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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Schedule of 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
)
Reclassification out of Accumulated Other Comprehensive Income
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.