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Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Schedule of changes in accumulated other comprehensive income    
Beginning Balance - Currency Translation Adjustments $ 316 $ (11,043)
Beginning Balance (599) 1,649
Beginning Balance - Changes in pensions (159,560) (153,002)
Beginning Balance - Change in other postretirement defined benefit plans (4,297) (3,881)
Beginning Balance - Total (163,966) (166,741)
Other comprehensive income before reclassifications (net of tax) - Currency Translation Adjustments (11,957) 9,454
Other comprehensive income before reclassifications (net of tax) - Unrealized gain (loss) on derivatives (170) 320
Other comprehensive income before reclassifications (net of tax) - Changes in pensions      
Other comprehensive income before reclassifications (net of tax) - Changes in other postretirement defined benefit plans      
Other comprehensive income before reclassifications (net of tax) - Total (11,567) 9,045
Amounts reclassified from accumulated other comprehensive income (net of tax) - Currency translation adjustments      
Amounts reclassified from accumulated other comprehensive income (net of tax) - Unrealized gain (loss) on derivatives 70 (572)
Amounts reclassified from accumulated other comprehensive income (net of tax) - Changes in pensions 3,779 3,051
Amounts reclassified from accumulated other comprehensive income (net of tax) - Change in other postretirement defined benefit plans 48   
Amounts reclassified from accumulated other comprehensive income (net of tax) - Total 3,878 2,606
Net current period other comprehensive income (loss) - Currency translation adjustments (11,957) 9,454
Net current period other comprehensive income (loss) - Unrealized gain (loss) on derivatives 441 (820)
Net current period other comprehensive income (loss) - Changes in pensions 3,779 3,051
Net current period other comprehensive income (loss) - Change in other postretirement defined benefit plans 48 (34)
Net current period other comprehensive income (loss) - Total 3,878 11,651
Ending Balance - Currency Translation Adjustments (11,641) (1,589)
Ending Balance 12 509
Ending Balance - Changes in pensions (155,781) (149,951)
Ending Balance - Change in other postretirement defined benefit plans (4,249) (3,915)
Ending Balance - Total (171,655) (155,090)
Cash Flow Hedging [Member]
    
Schedule of changes in accumulated other comprehensive income    
Beginning Balance (425) 1,185
Other comprehensive income before reclassifications (net of tax) - Unrealized gain (loss) on derivatives 390 (409)
Amounts reclassified from accumulated other comprehensive income (net of tax) - Unrealized gain (loss) on derivatives 51 (411)
Net current period other comprehensive income (loss) - Unrealized gain (loss) on derivatives 441 (820)
Ending Balance $ 16 $ 365