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Accumulated Other Comprehensive Income (Notes)
 12 Months Ended
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Comprehensive Income (Loss) Note
Accumulated Other Comprehensive Income (Loss)

       Changes in Accumulated Other Comprehensive Income (Loss) (net of tax) by component are presented below (in thousands):
 
 
 
Unrecognized Pension and Post-retirement Benefit Costs
 
Net Unrealized Gains (Losses) on Marketable Securities
 
Net Losses on Cash Flow Hedges
 
Accumulated Other Comprehensive Income (Loss)
 
 
 
 
 
 
 
 
 
 
Balance at December 31, 2013
$
(21,330
)
 
$
36,240

 
$
(12,298
)
 
$
2,612

 
Other comprehensive income (loss) before reclassifications
(12,628
)
 
8,694

 
—

 
(3,934
)
 
Amounts reclassified from accumulated other comprehensive income (loss)
(926
)
 
(5,977
)
 
224

 
(6,679
)
Balance at December 31, 2014
(34,884
)
 
38,957

 
(12,074
)
 
(8,001
)
 
Other comprehensive income (loss) before reclassifications
3,777

 
(2,255
)
 
—

 
1,522

 
Amounts reclassified from accumulated other comprehensive income (loss)
1,238

 
(8,937
)
 
264

 
(7,435
)
Balance at December 31, 2015
(29,869
)
 
27,765

 
(11,810
)
 
(13,914
)
 
Other comprehensive income before reclassifications
7,363

 
6,904

 
—

 
14,267

 
Amounts reclassified from accumulated other comprehensive income (loss)
(1,422
)
 
(6,206
)
 
159

 
(7,469
)
Balance at December 31, 2016
$
(23,928
)
 
$
28,463

 
$
(11,651
)
 
$
(7,116
)


Amounts reclassified from Accumulated Other Comprehensive Income (Loss) for the twelve months ended December 31, 2016, 2015 and 2014 are as follows (in thousands):
Details about Accumulated Other Comprehensive Income (Loss) Components
 
2016
 
2015
 
2014
Affected Line Item in the Statements of Operations
 
 
 
 
 
 
 
 
 
 
Amortization of pension and post-retirement benefit costs:
 
 
 
 
 
 
 
 
Prior service benefit
 
$
7,407

 
$
6,574

 
$
7,659

(a)
 
Net loss
 
(4,965
)
 
(8,622
)
 
(6,182
)
(a)
 
 
 
 
2,442

 
(2,048
)
 
1,477

(a)
 
Income tax effect
 
(1,020
)
 
810

 
(551
)
Income tax expense
 
 
 
 
1,422

 
(1,238
)
 
926

Net income
 
 
 
 
 
 
 
 
 
 
Marketable securities:
 
 
 
 
 
 
 
 
Net realized gain on sale of securities
 
7,640

 
11,114

 
7,350

Investment and interest income, net
 
 
 
 
7,640

 
11,114

 
7,350

Income before income taxes
 
Income tax effect
 
(1,434
)
 
(2,177
)
 
(1,373
)
Income tax expense
 
 
 
 
6,206

 
8,937

 
5,977

Net income
 
 
 
 
 
 
 
 
 
 
Loss on cash flow hedge:
 
 
 
 
 
 
 
 
Amortization of loss
 
(498
)
 
(467
)
 
(438
)
Interest on long-term debt and revolving credit facility
 
 
 
 
(498
)
 
(467
)
 
(438
)
Income before income taxes
 
Income tax effect
 
339

 
203

 
214

Income tax expense
 
 
 
 
(159
)
 
(264
)
 
(224
)
Net income
 
 
 
 
 
 
 
 
 
 
 
Total reclassifications
 
$
7,469

 
$
7,435

 
$
6,679

 
 
 
(a) These items are included in the computation of net periodic benefit cost. See Part II, Item 8, Financial Statements and Supplementary Data, Note M for additional information.