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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss (Schedule of Amounts Reclassified Out of Each Component 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
Pension plans and other postretirement benefits:      
Amortization of prior service cost $ 2 [1] $ 5 [1]  
Amortization of actuarial net loss 1,363 [1] 1,031 [1]  
Amortization of transition obligation 10 [1] 10 [1]  
Total pension plans and other postretirement benefits 1,375 1,046 4,568
Derivative instruments:      
Amounts reclassified from accumulated other comprehensive loss, Derivative Instruments 213 244 893
Amounts reclassified from accumulated other comprehensive loss, Accumulated Other Comprehensive Income (Loss) 1,588 1,290 4,421
Interest and financing expenses, net [Member]
      
Derivative instruments:      
Amounts reclassified from accumulated other comprehensive loss, Derivative Instruments 200 231  
Cost of rental [Member]
      
Derivative instruments:      
Amounts reclassified from accumulated other comprehensive loss, Derivative Instruments $ 13 $ 13  
[1] (a) These components of accumulated other comprehensive loss are included in the computation of net periodic benefit cost. See Note 4 in this Form 10-Q and Note 19 in our 2012 Annual Report for further information.