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Retirement Plans (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Contribution Plan Disclosure [Line Items]      
Company contributions made to other non-U.S. post-retirement plans $ 12,000 $ 12,000 $ 11,000
Defined Benefit Plan Disclosure [Line Items]      
Method used to amortize net gains and losses in defined benefit plan amortize cumulative actuarial gains and losses in excess of 10% of the larger of the market-related value of plan assets and the projected benefit obligation over the expected future service of active participants.    
Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Estimated future employer contributions to defined benefit plans in the next fiscal year $ 4,000    
Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Estimated future employer contributions to defined benefit plans in the next fiscal year $ 10,000    
U S Defined Contribution Plan [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Employee 401(k) contributions as % of salary, upper range limit 60.00%    
Company 401(k) matching contribution rate as % of employee contribution 100.00%    
Company 401(k) matching contribution limit as % of salary 6.00%    
Annual vesting percentage on 401(k) match 100.00%    
Annual vesting percentage on employee 401(k) contributions 100.00%    
Company contributions to defined contribution plans $ 16,000 15,000 $ 14,000
U.S. Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation 168,064 159,416  
Non-U.S. Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation $ 82,615 $ 72,618