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Employee Benefit Plans (Narrative Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Employee Benefit Plans [Line Items]      
Defined Benefit Plan, Accumulated Benefit Obligation $ 106,800,000 $ 89,500,000  
Defined Benefit Plan, Amortization of Net Gains (Losses) 4,000,000    
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit) 600,000    
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities 60.00%    
Defined Benefit Plan, Target Allocation Percentage of Assets, Debt Securities 40.00%    
Defined Contribution Plan, Cost Recognized 6,400,000 5,100,000 3,900,000
Pension Plans, Defined Benefit [Member]
      
Employee Benefit Plans [Line Items]      
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year 5,000,000    
Other Postretirement Benefit Plans, Defined Benefit [Member]
      
Employee Benefit Plans [Line Items]      
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year $ 400,000