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Investments at Fair Value for Company Sponsored Pension Benefit Plans Within Fair Value Hierarchy (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 286,598,000 $ 254,556,000
Cash and cash equivalents
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 4,314,000 3,786,000
Common and collective trusts | International small cap
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 15,845,000 12,725,000
Common and collective trusts | Global/International equity
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 21,198,000 16,656,000
Common and collective trusts | Domestic equity – small/mid cap
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets   17,339,000
Common and collective trusts | International equity emerging markets
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 17,809,000 17,672,000
Common stock | Industrials
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 9,307,000 9,475,000
Common stock | Energy
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2,663,000 1,966,000
Common stock | Consumer
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 8,002,000 8,270,000
Common stock | Healthcare
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 6,013,000 7,386,000
Common stock | Finance
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 11,566,000 13,000,000
Common stock | Utilities
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,711,000 2,305,000
Common stock | Information technology
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 8,785,000 6,828,000
Common stock | Foreign
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 6,175,000 6,078,000
Mutual funds | Foreign large blend
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 18,492,000 18,907,000
Mutual funds | Long-term bond fund
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 137,031,000 114,557,000
Mutual funds | Mid-cap Growth Fund [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 18,009,000  
Corporate debt securities
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets   1,073,000
Investments
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 286,920,000 258,023,000
Payable held under securities lending agreement
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets (322,000) (3,467,000)
Fair Value, Inputs, Level 1 | Cash and cash equivalents
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 4,314,000 3,786,000
Fair Value, Inputs, Level 1 | Common and collective trusts | International small cap
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 1 | Common and collective trusts | Global/International equity
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 1 | Common and collective trusts | Domestic equity – small/mid cap
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets   0
Fair Value, Inputs, Level 1 | Common and collective trusts | International equity emerging markets
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 1 | Common stock | Industrials
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 9,307,000 9,475,000
Fair Value, Inputs, Level 1 | Common stock | Energy
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2,663,000 1,966,000
Fair Value, Inputs, Level 1 | Common stock | Consumer
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 8,002,000 8,270,000
Fair Value, Inputs, Level 1 | Common stock | Healthcare
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 6,013,000 7,386,000
Fair Value, Inputs, Level 1 | Common stock | Finance
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 11,566,000 13,000,000
Fair Value, Inputs, Level 1 | Common stock | Utilities
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,711,000 2,305,000
Fair Value, Inputs, Level 1 | Common stock | Information technology
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 8,785,000 6,828,000
Fair Value, Inputs, Level 1 | Common stock | Foreign
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 6,175,000 6,078,000
Fair Value, Inputs, Level 1 | Mutual funds | Foreign large blend
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 18,492,000 18,907,000
Fair Value, Inputs, Level 1 | Mutual funds | Long-term bond fund
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 137,031,000 114,557,000
Fair Value, Inputs, Level 1 | Mutual funds | Mid-cap Growth Fund [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 18,009,000  
Fair Value, Inputs, Level 1 | Corporate debt securities
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets   0
Fair Value, Inputs, Level 1 | Investments
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 232,068,000 192,558,000
Fair Value, Inputs, Level 2 | Cash and cash equivalents
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 2 | Common and collective trusts | International small cap
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 15,845,000 12,725,000
Fair Value, Inputs, Level 2 | Common and collective trusts | Global/International equity
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 21,198,000 16,656,000
Fair Value, Inputs, Level 2 | Common and collective trusts | Domestic equity – small/mid cap
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets   17,339,000
Fair Value, Inputs, Level 2 | Common and collective trusts | International equity emerging markets
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 17,809,000 17,672,000
Fair Value, Inputs, Level 2 | Common stock | Industrials
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 2 | Common stock | Energy
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 2 | Common stock | Consumer
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 2 | Common stock | Healthcare
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 2 | Common stock | Finance
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 2 | Common stock | Utilities
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 2 | Common stock | Information technology
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 2 | Common stock | Foreign
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 2 | Mutual funds | Foreign large blend
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 2 | Mutual funds | Long-term bond fund
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 2 | Mutual funds | Mid-cap Growth Fund [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0  
Fair Value, Inputs, Level 2 | Corporate debt securities
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets   1,073,000
Fair Value, Inputs, Level 2 | Investments
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 54,852,000 65,465,000
Fair Value, Inputs, Level 3 | Cash and cash equivalents
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Common and collective trusts | International small cap
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Common and collective trusts | Global/International equity
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Common and collective trusts | Domestic equity – small/mid cap
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets   0
Fair Value, Inputs, Level 3 | Common and collective trusts | International equity emerging markets
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Common stock | Industrials
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Common stock | Energy
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Common stock | Consumer
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Common stock | Healthcare
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Common stock | Finance
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Common stock | Utilities
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Common stock | Information technology
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Common stock | Foreign
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Mutual funds | Foreign large blend
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Mutual funds | Long-term bond fund
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Mutual funds | Mid-cap Growth Fund [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0  
Fair Value, Inputs, Level 3 | Corporate debt securities
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets   0
Fair Value, Inputs, Level 3 | Investments
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 0 $ 0