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Accumulated Other Comprehensive Income (Loss)
 9 Months Ended
Sep. 30, 2018
Equity [Abstract]  
Accumulated Other Comprehensive Income (Loss) ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The following table shows the changes in the components of our accumulated other comprehensive income (loss), net of tax, for the three-month period ended September 30, 2018:
 
 
 
Liability for
 
 
 
Net unrealized
 
underfunded
 
 
 
appreciation
 
employee
 
 
 
on investments
 
benefit costs(1)
 
Total
Balance as of June 30, 2018
$
(15,370
)
 
$
(43,928
)
 
$
(59,298
)
Change in accumulated other comprehensive income before reclassifications
(12,157
)
 
—

 
(12,157
)
Reclassification adjustments from accumulated other comprehensive income (loss)
392

 
1,312

 
1,704

Balance as of September 30, 2018
$
(27,135
)
 
$
(42,616
)
 
$
(69,751
)
(1) The preparation of financial statements in conformity with GAAP requires us to make various estimates and assumptions that affect the reporting of net periodic benefit cost, plan assets and plan obligations for each plan at the date of the financial statements. Actual results could differ from these estimates. One significant estimate relates to the calculation of the benefit obligation for each plan. We annually establish the discount rate, which is an estimate of the interest rate at which these benefits could be effectively settled, that is used to determine the present value of the respective plan's benefit obligations as of December 31.

The following table shows the changes in the components of our accumulated other comprehensive income (loss), net of tax, for the nine-month period ended September 30, 2018:
 
 
 
Liability for
 
 
 
Net unrealized
 
underfunded
 
 
 
appreciation
 
employee
 
 
 
on investments
 
benefit costs(1)
 
Total
Balance as of January 1, 2018
$
214,865

 
$
(46,551
)
 
$
168,314

Cumulative effect of change in accounting principle
(191,244
)
 
—

 
(191,244
)
Change in accumulated other comprehensive income before reclassifications
(51,274
)
 
—

 
(51,274
)
Reclassification adjustments from accumulated other comprehensive income (loss)
518

 
3,935

 
4,453

Balance as of September 30, 2018
$
(27,135
)
 
$
(42,616
)
 
$
(69,751
)
(1) The preparation of financial statements in conformity with GAAP requires us to make various estimates and assumptions that affect the reporting of net periodic benefit cost, plan assets and plan obligations for each plan at the date of the financial statements. Actual results could differ from these estimates. One significant estimate relates to the calculation of the benefit obligation for each plan. We annually establish the discount rate, which is an estimate of the interest rate at which these benefits could be effectively settled, that is used to determine the present value of the respective plan's benefit obligations as of December 31.