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Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 30, 2013
Stockholders' Equity Note [Abstract]  
Summary of Changes in Accumulated Other Comprehensive Loss for Pension Plan Items
Following is a summary of the changes in Accumulated other comprehensive loss during the three and six months ended June 30, 2013:
 
Defined Benefit Pension Items
 
Unrealized Gains and Losses on Available-for-Sale Securities
 
Total
Accumulated other comprehensive loss at March 31, 2013
$
(8,555
)
 
$
—

 
$
(8,555
)
Other comprehensive income before reclassifications
2,013

 
(891
)
 
1,122

Amounts reclassified from accumulated other comprehensive loss:
 
 
 
 
 
Amortization of loss included in net periodic cost
101

 
—

 
101

Settlement cost included in net periodic cost
394

 
—

 
394

Net current period other comprehensive income (loss)
2,508

 
(891
)
 
1,617

Accumulated other comprehensive loss at June 30, 2013
$
(6,047
)
 
$
(891
)
 
$
(6,938
)
 
 
 
 
 
 
Accumulated other comprehensive loss at December 31, 2012
$
(8,652
)
 
$
—

 
$
(8,652
)
Other comprehensive income before reclassifications
2,013

 
(891
)
 
1,122

Amounts reclassified from accumulated other comprehensive loss:
 
 
 
 
 
Amortization of loss included in net periodic cost
198

 
—

 
198

Settlement cost included in net periodic cost
394

 
—

 
394

Net current period other comprehensive income (loss)
2,605

 
(891
)
 
1,714

Accumulated other comprehensive loss at June 30, 2013
$
(6,047
)
 
$
(891
)
 
$
(6,938
)