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Fixed Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Cost $ 168,706 $ 149,665
Accumulated Depreciation (115,792) (101,928)
Net Book Value 52,914 47,737
Machinery and Equipment [Member]
   
Cost 111,356 100,373
Accumulated Depreciation (83,537) (73,521)
Net Book Value 27,819 26,852
Leasehold Improvements [Member]
   
Cost 57,350 49,292
Accumulated Depreciation (32,255) (28,407)
Net Book Value $ 25,095 $ 20,885