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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities - Municipal bonds $ 11,647 $ 11,445
Equity securities - Deferred compensation fund 22,998 22,200
Quoted Prices In Active Markets (Level 1) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 19,510 18,608
Significant Other Observable Inputs (Level 2) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 3,488 3,592
Significant Unobservable Inputs (Level 3) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 0 0
Carrying Amount [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 22,998 22,200
Total Fair Value [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 22,998 22,200
Municipal bonds [Member] | Quoted Prices In Active Markets (Level 1) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities - Municipal bonds 0 0
Municipal bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities - Municipal bonds 11,647 11,445
Municipal bonds [Member] | Significant Unobservable Inputs (Level 3) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities - Municipal bonds 0 0
Municipal bonds [Member] | Carrying Amount [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities - Municipal bonds 11,647 11,445
Municipal bonds [Member] | Total Fair Value [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities - Municipal bonds 11,647 11,445
Money Market [Member] | Quoted Prices In Active Markets (Level 1) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 0 0
Money Market [Member] | Significant Other Observable Inputs (Level 2) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 3,488 3,592
Money Market [Member] | Significant Unobservable Inputs (Level 3) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 0 0
Money Market [Member] | Carrying Amount [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 3,488 3,592
Money Market [Member] | Total Fair Value [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 3,488 3,592
Balanced and Lifestyle [Member] | Quoted Prices In Active Markets (Level 1) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 8,450 8,174
Balanced and Lifestyle [Member] | Significant Other Observable Inputs (Level 2) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 0 0
Balanced and Lifestyle [Member] | Significant Unobservable Inputs (Level 3) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 0 0
Balanced and Lifestyle [Member] | Carrying Amount [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 8,450 8,174
Balanced and Lifestyle [Member] | Total Fair Value [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 8,450 8,174
Large Cap Growth [Member] | Quoted Prices In Active Markets (Level 1) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 4,327 4,292
Large Cap Growth [Member] | Significant Other Observable Inputs (Level 2) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 0 0
Large Cap Growth [Member] | Significant Unobservable Inputs (Level 3) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 0 0
Large Cap Growth [Member] | Carrying Amount [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 4,327 4,292
Large Cap Growth [Member] | Total Fair Value [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 4,327 4,292
Small Cap Value [Member] | Quoted Prices In Active Markets (Level 1) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 2,506 2,173
Small Cap Value [Member] | Significant Other Observable Inputs (Level 2) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 0 0
Small Cap Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 0 0
Small Cap Value [Member] | Carrying Amount [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 2,506 2,173
Small Cap Value [Member] | Total Fair Value [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 2,506 2,173
Fixed Income [Member] | Quoted Prices In Active Markets (Level 1) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 2,052 1,962
Fixed Income [Member] | Significant Other Observable Inputs (Level 2) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 0 0
Fixed Income [Member] | Significant Unobservable Inputs (Level 3) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 0 0
Fixed Income [Member] | Carrying Amount [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 2,052 1,962
Fixed Income [Member] | Total Fair Value [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 2,052 1,962
International [Member] | Quoted Prices In Active Markets (Level 1) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 1,136 1,079
International [Member] | Significant Other Observable Inputs (Level 2) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 0 0
International [Member] | Significant Unobservable Inputs (Level 3) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 0 0
International [Member] | Carrying Amount [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 1,136 1,079
International [Member] | Total Fair Value [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 1,136 1,079
Mid Cap Growth [Member] | Quoted Prices In Active Markets (Level 1) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 1,039 928
Mid Cap Growth [Member] | Significant Other Observable Inputs (Level 2) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 0 0
Mid Cap Growth [Member] | Significant Unobservable Inputs (Level 3) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 0 0
Mid Cap Growth [Member] | Carrying Amount [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund 1,039 928
Mid Cap Growth [Member] | Total Fair Value [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities - Deferred compensation fund $ 1,039 $ 928