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Employee Benefits (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, employer matching contribution, percent of employee gross pay 4.00%    
Defined contribution plan, employer matching contributions $ 1,400,000 $ 1,200,000 $ 1,000,000
Other incentive-based compensation expense 13,500,000 10,700,000 9,600,000
Deferred compensation plan, accrued liability 6,200,000 5,400,000  
Qualified Pension Plan [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation 55,800,000 45,300,000  
Estimated 2013 amortization of prior service cost (credit) from accumulated other comprehensive loss into net period benefit cost (33,000)    
Estimated 2013 amortization of gain (loss) from accumulated other comprehensive loss into net period benefit cost   (1,700,000)  
Expected long-term return on plan assets 7.75% 8.00% 8.00%
Actual asset allocations 100.00% 100.00%  
Fair value of equity securities, maximum percentage held by a single issuer 10.00%    
Estimated future employer contributions in next fiscal year 5,000,000    
Qualified Pension Plan [Member] | Equity Securities [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocation, investment ranges, minimum 50.00%    
Target plan asset allocation, investment ranges, maximum 70.00%    
Actual asset allocations 55.00% 56.20%  
Qualified Pension Plan [Member] | Small-Cap Equity Securities [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocation, investment ranges, maximum 20.00%    
Qualified Pension Plan [Member] | Mid-Cap Equity Securities [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocation, investment ranges, maximum 20.00%    
Qualified Pension Plan [Member] | International Equity Securities [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocation, investment ranges, maximum 30.00%    
Qualified Pension Plan [Member] | Fixed Securities [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocation, investment ranges, minimum 30.00%    
Target plan asset allocation, investment ranges, maximum 50.00%    
Actual asset allocations 30.90% 39.70%  
Qualified Pension Plan [Member] | Cash and Cash Equivalents [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocation, investment ranges, minimum 0.00%    
Target plan asset allocation, investment ranges, maximum 10.00%    
Actual asset allocations 14.10% 4.10%  
Employer contribution, additional contribution during period 7,000,000    
Qualified Pension Plan [Member] | High Yield Bond [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocation, investment ranges, maximum 10.00%    
Non-Qualified Retirement Plans [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Available-for-sale securities and other short-term investments, rabbi trusts 8,300,000 8,900,000  
Accumulated benefit obligation 11,300,000 10,400,000  
Estimated 2013 amortization of prior service cost (credit) from accumulated other comprehensive loss into net period benefit cost (1,000)    
Estimated 2013 amortization of gain (loss) from accumulated other comprehensive loss into net period benefit cost   (196,000)  
Expected long-term return on plan assets 0.00% 0.00% 0.00%
Estimated future employer contributions in next fiscal year $ 731,000