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Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Accumulated other comprehensive loss, net of tax $ (43,983) $ (51,753)  
Net current period other comprehensive income ending balance 7,770 3,795 $ 15,315
Amortization of actuarial loss (9,200) (600)  
Amortization of actuarial loss included in net periodic cost, before tax 3,300 3,900  
Amortization of prior service (cost) credit 1,500 1,700  
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax 3,100 1,200  
Defined Benefit Plan, Settlements, Benefit Obligation   3,500  
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, Tax 0 1,366 0
Defined Benefit Pension Plan Adjustments      
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Accumulated other comprehensive loss, net of tax (43,983) (51,753) (55,548)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax [1] 6,745 2,495  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 1,025 1,300  
Net current period other comprehensive income ending balance [2] 7,770 3,795  
Pension Plan [Member]      
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Amortization of actuarial loss 9,874 11,463 12,619
Amortization of prior service (cost) credit (8) (22) (73)
Defined Benefit Plan, Settlements, Benefit Obligation $ 0 $ 3,482 $ 0
[1] Included in "Other comprehensive income before reclassifications" above for the twelve months ended December 31, 2016 is settlement expense of $3.5 million associated with the remeasurement of our salaried pension plan, which is discussed further in Note 13, “Savings, Pension and Other Postretirement Employee Benefit Plans.” The settlement expense is net of tax totaling $1.4 million.
[2] 1For the year ended December 31, 2017, net periodic costs associated with our pension and other postretirement employee benefit, or OPEB, plans included in other comprehensive loss and reclassified from accumulated other comprehensive loss, or AOCL, included $9.2 million of net gain on plan assets, $3.3 million of actuarial loss amortization, and $1.5 million of prior service credit amortization, less total tax of $3.1 million. For the year ended December 31, 2016, net periodic costs associated with our pension and OPEB plans included in other comprehensive income and reclassified from AOCL included $0.6 million of net gain on plan assets, $3.9 million of actuarial loss amortization, and $1.7 million of prior service credit amortization, less total tax of $1.2 million. These accumulated other comprehensive loss components are included in the computation of net periodic pension and OPEB costs in Note 13, “Savings, Pension and Other Postretirement Employee Benefit Plans.”