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Retirement Plans (Details 10) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets $ 175,952 $ 147,788  
Quoted Prices in Active Market for Identical Assets (Level 1) [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 132,830 108,114  
Significant Other Observable Inputs (Level 2)
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 1,677 3,711  
Significant Unobservable Inputs (Level 3) [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 41,445 35,963 13,057
U.S. Pension Plans
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 128,516 106,572 91,610
U.S. Pension Plans | Quoted Prices in Active Market for Identical Assets (Level 1) [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 120,841 97,716  
U.S. Pension Plans | Significant Other Observable Inputs (Level 2)
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 650 2,590  
U.S. Pension Plans | Significant Unobservable Inputs (Level 3) [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 7,025 6,266  
U.S. Pension Plans | Mutual Funds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 117,718 [1] 93,061 [2]  
U.S. Pension Plans | Mutual Funds [Member] | Large-Cap U S Companies [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Components of plan asset categories 41.00% 34.00%  
U.S. Pension Plans | Mutual Funds [Member] | International Growth Companies [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Components of plan asset categories 33.00% 27.00%  
U.S. Pension Plans | Mutual Funds [Member] | Fixed Income Bonds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Components of plan asset categories 26.00% 39.00%  
U.S. Pension Plans | Mutual Funds [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 117,718 [1] 92,830 [2]  
U.S. Pension Plans | Mutual Funds [Member] | Significant Other Observable Inputs (Level 2)
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets   231 [2]  
U.S. Pension Plans | Equity Securities
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 3,123 [3] 4,886 [3]  
U.S. Pension Plans | Equity Securities | Quoted Prices in Active Market for Identical Assets (Level 1) [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 3,123 [3] 4,886 [3]  
U.S. Pension Plans | Cash and Cash Equivalents [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 650 [4] 2,359 [4]  
U.S. Pension Plans | Cash and Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2)
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 650 [4] 2,359 [4]  
U.S. Pension Plans | Hedge Funds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 7,025 [5] 6,266 [5]  
U.S. Pension Plans | Hedge Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 7,025 [5] 6,266 [5] 6,018
U.S. Retiree Healthcare Plan
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 6,616 5,357 4,319
U.S. Retiree Healthcare Plan | Quoted Prices in Active Market for Identical Assets (Level 1) [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 5,589 4,236  
U.S. Retiree Healthcare Plan | Significant Other Observable Inputs (Level 2)
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 1,027 1,121  
U.S. Retiree Healthcare Plan | Mutual Funds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 5,589 [6] 4,236 [7]  
U.S. Retiree Healthcare Plan | Mutual Funds [Member] | Large-Cap U S Companies [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Components of plan asset categories 58.00% 63.00%  
U.S. Retiree Healthcare Plan | Mutual Funds [Member] | International Growth Companies [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Components of plan asset categories 12.00% 9.00%  
U.S. Retiree Healthcare Plan | Mutual Funds [Member] | Fixed Income Bonds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Components of plan asset categories 30.00% 28.00%  
U.S. Retiree Healthcare Plan | Mutual Funds [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 5,589 [6] 4,236 [7]  
U.S. Retiree Healthcare Plan | Cash and Cash Equivalents [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 1,027 [4] 1,121 [4]  
U.S. Retiree Healthcare Plan | Cash and Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2)
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 1,027 [4] 1,121 [4]  
Non-U.S. Pension Plans
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 40,820 35,859 12,798
Non-U.S. Pension Plans | Quoted Prices in Active Market for Identical Assets (Level 1) [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 6,400 6,162  
Non-U.S. Pension Plans | Significant Unobservable Inputs (Level 3) [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 34,420 29,697  
Non-U.S. Pension Plans | Cash and Cash Equivalents [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 6,400 [4] 6,162 [4]  
Non-U.S. Pension Plans | Cash and Cash Equivalents [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 6,400 [4] 6,162 [4]  
Non-U.S. Pension Plans | Bank and Insurance Investment Contracts [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 34,420 [8] 29,697 [8]  
Non-U.S. Pension Plans | Bank and Insurance Investment Contracts [Member] | Significant Unobservable Inputs (Level 3) [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets $ 34,420 [8] $ 29,697 [8] $ 7,039
[1] The mutual fund balance in the U.S. Pension Plans are invested in the following categories: 41% in the common stock of large-cap U.S. companies, 33% in the common stock of international growth companies, and 26% in fixed income bonds issued by U.S. companies and by the U.S. government and its agencies.
[2] The mutual fund balance in the U.S. Pension Plans are invested in the following categories: 34% in the common stock of large-cap U.S. companies, 27% in the common stock of international growth companies, and 39% in fixed income bonds issued by U.S. companies and by the U.S. government and its agencies.
[3] Represents primarily amounts invested in common stock of technology, healthcare, financial, energy and consumer staples and discretionary U.S. companies.
[4] Primarily represents money market funds held with various financial institutions.
[5] Hedge fund invests in both short and long term U.S. common stocks. Management of the hedge funds has the ability to shift investments from value to growth strategies, from large to small capitalization stocks and from a net long position to a net short position.
[6] The mutual fund balance in the U.S. Retiree Healthcare Plan is invested in the following categories: 58% in the common stock of large-cap U.S. companies, 12% in the common stock of international growth companies and 30% in fixed income bonds of U.S. companies and U.S. government.
[7] The mutual fund balance in the U.S. Retiree Healthcare Plan is invested in the following categories: 63% in the common stock of large-cap U.S. companies, 9% in the common stock of international growth companies and 28% in fixed income bonds of U.S. companies and U.S. government.
[8] Amount represents bank and insurance guaranteed investment contracts.