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Benefit Plans and Other Postretirement Benefits (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Components of net periodic benefit cost:        
Contributions to U.S defined contribution plans by the Company, maximum percentage of eligible compensation     5.00%  
Matching contributions to U.S defined contribution plans by the Company     $ 1,800 $ 1,600
Pension Benefits
       
Components of net periodic benefit cost:        
Service cost 2,049 2,103 4,095 4,215
Interest cost 6,035 5,107 12,052 10,314
Expected return on plan assets (7,123) (6,071) (14,255) (12,274)
Amortization of transition obligation (25) (27) (49) (54)
Amortization of prior service cost 673 485 1,346 980
Amortization of net actuarial losses 4,022 5,897 8,035 11,802
Net pension expense 5,631 7,494 11,224 14,983
U.S. plans, Pension Benefits
       
Components of net periodic benefit cost:        
Employer contributions 4,000   4,000  
Estimated cash contribution to the Plans in 2014 based on current actuarial calculations     20,000  
Other Postretirement Benefits
       
Components of net periodic benefit cost:        
Service cost 28 40 55 80
Interest cost 123 127 245 255
Amortization of net actuarial losses 104 193 210 385
Net pension expense $ 255 $ 360 $ 510 $ 720