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Employee Benefit Plans (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]      
Noncurrent liabilities $ 213,578 $ 259,367  
Pension Plan      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rates 2.80% 3.10% 3.90%
Expected long-term rates of return on plan assets 6.00% 6.20% 6.70%
Expected long-term rates of return on plan assets for next year (as a percent) 5.90%    
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount rates 3.20% 2.80%  
U.S. Plans | Pension Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year $ 314,861 $ 305,652  
Service cost 42 43 $ 102
Interest cost 9,562 9,878 10,165
Plan participants' contributions 0 0  
Amendments 0 0  
Actuarial loss (21,474) 14,459  
Settlements/curtailments 0 0  
Benefits paid (16,964) (15,171)  
Effect of foreign currency 0 0  
Benefit obligation at end of year 286,027 314,861 305,652
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 229,941 205,271  
Actual return on plan assets (17,883) 33,942  
Employer contributions 10,294 5,899  
Plan participants' contributions 0 0  
Settlements/curtailments 0 0  
Benefits paid (16,964) (15,171)  
Effect of foreign currency 0 0  
Fair value of plan assets at end of year 205,388 229,941 $ 205,271
Funded status at end of year (80,639) (84,920)  
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]      
Noncurrent assets 1,953 1,860  
Current liabilities 1,954 2,237  
Noncurrent liabilities 80,638 84,543  
Total accumulated other comprehensive loss before tax 149,326 146,341  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]      
Net actuarial loss 149,326 146,340  
Prior service cost 0 1  
Total accumulated other comprehensive loss before tax 149,326 $ 146,341  
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]      
Net actuarial loss 5,621    
Prior service cost 0    
Total 5,621    
Estimate of expected contributions in next fiscal year 9,100    
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]      
2019 20,000    
2020 19,500    
2021 19,300    
2022 19,400    
2023 19,300    
2024-2028 $ 94,100    
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rates 3.50% 4.00% 4.20%
Expected long-term rates of return on plan assets 7.30% 7.30% 7.30%
Expected long-term rates of return on plan assets for next year (as a percent) 7.30%    
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount rates 4.20% 3.50%  
Highest yield U.S. dollar-denominated, AA-graded corporate bonds excluded from yield curve universe (as a percent) 10.00%    
Lowest yield U.S. dollar-denominated, AA-graded corporate bonds excluded from yield curve universe (as a percent) 10.00%    
International Plans | Pension Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year $ 1,015,586 $ 952,360  
Service cost 1,669 1,724 $ 1,585
Interest cost 21,589 21,459 26,822
Plan participants' contributions 49 61  
Amendments 11,238 (4,459)  
Actuarial loss (78,658) (3,613)  
Settlements/curtailments (313) (3,362)  
Benefits paid (37,721) (40,379)  
Effect of foreign currency (58,760) 91,795  
Benefit obligation at end of year 874,679 1,015,586 952,360
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 842,717 732,743  
Actual return on plan assets (30,004) 67,136  
Employer contributions 18,415 18,187  
Plan participants' contributions 49 61  
Settlements/curtailments (313) (3,241)  
Benefits paid (37,570) (39,800)  
Effect of foreign currency (48,756) 67,631  
Fair value of plan assets at end of year 744,538 842,717 $ 732,743
Funded status at end of year (130,141) (172,869)  
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]      
Noncurrent assets 2,379 1,820  
Current liabilities 643 625  
Noncurrent liabilities 131,876 174,064  
Total accumulated other comprehensive loss before tax 391,849 427,127  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]      
Net actuarial loss 384,666 430,377  
Prior service cost 7,183 (3,250)  
Total accumulated other comprehensive loss before tax 391,849 $ 427,127  
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]      
Net actuarial loss 14,480    
Prior service cost 324    
Total 14,804    
Estimate of expected contributions in next fiscal year 20,400    
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]      
2019 38,500    
2020 39,400    
2021 41,000    
2022 41,400    
2023 42,500    
2024-2028 $ 228,200    
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rates 2.60% 2.80% 3.80%
Expected long-term rates of return on plan assets 5.60% 5.90% 6.50%
Expected long-term rates of return on plan assets for next year (as a percent) 5.50%    
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount rates 2.90% 2.60%