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Other Comprehensive Income (Loss) And Accumulated Other Comprehensive Loss (Schedule Of Adjustments In Accumulated Other Comprehensive Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Other Comprehensive Income (Loss) And Accumulated Other Comprehensive Loss [Abstract]      
Foreign Currency Translation Adjustments, Beginning balance $ (18,107) $ (12,065) $ (29,881)
Foreign Currency Translation Adjustments (395) (5,955) 20,008
Foreign Currency Translation Adjustments, Tax (expense) benefit 558 (87) (2,192)
Foreign Currency Translation Adjustments, Other comprehensive income (loss) 163 (6,042) 17,816
Foreign Currency Translation Adjustments, Ending balance (17,944) (18,107) (12,065)
Pension Plans and Other Postretirement Benefits Adjustments, Beginning balance (51,562) (60,055) (63,568)
Pension Plans and Other Postretirement Benefits Adjustments, Prior service cost arising during the period   (1,242) (56)
Pension Plans and Other Postretirement Benefits Adjustments, Amortization of prior service cost included in net periodic pension cost 398 387 375
Pension Plans and Other Postretirement Benefits Adjustments, Net prior service cost   (855) 319
Actuarial net loss (gain) (44,629) 9,892 633
Pension Plans and Other Postretirement Benefits Adjustments, Amortization of actuarial net loss included in net periodic pension cost 3,745 4,225 3,696
Pension Plans and Other Postretirement Benefits Adjustments, Settlement loss     241
Pension Plans and Other Postretirement Benefits Adjustments, Actuarial net gain (loss) (40,884) 14,117 4,570
Pension Plans and Other Postretirement Benefits Adjustments, Amortization of transition obligation included in net periodic pension cost 53 15 12
Pension Plans and Other Postretirement Benefits Adjustments, Tax (expense) benefit 15,579 (4,784) (1,388)
Pension Plans and Other Postretirement Benefits Adjustments, Other comprehensive income (loss) (24,854) 8,493 3,513
Pension Plans and Other Postretirement Benefits Adjustments, Ending balance (76,416) (51,562) (60,055)
Accumulated Derivative Gain (Loss), Beginning balance (4,151) (2,664) (2,301)
Accumulated Derivative Gain (Loss), Adjustments (958) (2,434) (583)
Accumulated Derivative Gain (Loss), Tax (expense) benefit 373 947 220
Accumulated Derivative Gain (Loss), Other comprehensive income (loss) (585) (1,487) (363)
Accumulated Derivative Gain (Loss), Ending balance (4,736) (4,151) (2,664)
Marketable Securities, Beginning Balance 0 0 0
Marketable Securities, Adjustments 590 0 0
Marketable Securities, Tax (expense) benefit (226) 0 0
Marketable Securities, Other comprehensive income (loss) 364 0 0
Marketable Securities, Ending Balance 364 0 0
Accumulated Other Comprehensive Loss, Beginning balance (73,820) (74,784) (95,750)
Accumulated Other Comprehensive Loss, Other comprehensive income (loss) (24,912) 964 20,966
Accumulated Other Comprehensive Loss, Ending balance $ (98,732) $ (73,820) $ (74,784)