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Fair Value Measurements (Fair Value Measurements) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities - Municipal bonds | $ 22,559 | $ 21,322
Equity securities - Deferred comp fund | 19,254 | 17,831
Quoted Prices In Active Markets (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 15,505 | 13,717
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 3,749 | 4,114
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 0 | 0
Carrying Amount [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 19,254 | 17,831
Total Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 19,254 | 17,831
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 | 22,559 | 21,322
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 | 22,559 | 21,322
Municipal Bonds [Member] | Total Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities - Municipal bonds | 22,559 | 21,322
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 comp 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 comp fund | 3,749 | 4,114
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 comp 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 comp fund | 3,749 | 4,114
Money Market [Member] | Total Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 3,749 | 4,114
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 comp fund | 6,971 | 6,311
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 comp 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 comp 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 comp fund | 6,971 | 6,311
Balanced And Lifestyle [Member] | Total Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 6,971 | 6,311
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 comp fund | 3,263 | 2,724
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 comp 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 comp 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 comp fund | 3,263 | 2,724
Large Cap Growth [Member] | Total Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 3,263 | 2,724
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 comp fund | 1,973 | 1,936
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 comp 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 comp 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 comp fund | 1,973 | 1,936
Small Cap Value [Member] | Total Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 1,973 | 1,936
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 comp fund | 1,777 | 1,461
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 comp 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 comp 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 comp fund | 1,777 | 1,461
Fixed Income [Member] | Total Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 1,777 | 1,461
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 comp fund | 857 | 785
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 comp 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 comp fund | 0 | 0
International [Member] | Carrying Amount [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 857 | 785
International [Member] | Total Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 857 | 785
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 comp fund | 664 | 500
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 comp 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 comp 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 comp fund | 664 | 500
Mid Cap Growth [Member] | Total Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | $ 664 | $ 500

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