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Segment Information (Schedule of Long-Lived Assets, by Geographical Areas) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]    
Long Lived Assets $ 134,050 $ 110,540
United States [Member]
   
Segment Reporting Information [Line Items]    
Long Lived Assets 54,888 55,442
Canada [Member]
   
Segment Reporting Information [Line Items]    
Long Lived Assets 46,476 49,754
Europe [Member]
   
Segment Reporting Information [Line Items]    
Long Lived Assets 31,701 4,157
International Waters [Member]
   
Segment Reporting Information [Line Items]    
Long Lived Assets 985 1,187
International [Member]
   
Segment Reporting Information [Line Items]    
Long Lived Assets $ 79,162 $ 55,098