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Employee Benefit Plans (Details Textual) (USD $)
1 Months Ended 12 Months Ended
Jan. 31, 2012
Jul. 31, 2011
Oct. 31, 2010
Dec. 31, 2012
Employees
Dec. 31, 2011
Employees
Employee Benefit Plans (Textual) [Abstract]          
Contribution\charges to the Company plans       $ 4,107,000 $ 3,979,000
Employee Benefit Plans (Additional Textual) [Abstract]          
Pension benefit calculation description       highest five-year average compensation within ten years before retirement  
Highest average compensation period       5 years  
Unrecognized actuarial loss included in accumulated comprehensive income       19,073,000  
Actuarial losses to be recognized in net periodic benefit costs       847,000  
Employers matching contribution, percentage 3.00% 2.00% 1.00%    
Number of employees participating in medical plan       702 715
The Defined Contribution Plan [Member]
         
Employee Benefit Plans (Textual) [Abstract]          
Contribution\charges to the Company plans       908,000 446,000
Non-US Employees Defined Benefit Plan [Member]
         
Employee Benefit Plans (Textual) [Abstract]          
Expenses related to defined benefit and contribution plan during year       200,000 262,000
Equity securities [Member]
         
Employee Benefit Plans (Textual) [Abstract]          
Target plan asset allocations range, minimum       0.00%  
Target plan asset allocations range, maximum       55.00%  
Fixed income securities [Member]
         
Employee Benefit Plans (Textual) [Abstract]          
Target plan asset allocations range, minimum       35.00%  
Target plan asset allocations range, maximum       100.00%  
Non Traditional Securities [Member]
         
Employee Benefit Plans (Textual) [Abstract]          
Target plan asset allocations range, minimum       0.00%  
Target plan asset allocations range, maximum       10.00%  
Maximum [Member]
         
Employee Benefit Plans (Textual) [Abstract]          
Maximum period allocated for calculating average compensation       10 years  
Estimated contributions expected to be paid to plans during 2013       800,000  
Minimum [Member]
         
Employee Benefit Plans (Textual) [Abstract]          
Estimated contributions expected to be paid to plans during 2013       $ 600,000