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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Net periodic pension cost, U.S. Plans $ 8,208 $ 7,660 $ 21,379
Net periodic pension cost, International Plans 13,107 19,054 32,242
U.S. Plans      
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Defined contribution plans $ 3,921 4,704 4,945
U.S. Plans | Maximum      
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]      
Employer matching contribution (as a percent) 4.00%    
International Plans      
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]      
Additional contribution towards insurance and administrative costs (as a percent) 2.00%    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Defined contribution plans $ 6,765 8,033 11,139
International Plans | Maximum      
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]      
Employer matching contribution (as a percent) 6.00%    
U.S. Plans      
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Service cost $ 2,889 2,233 2,565
Interest cost 12,357 12,868 11,767
Expected return on plan assets (16,812) (16,786) (15,642)
Recognized prior service costs 81 90 248
Recognized losses 4,919 3,352 5,052
Settlement/curtailment loss (gain) 0 0 0
Defined benefit plans pension cost 3,434 1,757 3,990
International Plans      
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Service cost 1,648 1,610 3,457
Interest cost 36,282 43,230 42,707
Expected return on plan assets (50,091) (49,927) (46,920)
Recognized prior service costs 188 184 335
Recognized losses 16,875 14,102 16,447
Settlement/curtailment loss (gain) (23) 60 (372)
Defined benefit plans pension cost 4,879 9,259 15,654
International Plans      
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Multiemployer plans 1,463 1,762 5,449
U.S. Plans      
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Multiemployer plans $ 853 $ 1,199 $ 12,444