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Benefit Plans Benefit Plans (Detail 2) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Assets for Plan Benefits, Defined Benefit Plan $ 40,493 $ 10,530
Liability, Defined Benefit Plan, Current 5,489 4,852
Liability, Defined Benefit Plan, Noncurrent 178,944 164,823
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax 314,324 320,326
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax 170,384 161,181
Pension Plan [Member] | Foreign Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Assets for Plan Benefits, Defined Benefit Plan 40,493 10,530
Liability, Defined Benefit Plan, Current 4,990 4,293
Liability, Defined Benefit Plan, Noncurrent 145,766 128,345
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax 254,870 255,855
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax 144,607 133,747
Pension Plan [Member] | Domestic Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Assets for Plan Benefits, Defined Benefit Plan 0 0
Liability, Defined Benefit Plan, Current 88 92
Liability, Defined Benefit Plan, Noncurrent 30,916 33,960
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax 61,819 69,528
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax 30,815 35,476
Other Postretirement Benefits Plan [Member] | Domestic Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Assets for Plan Benefits, Defined Benefit Plan 0 0
Liability, Defined Benefit Plan, Current 411 467
Liability, Defined Benefit Plan, Noncurrent 2,262 2,518
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax (2,365) (5,057)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax $ (5,038) $ (8,042)