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Employee Benefits (Details) (USD $)
 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Employee Stock Ownership Plan and Trust (ESOP) [Member]
Jun. 30, 2012
Pension benefits [Member]
Jun. 30, 2011
Pension benefits [Member]
Jun. 30, 2012
Pension benefits [Member]
Jun. 30, 2011
Pension benefits [Member]
Jun. 30, 2012
Postretirement benefits [Member]
Jun. 30, 2011
Postretirement benefits [Member]
Jun. 30, 2012
Postretirement benefits [Member]
Jun. 30, 2011
Postretirement benefits [Member]
Dec. 31, 2011
Supplemental Executive Retirement Plan [Member]
Jun. 30, 2012
U.S. Postretirement Benefit Plans [Member]
Jun. 30, 2012
Canadian Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]                        
Number of former union employees not covered under plan               64        
Reduction in accumulated postretirement benefit obligation as result of modifications           $ 14,400,000   $ 14,400,000        
Discount rate assumptions used for remeasurement of costs and benefit obligation (in hundredths)                     1.87% 3.75%
Service cost   32,000 28,000 65,000 56,000 1,000 20,000 2,000 74,000      
Interest cost   46,000 45,000 93,000 90,000 18,000 183,000 43,000 481,000      
Amortization of prior service cost   27,000 29,000 55,000 55,000 (1,223,000) (1,615,000) (2,447,000) (3,231,000)      
Amortization of transition obligation           0 1,000 0 2,000      
Actuarial net (gain) loss   66,000 43,000 131,000 86,000 769,000 399,000 1,417,000 745,000      
Curtailment gain           0 (3,647,000) 0 (3,647,000)      
Net periodic benefit cost   171,000 145,000 344,000 287,000 (435,000) (4,659,000) (985,000) (5,576,000)      
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]                        
Contributions by employer on behalf of employees               400,000        
Estimated future employer contributions in current fiscal year           800,000   800,000        
Employer discretionary contribution amount                   $ 500,000    
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]                        
Shares contributed to ESOP (in shares) 177,000                      
Shares released from trust (in shares) 180,000                      
Total balance of share in the ESOP (in shares) 930