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Retirement Plans (Details 11) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Significant Unobservable Inputs (Level 3) [Member]
Dec. 31, 2012
Significant Unobservable Inputs (Level 3) [Member]
Dec. 31, 2013
U.S. Pension Plans
Dec. 31, 2012
U.S. Pension Plans
Dec. 31, 2011
U.S. Pension Plans
Dec. 31, 2013
U.S. Pension Plans
Significant Unobservable Inputs (Level 3) [Member]
Dec. 31, 2012
U.S. Pension Plans
Significant Unobservable Inputs (Level 3) [Member]
Dec. 31, 2013
U.S. Pension Plans
Hedge Funds [Member]
Dec. 31, 2012
U.S. Pension Plans
Hedge Funds [Member]
Dec. 31, 2013
U.S. Pension Plans
Hedge Funds [Member]
Significant Unobservable Inputs (Level 3) [Member]
Dec. 31, 2012
U.S. Pension Plans
Hedge Funds [Member]
Significant Unobservable Inputs (Level 3) [Member]
Dec. 31, 2012
Non-U.S. Pension Plans
Dec. 31, 2013
Non-U.S. Pension Plans
Dec. 31, 2013
Non-U.S. Pension Plans
Significant Unobservable Inputs (Level 3) [Member]
Dec. 31, 2012
Non-U.S. Pension Plans
Significant Unobservable Inputs (Level 3) [Member]
Dec. 31, 2013
Non-U.S. Pension Plans
Bank and Insurance Investment Contracts [Member]
Dec. 31, 2012
Non-U.S. Pension Plans
Bank and Insurance Investment Contracts [Member]
Dec. 31, 2013
Non-U.S. Pension Plans
Bank and Insurance Investment Contracts [Member]
Significant Unobservable Inputs (Level 3) [Member]
Dec. 31, 2012
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, beginning balance $ 175,952 $ 147,788 $ 35,963 $ 13,057 $ 128,516 $ 106,572 $ 91,610 $ 7,025 $ 6,266 $ 7,025 [1] $ 6,266 [1] $ 6,266 [1] $ 6,018 $ 12,798 $ 40,820 $ 34,420 $ 29,697 $ 34,420 [2] $ 29,697 [2] $ 29,697 [2] $ 7,039
Net purchases (sales) and appreciation (depreciation) of defined benefit plan assets     5,482 4,524               759 248             4,723 4,276
Other plans' impact on fair value of defined benefit plan assets       18,382                   18,382             18,382
Fair value of defined benefit plan assets, ending balance $ 175,952 $ 147,788 $ 41,445 $ 35,963 $ 128,516 $ 106,572 $ 91,610 $ 7,025 $ 6,266 $ 7,025 [1] $ 6,266 [1] $ 7,025 [1] $ 6,266 [1] $ 35,859 $ 40,820 $ 34,420 $ 29,697 $ 34,420 [2] $ 29,697 [2] $ 34,420 [2] $ 29,697 [2]
[1] 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.
[2] Amount represents bank and insurance guaranteed investment contracts.