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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Loss
AOCL was comprised of the following for the three years ended December 31:
 
2017
 
2016
 
2015
Unrecognized components of employee benefit plans, net of tax:
 
 
 
 
 
Balance, beginning of year
$
(110,080
)
 
$
(109,620
)
 
$
(103,444
)
Other comprehensive gain (loss) before reclassifications
26,050

 
(12,917
)
 
(24,191
)
Income tax on other comprehensive loss
(5,731
)
 
—

 
—

Reclassifications to earnings: (a)
 
 
 
 
 
Amortization of losses
11,984

 
11,581

 
14,110

Amortization of prior service costs
763

 
775

 
767

Amortization of negative plan amendment
(153
)
 
(153
)
 
(175
)
Income tax on reclassifications
(4,471
)
 
254

 
3,313

Net comprehensive gain (loss) on employee benefit plans, net of tax
28,442

 
(460
)
 
(6,176
)
Balance, end of year
(81,638
)
 
(110,080
)
 
(109,620
)
 
 
 
 
 
 
Unrealized gain on derivative instruments, net of tax:
 
 
 
 
 
Balance, beginning of year
—

 
—

 
—

Other comprehensive income before reclassifications
749

 
—

 
—

Income tax on other comprehensive income
(130
)
 
—

 
—

Net comprehensive gain on derivative instruments, net of tax
619

 
—

 
—

Balance, end of year (b)
619

 
—

 
—

 
 
 
 
 
 
Foreign currency translation adjustments:
 
 
 
 
 
Balance, beginning of year
—

 
—

 
—

Foreign currency translation adjustment
4,868

 
—

 
—

Balance, end of year
4,868

 
—

 
—

 
 
 
 
 
 
Accumulated other comprehensive loss, end of year
$
(76,151
)
 
$
(110,080
)
 
$
(109,620
)
(a)
The AOCL components for defined benefit pension and post-retirement plans are included in the computation of net periodic pension cost. See Note 16 — Employee Benefit Plans for additional information.
(b)
Reclassifications of interest rate contracts are recorded in interest expense, and reclassifications of foreign currency exchange contracts are recorded in other operating income. Additional details about the reclassifications related to derivative instruments is included in Note 10 —Derivative Instruments. There were no reclassifications to earnings for derivative instruments during the year ended December 31, 2017.