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Benefit Plans Fair Value of Plan Assets (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 95,353 $ 79,020
Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 55,532 40,137
Significant Observable Inputs (Level 2)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 39,821 38,883
Significant Unobservable Inputs (Level 3)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Cash and Cash Equivalents [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 9,127 7,056
Cash and Cash Equivalents [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 9,127 7,056
Cash and Cash Equivalents [Member] | Significant Observable Inputs (Level 2)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Cash and Cash Equivalents [Member] | Significant Unobservable Inputs (Level 3)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fixed Income Funds [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 35,891 [1] 35,091 [1]
Fixed Income Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [1] 0 [1]
Fixed Income Funds [Member] | Significant Observable Inputs (Level 2)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 35,891 [1] 35,091 [1]
Fixed Income Funds [Member] | Significant Unobservable Inputs (Level 3)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [1] 0 [1]
Equity Securities [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Target plan asset allocations 55.00% 55.00%
Fixed Income Securities [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Target plan asset allocations 45.00% 45.00%
All Cap Equity Fund [Member] | Actively Managed Investments [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 283 [2]  
All Cap Equity Fund [Member] | Actively Managed Investments [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 266 [2]  
All Cap Equity Fund [Member] | Actively Managed Investments [Member] | Significant Observable Inputs (Level 2)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 17 [2]  
All Cap Equity Fund [Member] | Actively Managed Investments [Member] | Significant Unobservable Inputs (Level 3)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [2]  
U.S. Large Cap Equity [Member] | Actively Managed Investments [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 32,286 [2] 22,749 [2]
U.S. Large Cap Equity [Member] | Actively Managed Investments [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 32,286 [2] 22,749 [2]
U.S. Large Cap Equity [Member] | Actively Managed Investments [Member] | Significant Observable Inputs (Level 2)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [2] 0 [2]
U.S. Large Cap Equity [Member] | Actively Managed Investments [Member] | Significant Unobservable Inputs (Level 3)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [2] 0 [2]
U.S. Mid Cap Equity [Member] | Actively Managed Investments [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 5,551 [2] 3,989 [2]
U.S. Mid Cap Equity [Member] | Actively Managed Investments [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 5,551 [2] 3,989 [2]
U.S. Mid Cap Equity [Member] | Actively Managed Investments [Member] | Significant Observable Inputs (Level 2)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [2] 0 [2]
U.S. Mid Cap Equity [Member] | Actively Managed Investments [Member] | Significant Unobservable Inputs (Level 3)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [2] 0 [2]
U.S. Small Cap Equity [Member] | Actively Managed Investments [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 3,236 [2] 2,174 [2]
U.S. Small Cap Equity [Member] | Actively Managed Investments [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 3,236 [2] 2,174 [2]
U.S. Small Cap Equity [Member] | Actively Managed Investments [Member] | Significant Observable Inputs (Level 2)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [2] 0 [2]
U.S. Small Cap Equity [Member] | Actively Managed Investments [Member] | Significant Unobservable Inputs (Level 3)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [2] 0 [2]
Non-U.S. Large Cap Equity [Member] | Actively Managed Investments [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 5,066 [2] 4,169 [2]
Non-U.S. Large Cap Equity [Member] | Actively Managed Investments [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 5,066 [2] 4,169 [2]
Non-U.S. Large Cap Equity [Member] | Actively Managed Investments [Member] | Significant Observable Inputs (Level 2)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [2] 0 [2]
Non-U.S. Large Cap Equity [Member] | Actively Managed Investments [Member] | Significant Unobservable Inputs (Level 3)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [2] 0 [2]
REIT [Member] | Passive Index Fund ETFs [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 3,913 [2] 3,792 [2]
REIT [Member] | Passive Index Fund ETFs [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 [2] 0 [2]
REIT [Member] | Passive Index Fund ETFs [Member] | Significant Observable Inputs (Level 2)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 3,913 [2] 3,792 [2]
REIT [Member] | Passive Index Fund ETFs [Member] | Significant Unobservable Inputs (Level 3)
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 0 [2] $ 0 [2]
[1] Actively managed portfolio of fixed income securities with the goal to exceed the Barclays 1-5 Year Government/Credit, Barclays Intermediate Government/Credit, and Merrill Lynch Preferred Stock Fixed Rate.
[2] Actively managed portfolio of securities with the goal to exceed the stated benchmark performance.