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Accumulated Other Comprehensive Income (Loss) (Reclassification) (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]      
Other income (expense), net $ 3,379 $ (1,788) $ (8,492)
Income tax expense (52,466) (33,997) (19,853)
Net income 80,459 48,283 $ 46,320
Unrealized gain (loss) on derivative instruments      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification from AOCI, net of tax 0 [1] 11 [2]  
Accumulated defined benefit plans adjustment, Net gain (loss) attributable to parent      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Income before income taxes 154 [3] 246 [4]  
Funded status of pension plans and other postretirement benefits      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification from AOCI, tax (55) (86)  
Reclassification from AOCI, net of tax 99 [5] 160 [6]  
Amounts reclassified from accumulated other comprehensive income (loss) for the period ended December 31, 2013 | Unrealized gain (loss) on derivative instruments      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Other income (expense), net 41    
Other income (expense), net   16  
Income tax expense (15) (5)  
Net income $ 26 $ 11  
[1] Net of taxes of $15 and $0 for the years ended December 31, 2017 and December 31, 2016, respectively.
[2] Net of taxes of $0 and $5 for the years ended December 31, 2016 and December 31, 2015, respectively.
[3] These accumulated other comprehensive income components are included in the computation of net periodic pension cost. See Note 10, “Pension Benefits and Retirement Health and Life Insurance Benefits” for additional details.
[4] These accumulated other comprehensive income components are included in the computation of net periodic pension cost. See Note 10, “Pension Benefits and Other Postretirement Benefit Plans” for additional details.
[5] Net of taxes of $9,563 and $9,160 for the years ended December 31, 2017 and December 31, 2016, respectively.
[6] Net of taxes of $9,160 and $9,879 for the years ended December 31, 2016 and December 31, 2015, respectively.