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Pension and Other Post-retirement Benefits (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Pension Plans
       
Components of net periodic pension cost        
Service cost $ 1,138,000 $ 1,858,000 $ 3,414,000 $ 5,573,000
Interest cost 1,301,000 1,432,000 3,903,000 4,297,000
Expected return on plan assets (2,138,000) (1,948,000) (6,414,000) (5,844,000)
Amortization of prior service cost (580,000) (40,000) (1,740,000) (120,000)
Amortization of the net loss 919,000 690,000 2,757,000 2,070,000
Net periodic benefit cost 640,000 1,992,000 1,920,000 5,976,000
Additional benefits as a percentage of career average pay for each year     1.00%  
Number of hours of service need to be completed to avail additional benefit under amendment     1000 hours  
Employee age required to participate in the plan     70 years 6 months  
Employer contribution to pension or other post-retirement     0  
Other post-retirement benefits
       
Components of net periodic pension cost        
Interest cost 16,000 16,000 48,000 49,000
Amortization of the net loss 13,000 13,000 39,000 38,000
Net periodic benefit cost 29,000 29,000 87,000 87,000
Employer contribution to pension or other post-retirement     $ 0