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Pension Plans (Details Textual) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pension Plans (Textual) [Abstract]        
Non-cash curtailment gain $ 6,300,000 $ 6,275,000 $ 0  
Pension liability   6,300,000    
Estimated net loss for the PLP-USA pension plan   500,000    
Long term asset rate return   8.00% 8.00% 8.00%
Contribution to pension plan 2,600,000 2,600,000    
Expense for contribution plan   5,700,000 4,800,000 4,600,000
Weighted average of one year treasury bill   1.00%    
Interest rate for the supplemental profit sharing plan   1.12% 1.29%  
Expense for the supplemental profit sharing plan 400,000 400,000 300,000 300,000
Supplemental profit sharing plan unfunded status $ 2,600,000 $ 2,600,000 $ 2,200,000