSS) INCOME
 

Amortization of actuarial loss on defined benefit pension plan
$
7

 
$
(3
)
 
$
4

Unrealized loss on marketable securities, available-for-sale:
 

 
 

 
 

Unrealized loss on marketable securities, available-for-sale
(150
)
 
—

 
(150
)
Less: reclassification adjustments included in net income
—

 
—

 
—

Total unrealized loss on marketable securities, available-for-sale
(150
)
 
—

 
(150
)
Other comprehensive loss
$
(143
)
 
$
(3
)
 
$
(146
)
 
 
 
 
 
 
 
SIX MONTHS ENDED JUNE 30, 2015
 
Amortization of actuarial loss on defined benefit pension plan
$
117

 
$
(45
)
 
$
72

Unrealized loss on marketable securities, available-for-sale:
 

 
 

 
 

Unrealized loss on marketable securities, available-for-sale
(169
)
 
—

 
(169
)
Less: reclassification adjustments included in net income
—

 
—

 
—

Total unrealized loss on marketable securities, available-for-sale
(169
)
 
—

 
(169
)
Other comprehensive loss
$
(52
)
 
$
(45
)
 
$
(97
)
 
 
 
 
 
 
 
THREE MONTHS ENDED JUNE 30, 2014
 
Amortization of actuarial loss on defined benefit pension plan
$
7

 
$
(3
)
 
$
4

Unrealized gain on marketable securities, available-for-sale:
 

 
 

 
 

Unrealized gain on marketable securities, available-for-sale
360

 
—

 
360

Less: reclassification adjustments for gains included in net income
(124
)
 
—

 
(124
)
Total unrealized gain on marketable securities, available-for-sale
236

 
—

 
236

Other comprehensive income
$
243

 
$
(3
)
 
$
240

 
 
 
 
 
 
 
SIX MONTHS ENDED JUNE 30, 2014
 
Amortization of actuarial loss on defined benefit pension plan
$
15

 
$
(6
)
 
$
9

Unrealized gain on marketable securities, available-for-sale:
 

 
 

 
 

Unrealized gain on marketable securities, available-for-sale
596

 
—

 
596

Less: reclassification adjustments for gains included in net income
(172
)
 
—

 
(172
)
Total unrealized gain on marketable securities, available-for-sale
424

 
—

 
424

Other comprehensive income
$
439

 
$
(6
)
 
$
433