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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2014
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Changes in accumulated other comprehensive income (loss) by component were as follows:
 
 
Benefits
Liability,
Net of Tax
 
Cumulative
Foreign
Currency
Exchange
 
Net Unrealized
Holding Gains
on Investments,
Net of Tax
 
Total
Balances at December 31, 2012
 
$
(16,351
)
 
$
5,511

 
$
—

 
$
(10,840
)
Other comprehensive income (loss) before
   reclassifications
 
7,986

 
(1,607
)
 
164

 
6,543

Amounts reclassified from accumulated other
   comprehensive loss
 
1,669

 
—

 
12

 
1,681

Net other comprehensive income (loss) for the year
 
9,655

 
(1,607
)
 
176

 
8,224

Balances at December 31, 2013
 
(6,696
)
 
3,904

 
176

 
(2,616
)
Other comprehensive (loss) income before
   reclassifications
 
(17,314
)
 
(60,128
)
 
834

 
(76,608
)
Amounts reclassified from accumulated other
   comprehensive loss
 
568

 
—

 
(777
)
 
(209
)
Net other comprehensive (loss) income for the year
 
(16,746
)
 
(60,128
)
 
57

 
(76,817
)
Balances at December 31, 2014
 
$
(23,442
)
 
$
(56,224
)
 
$
233

 
$
(79,433
)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The following table provides the details of the amounts reclassified from accumulated other comprehensive income (loss) into net income in the consolidated statements of operations:
Details about Accumulated Other Comprehensive
   Income (Loss) Components
 
Location of Reclassification
(Income (Expense)) in
Consolidated Statements
of Operations
 
Year Ended December 31,
 
2014
 
2013
Amortization of pension and other post-retirement items
 
 
 
 
 
 
Prior service costs
 
(1)
 
$
(347
)
 
$
(381
)
Net loss
 
(1)
 
(577
)
 
(2,331
)
 
 
 
 
(924
)
 
(2,712
)
 
 
Provision for income taxes
 
356

 
1,043

 
 
 
 
$
(568
)
 
$
(1,669
)
Net unrealized gains on available-for-sale investments
 
 
 
 
 
 
Realized gain (loss) on available-for-sale
   investments
 
Other income, net
 
$
1,212

 
$
(19
)
 
 
Provision for income taxes
 
(435
)
 
7

 
 
 
 
$
777

 
$
(12
)
Total reclassifications for the period
 
 
 
$
209

 
$
(1,681
)

______________________________
(1)
These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. For additional information, see Note 10.