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Employee Benefit Plans (Narrative) (Details) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Pension Benefits [Member]
Dec. 31, 2010
Pension Benefits [Member]
Dec. 31, 2009
Pension Benefits [Member]
Dec. 31, 2011
Other Postretirement Benefits [Member]
Dec. 31, 2010
Other Postretirement Benefits [Member]
Dec. 31, 2009
Other Postretirement Benefits [Member]
Dec. 31, 2011
Other Pension Plans, Postretirement or Supplemental Plans, Defined Benefit [Member]
Dec. 31, 2010
Other Pension Plans, Postretirement or Supplemental Plans, Defined Benefit [Member]
Dec. 31, 2009
Other Pension Plans, Postretirement or Supplemental Plans, Defined Benefit [Member]
Dec. 31, 2009
Post-Remeasurement [Member]
Dec. 31, 2009
Pre-Remeasurement [Member]
Defined Benefit Plan Disclosure [Line Items]                              
Amendment to benefit plan, adjustment to benefit obligation   $ 55,500,000   $ 21,000,000                      
Postretirement benefit obligation, decrease in discount rate         4.91% 5.71%   4.52% 5.23%         5.68% 6.85%
Accumulated benefit obligation of pension plans   314,700,000 280,400,000                        
Benefit obligation for the unfunded pension plan   8,200,000                          
Accumulated benefit obligation for the unfunded pension plan   7,100,000                          
Benefit obligations         333,951,000 297,707,000 280,693,000 45,129,000 39,633,000 46,445,000          
Amortization of net prior service cost         (100,000)     (12,000,000)              
Defined Benefit Plan, Amortization of Net Gains (Losses)         (14,300,000)     400,000              
Defined benefit plan amortization period   5                          
Health care cost trend rate assumed   7.70%                          
Ultimate trend rate   4.50%                          
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate   2028                          
Effect of one-percentage-point increase in health care cost trend rate   500,000                          
Effect of one-percentage-point decrease in health care cost trend rate   400,000                          
Percentage of plan assets, equity securities   65.00%                          
Percentage of plan assets, fixed income securities   30.00%                          
Percentage of plan assets, cash   5.00%                          
Contributions to the pension plans 24,500,000                            
Other postretirement benefits payments                     $ 25,900,000 $ 18,100,000 $ 15,900,000