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Retirement Plans (Details 10) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets $ 257,488 $ 219,355  
Investments valued at NAV $ 7,935 7,389  
Redemption terms for investments valued at NAV The redemption terms for the hedge funds are generally quarterly with a 90 day notification period and there are no redemption restrictions.    
Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets $ 249,553 211,966  
Quoted Prices in Active Market for Identical Assets (Level 1) | Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 197,590 166,145  
Significant Other Observable Inputs (Level 2) | Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets   728  
Significant Unobservable Inputs (Level 3) | Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 51,963 45,093  
Bank and Insurance Investment Contracts [Member] | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 51,963 45,093 $ 38,943
U.S. Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 171,373 144,665 136,128
U.S. Pension Plans | Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 163,438 137,276  
U.S. Pension Plans | Quoted Prices in Active Market for Identical Assets (Level 1) | Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 163,438 136,548  
U.S. Pension Plans | Significant Other Observable Inputs (Level 2) | Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets   728  
U.S. Pension Plans | Mutual Funds [Member] | Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets $ 163,438 [1] $ 136,548 [2]  
U.S. Pension Plans | Mutual Funds [Member] | Portion in Fair Value Hierarchy [Member] | Large-Cap U S Companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Components of plan asset categories 45.00% 35.00%  
U.S. Pension Plans | Mutual Funds [Member] | Portion in Fair Value Hierarchy [Member] | International Growth Companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Components of plan asset categories 30.00% 38.00%  
U.S. Pension Plans | Mutual Funds [Member] | Portion in Fair Value Hierarchy [Member] | Fixed Income Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Components of plan asset categories 25.00% 27.00%  
U.S. Pension Plans | Mutual Funds [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) | Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets $ 163,438 [1] $ 136,548 [2]  
U.S. Pension Plans | Cash and Cash Equivalents [Member] | Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets [3]   728  
U.S. Pension Plans | Cash and Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2) | Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets [3]   728  
U.S. Retiree Healthcare Plan      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 11,125 9,142 8,001
U.S. Retiree Healthcare Plan | Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 11,125 9,142  
U.S. Retiree Healthcare Plan | Quoted Prices in Active Market for Identical Assets (Level 1) | Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 11,125 9,142  
U.S. Retiree Healthcare Plan | Mutual Funds [Member] | Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets $ 11,125 [4] $ 9,142 [5]  
U.S. Retiree Healthcare Plan | Mutual Funds [Member] | Portion in Fair Value Hierarchy [Member] | Large-Cap U S Companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Components of plan asset categories 41.00% 38.00%  
U.S. Retiree Healthcare Plan | Mutual Funds [Member] | Portion in Fair Value Hierarchy [Member] | International Growth Companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Components of plan asset categories 24.00% 19.00%  
U.S. Retiree Healthcare Plan | Mutual Funds [Member] | Portion in Fair Value Hierarchy [Member] | Fixed Income Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Components of plan asset categories 35.00% 43.00%  
U.S. Retiree Healthcare Plan | Mutual Funds [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) | Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets $ 11,125 [4] $ 9,142 [5]  
Non-U.S. Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 74,990 65,548 $ 60,441
Non-U.S. Pension Plans | Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 74,990 65,548  
Non-U.S. Pension Plans | Quoted Prices in Active Market for Identical Assets (Level 1) | Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 23,027 20,455  
Non-U.S. Pension Plans | Significant Unobservable Inputs (Level 3) | Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets 51,963 45,093  
Non-U.S. Pension Plans | Mutual Funds [Member] | Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets $ 17,244 [6] $ 16,737 [7]  
Non-U.S. Pension Plans | Mutual Funds [Member] | Portion in Fair Value Hierarchy [Member] | International Growth Companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Components of plan asset categories 32.00% 30.00%  
Non-U.S. Pension Plans | Mutual Funds [Member] | Portion in Fair Value Hierarchy [Member] | Fixed Income Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Components of plan asset categories 58.00% 56.00%  
Non-U.S. Pension Plans | Mutual Funds [Member] | Portion in Fair Value Hierarchy [Member] | Mortgages and Real Estate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Components of plan asset categories 1.00% 8.00%  
Non-U.S. Pension Plans | Mutual Funds [Member] | Portion in Fair Value Hierarchy [Member] | Other Global Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Components of plan asset categories 9.00% 6.00%  
Non-U.S. Pension Plans | Mutual Funds [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) | Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets $ 17,244 [6] $ 16,737 [7]  
Non-U.S. Pension Plans | Cash and Cash Equivalents [Member] | Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets [3] 5,783 3,718  
Non-U.S. Pension Plans | Cash and Cash Equivalents [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) | Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets [3] 5,783 3,718  
Non-U.S. Pension Plans | Bank and Insurance Investment Contracts [Member] | Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets [8] 51,963 45,093  
Non-U.S. Pension Plans | Bank and Insurance Investment Contracts [Member] | Significant Unobservable Inputs (Level 3) | Portion in Fair Value Hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets [8] $ 51,963 $ 45,093  
[1]
The mutual fund balance in the U.S. Pension Plans are invested in the following categories: 45% in the common stock of large-cap U.S. companies, 30% in the common stock of international growth companies and 25% 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: 35% in the common stock of large-cap U.S. companies, 38% in the common stock of international growth companies and 27% in fixed income bonds issued by U.S. companies and by the U.S. government and its agencies.
[3]
Primarily represents deposit account funds held with various financial institutions.
[4]
The mutual fund balance in the U.S. Retiree Healthcare Plan is invested in the following categories: 41% in the common stock of large-cap U.S. companies, 24% in the common stock of international growth companies and 35% in fixed income bonds of U.S. companies and U.S. government.
[5]
The mutual fund balance in the U.S. Retiree Healthcare Plan is invested in the following categories: 38% in the common stock of large-cap U.S. companies, 19% in the common stock of international growth companies and 43% in fixed income bonds of U.S. companies and U.S. government.
[6]
The mutual fund balance in the Non-U.S. Pension Plans is primarily invested in the following categories: 58% in international bonds, 32% in the common stock of international companies, 1% in mortgages and real estate and 9% in various other global investments.
[7]
The mutual fund balance in the Non-U.S. Pension Plans is invested in the following categories: 56% in international bonds and 30% in the common stock of international companies, 8% in mortgages and real estate and 6% in various other global investments.
[8]
Amount represents bank and insurance guaranteed investment contracts.