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Accumulated Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
       Changes in Accumulated Other Comprehensive Income (Loss) (net of tax) by component which are presented below (in thousands):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended March 31, 2014
 
Three Months Ended March 31, 2013
 
 
 
Unrecognized Pension and Postretirement Benefit Costs
 
Net Unrealized Gains (Losses) on Marketable Securities
 
Net Losses on Cash Flow Hedges
 
Accumulated Other Comprehensive Income (Loss)
 
Unrecognized Pension and Postretirement Benefit Costs
 
Net Unrealized Gains (Losses) on Marketable Securities
 
Net Losses on Cash Flow Hedges
 
Accumulated Other Comprehensive Income (Loss)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance at beginning of period
$
(21,330
)
 
$
36,240

 
$
(12,298
)
 
$
2,612

 
$
(75,737
)
 
$
22,194

 
$
(12,541
)
 
$
(66,084
)
 
Other comprehensive income before reclassifications
12,147

 
799

 
—

 
12,946

 
—

 
5,543

 
—

 
5,543

 
Amounts reclassified from accumulated other comprehensive income (loss)
(205
)
 
(2,309
)
 
15

 
(2,499
)
 
705

 
121

 
49

 
875

Balance at end of period
$
(9,388
)
 
$
34,730

 
$
(12,283
)
 
$
13,059

 
$
(75,032
)
 
$
27,858

 
$
(12,492
)
 
$
(59,666
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Twelve Months Ended March 31, 2014
 
Twelve Months Ended March 31, 2013
 
 
 
Unrecognized Pension and Postretirement Benefit Costs
 
Net Unrealized Gains (Losses) on Marketable Securities
 
Net Losses on Cash Flow Hedges
 
Accumulated Other Comprehensive Income (Loss)
 
Unrecognized Pension and Postretirement Benefit Costs
 
Net Unrealized Gains (Losses) on Marketable Securities
 
Net Losses on Cash Flow Hedges
 
Accumulated Other Comprehensive Income (Loss)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance at beginning of period
$
(75,032
)
 
$
27,858

 
$
(12,492
)
 
$
(59,666
)
 
$
(77,246
)
 
$
20,049

 
$
(12,746
)
 
$
(69,943
)
 
Other comprehensive income (loss) before reclassifications
63,599

 
9,738

 
—

 
73,337

 
(1,264
)
 
6,695

 
—

 
5,431

 
Amounts reclassified from accumulated other comprehensive income (loss)
2,045

 
(2,866
)
 
209

 
(612
)
 
3,478

 
1,114

 
254

 
4,846

Balance at end of period
$
(9,388
)
 
$
34,730

 
$
(12,283
)
 
$
13,059

 
$
(75,032
)
 
$
27,858

 
$
(12,492
)
 
$
(59,666
)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Amounts reclassified from accumulated other comprehensive income (loss) for the three and twelve months ended March 31, 2014 and 2013 are as follows ( in thousands):

Details about Accumulated Other Comprehensive Income (Loss) Components
 
Three Months Ended March 31,
 
Twelve Months Ended March 31,
 
Affected Line Item in the Statement of Operations
 
2014
 
2013
 
2014
 
2013
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Amortization of pension and postretirement benefit costs:
 
 
 
 
 
 
 
 
 
 
 
Prior service benefit
 
$
1,459

 
1,400

 
$
5,619

 
$
5,719

 
(a)
 
Net loss
 
(1,123
)
 
(2,675
)
 
(8,920
)
 
(11,521
)
 
(a)
 
 
 
 
336

 
(1,275
)
 
(3,301
)
 
(5,802
)
 
(a)
 
Income tax effect
(131
)
 
570

 
1,256

 
2,324

 
 
 
 
 
 
205

 
(705
)
 
(2,045
)
 
(3,478
)
 
(a)
 
 
 
 
 
 
 
 
 
 
 
 
 
Marketable securities:
 
 
 
 
 
 
 
 
 
 
 
Net realized gain (loss) on sale of securities
 
2,865

 
(158
)
 
3,576

 
(934
)
 
Investment and interest income, net
 
Unrealized losses on available-for-sale securities included in pre-tax income
 
—

 
—

 
—

 
(479
)
 
Investment and interest income, net
 
 
 
 
2,865

 
(158
)
 
3,576

 
(1,413
)
 
Income before income taxes
 
 
 
 
(556
)
 
37

 
(710
)
 
299

 
Income tax expense
 
 
 
 
2,309

 
(121
)
 
2,866

 
(1,114
)
 
Net income
 
 
 
 
 
 
 
 
 
 
 
 
 
Loss on cash flow hedge:
 
 
 
 
 
 
 
 
 
 
 
Amortization of loss
 
(107
)
 
(101
)
 
(417
)
 
(392
)
 
Interest on long-term debt and revolving credit facility
 
 
 
 
(107
)
 
(101
)
 
(417
)
 
(392
)
 
Income before income taxes
 
 
 
 
92

 
52

 
208

 
138

 
Income tax expense
 
 
 
 
(15
)
 
(49
)
 
(209
)
 
(254
)
 
Net income
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total reclassifications
 
$
2,499

 
$
(875
)
 
$
612

 
$
(4,846
)
 
 
 
 
(a) These items are included in the computation of net periodic benefit cost. See Note H, Employee Benefits, for additional information.