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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss (Schedule of Components of Accumulated Other Comprehensive Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Pension Plans and Other Postretirement Benefits, Beginning Balance $ (96,139) $ (76,416) $ (76,416)
Derivative Instruments, Beginning Balance (4,173) (4,736) (4,736)
Foreign Currency Translation Adjustments, Beginning Balance (10,377) (17,944) (17,944)
Marketable Securities, Beginning Balance 0 364 364
Accumulated Other Comprehensive Income (Loss), Beginning Balance (110,689) (98,732) (98,732)
Other comprehensive income (loss) before reclassifications, Pension Plans and Other Postretirement Benefits 0   (24,291)
Other comprehensive income (loss) before reclassifications, Derivative Instruments 0 (139) (330)
Other comprehensive income (loss) before reclassifications, Foreign Currency Translation Adjustments (18,280) 6,669 7,567
Other comprehensive income (loss) before reclassifications, Marketable Securities 0 265 676
Other comprehensive income (loss) before reclassifications, Accumulated Other Comprehensive Income (Loss) (18,280)   (16,378)
Amounts reclassified from accumulated other comprehensive loss, Pension Plans and Other Postretirement Benefits 1,375 1,046 4,568
Amounts reclassified from accumulated other comprehensive loss, Derivative Instruments 213 244 893
Amounts reclassified from accumulated other comprehensive loss, Foreign Currency Translation Adjustments 0   0
Amounts reclassified from accumulated other comprehensive loss, Marketable Securities 0   (1,040)
Amounts reclassified from accumulated other comprehensive loss, Accumulated Other Comprehensive Income (Loss) 1,588 1,290 4,421
Total pension plans and other postretirement benefits 1,375 1,046 (19,723)
Total derivative instruments 213 105 563
Other comprehensive income (loss), Foreign Currency Translation Adjustments (18,280)   7,567
Other comprehensive income (loss), Marketable Securities 0   (364)
Other comprehensive (loss) income (16,692) 8,085 (11,957)
Pension Plans and Other Postretirement Benefits, Ending Balance (94,764)   (96,139)
Derivative Instruments, Ending Balance (3,960)   (4,173)
Foreign Currency Translation Adjustments, Ending Balance (28,657)   (10,377)
Marketable Securities, Ending Balance 0   0
Accumulated Other Comprehensive Income (Loss), Ending Balance $ (127,381)   $ (110,689)