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Retirement Plans (Details 6) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Total recognized in other comprehensive income (loss) $ (31,566) $ 11,092 $ 18,835
U.S. Pension Plans
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0 9 7
Interest cost 5,505 5,806 6,166
Expected return on plan assets (8,034) (7,619) (7,443)
Net amortization: Net actuarial loss 3,432 3,009 1,782
Net periodic pension cost 903 1,205 512
Net (loss) gain arising (25,048) 2,042 23,170
Amortization: Net loss recognized in net periodic pension cost (3,432) (3,009) (1,782)
Total recognized in other comprehensive income (loss) (28,480) (967) 21,388
U.S. Retiree Healthcare Plan
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 915 720 545
Interest cost 333 350 364
Expected return on plan assets (355) (287) (277)
Net amortization: Prior service credit (54) (54) (53)
Net periodic pension cost 839 729 579
Net (loss) gain arising (1,629) 96 546
Amortization: Prior service credit recognized in net periodic pension cost 54 54 53
Total recognized in other comprehensive income (loss) (1,575) 150 599
Non-U.S. Pension Plans
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 4,467 3,752 1,872
Interest cost 1,966 1,988 1,079
Expected return on plan assets (901) (838) (313)
Net amortization: Prior service credit (216) (267) (89)
Net amortization: Net actuarial loss 516 367 37
Net periodic pension cost 5,832 5,002 2,586
Prior service credit (cost) 232 0 (3,619)
Net (loss) gain arising (1,940) 5,622 481
Amortization: Prior service credit recognized in net periodic pension cost 216 267 89
Amortization: Net loss recognized in net periodic pension cost (516) (367) (37)
Other plans' impact on other comprehensive income (loss) 0 5,970 0
Foreign currency impact on defined benefit plan amounts recognized in other comprehensive income (loss) 497 424 55
Total recognized in other comprehensive income (loss) $ (1,511) $ 11,916 $ (3,031)