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Accumulated Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Schedule of Accumulated Other Comprehensive Income (Loss)
              Upon adoption of ASU 2016-01, Financial Instruments-Overall, the Company recorded, on January 1, 2018, a cumulative effect adjustment, net of income taxes, to increase retained earnings by $41.0 million with an offset to AOCI. Changes in Accumulated Other Comprehensive Income (Loss) (net of tax) by component are presented below (in thousands):
 
 
 
Three Months Ended March 31, 2018
 
Three Months Ended March 31, 2017
 
 
 
Unrecognized Pension and Post-retirement Benefit Costs
 
Net Unrealized Gains (Losses) on Debt Securities
 
Net Losses on Cash Flow Hedges
 
Accumulated Other Comprehensive Income (Loss)
 
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 beginning of period as previously reported
$
(17,790
)
 
$
40,190

 
$
(11,342
)
 
$
11,058

 
$
(23,928
)
 
$
28,463

 
$
(11,651
)
 
$
(7,116
)
 
Cumulative effect adjustment
—

 
(41,028
)
 
—

 
(41,028
)
 
—

 
—

 
—

 
—

 
Other comprehensive income before reclassifications
—

 
(2,159
)
 
—

 
(2,159
)
 
—

 
6,165

 
—

 
6,165

 
Amounts reclassified from accumulated other comprehensive income (loss)
(685
)
 
404

 
89

 
(192
)
 
(529
)
 
(1,756
)
 
52

 
(2,233
)
Balance at end of period
$
(18,475
)
 
$
(2,593
)
 
$
(11,253
)
 
$
(32,321
)
 
$
(24,457
)
 
$
32,872

 
$
(11,599
)
 
$
(3,184
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Twelve Months Ended March 31, 2018
 
Twelve Months Ended March 31, 2017
 
 
 
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)
 
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 beginning of period as previously reported
$
(24,457
)
 
$
32,872

 
$
(11,599
)
 
$
(3,184
)
 
$
(30,256
)
 
$
28,394

 
$
(11,770
)
 
$
(13,632
)
 
Cumulative effect adjustment
—

 
(41,028
)
 
—

 
(41,028
)
 
—

 
—

 
—

 
—

 
Other comprehensive income before reclassifications
7,951

 
11,927

 
—

 
19,878

 
7,363

 
11,327

 
—

 
18,690

 
Amounts reclassified from accumulated other comprehensive income (loss)
(1,969
)
 
(6,364
)
 
346

 
(7,987
)
 
(1,564
)
 
(6,849
)
 
171

 
(8,242
)
Balance at end of period
$
(18,475
)
 
$
(2,593
)
 
$
(11,253
)
 
$
(32,321
)
 
$
(24,457
)
 
$
32,872

 
$
(11,599
)
 
$
(3,184
)
Reclassification out of Accumulated Other Comprehensive Income
Amounts reclassified from Accumulated Other Comprehensive Income (Loss) for the three and twelve months ended March 31, 2018 and 2017 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 Statements of Operations
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Amortization of pension and post-retirement benefit costs:
 
 
 
 
 
 
 
 
 
 
 
Prior service benefit
 
$
2,416

 
$
2,416

 
$
9,657

 
$
8,157

 
Miscellaneous non-operating income
 
Net loss
 
(1,575
)
 
(1,694
)
 
(6,657
)
 
(5,436
)
 
Miscellaneous non-operating deductions
 
 
 
 
841

 
722

 
3,000

 
2,721

 
Income (loss) before income taxes
 
Income tax effect
 
(156
)
 
(193
)
 
(1,031
)
 
(1,157
)
 
Income tax (benefit) expense
 
 
 
 
685

 
529

 
1,969

 
1,564

 
Net income (loss)
 
 
 
 
 
 
 
 
 
 
 
 
 
Marketable securities:
 
 
 
 
 
 
 
 
 
 
 
Net realized gain (loss) on sale of securities
 
(518
)
 
2,191

 
7,917

 
8,443

 
Investment and interest income, net
 
 
 
 
(518
)
 
2,191

 
7,917

 
8,443

 
Income (loss) before income taxes
 
Income tax effect
 
114

 
(435
)
 
(1,553
)
 
(1,594
)
 
Income tax (benefit) expense
 
 
 
 
(404
)
 
1,756

 
6,364

 
6,849

 
Net income (loss)
 
 
 
 
 
 
 
 
 
 
 
 
 
Loss on cash flow hedge:
 
 
 
 
 
 
 
 
 
 
 
Amortization of loss
 
(139
)
 
(130
)
 
(541
)
 
(506
)
 
Interest on long-term debt and revolving credit facility
 
 
 
 
(139
)
 
(130
)
 
(541
)
 
(506
)
 
Income (loss) before income taxes
 
Income tax effect
 
50

 
78

 
195

 
335

 
Income tax (benefit) expense
 
 
 
 
(89
)
 
(52
)
 
(346
)
 
(171
)
 
Net income (loss)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total reclassifications
 
$
192

 
$
2,233

 
$
7,987

 
$
8,242