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Postretirement Benefit Plans (Details Textual) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Model
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
U.S. [Member]
Dec. 31, 2012
United Kingdom [Member]
Dec. 31, 2012
Europe [Member]
Dec. 31, 2012
Other Regions [Member]
Dec. 31, 2012
Equities [Member]
Dec. 31, 2012
Real Estate [Member]
Dec. 31, 2012
Commodities [Member]
Dec. 31, 2012
U.S. Treasury bond [Member]
Dec. 31, 2012
U.S. and international equities [Member]
Dec. 31, 2012
U.S Plans [Member]
Feb. 21, 2012
U.S Plans [Member]
Feb. 22, 2011
U.S Plans [Member]
Dec. 31, 2012
U.S Plans [Member]
Debt Securities [Member]
Dec. 31, 2012
U.S Plans [Member]
Employer Securities [Member]
Dec. 31, 2012
U.K Plan [Member]
Dec. 31, 2012
Retirement Savings Plans [Member]
Dec. 31, 2011
Retirement Savings Plans [Member]
Dec. 31, 2010
Retirement Savings Plans [Member]
Dec. 31, 2012
Profit Sharing Plan [Member]
Dec. 31, 2011
Profit Sharing Plan [Member]
Dec. 31, 2010
Profit Sharing Plan [Member]
Dec. 31, 2012
Statutory Plans [Member]
Dec. 31, 2011
Statutory Plans [Member]
Dec. 31, 2010
Statutory Plans [Member]
Postretirement benefit plan (Textual) [Abstract]                                                      
Percentage of target allocation for equities               40.00% 4.50% 2.50%           31.00% 22.00%                    
Percentage of fixed income assets in debt securities                         20.00%                            
Common shares sold to the Company's ESOP trust                           27,331 32,942                        
Percentage of equities within the pooled pension fund       36.00% 25.00% 20.00% 19.00%                                        
Period for yield of zero coupon U.S. Treasury bond                     5 years                                
Expected long-term rate of return on assets 7.75%               7.10% 6.90%   8.90%                              
Company's expected contribution to qualified plan                         $ 0         $ 986,000                  
Expected payment related to Nonqualified plan                         174,000                            
Defined contribution plan expense 10,046,000 8,802,000 9,370,000                               4,284,000 4,033,000 4,309,000 5,762,000 4,769,000 5,061,000 711,000 159,000 800,000
Postretirement Benefit Plan (Additional Textual) [Abstract]                                                      
Period of smoothing of assets gain or losses 5 years                                                    
Assets gains or losses added for prior year 80.00%                                                    
Assets gains or losses added for second preceding year 60.00%                                                    
Assets gains or losses added for third preceding year 40.00%                                                    
Assets gains or losses added for fourth preceding year 20.00%                                                    
Expected return for fixed income 5.50%                                                    
Number of statistical models for return 3                                                    
Percentage of premium estimated return for equities and properties to risk free rate 3.00%                                                    
Percentage of long term return in cash 4.00%                                                    
Balance of the trust assets 1,572,000 1,310,000                                                  
supplemental plan liability balances $ 1,642,000 $ 1,460,000