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Other Assets (Schedule of Other Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]      
Patents, at cost $ 5,401 $ 5,021  
Deposits on capital items 14,091 3,934  
Software development costs, at cost 2,057 2,057  
Investment in equity securities 259 1,331  
Other 700 549  
Other assets 18,464 9,568  
Patents [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Accumulated amortization (3,075) (2,826) (200)
Software development [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Accumulated amortization $ (969) $ (498) $ (100)