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Segment Information (Schedule of Long-Lived Assets, by Geographical Areas) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]    
Long Lived Assets $ 108,784 $ 110,540
United States [Member]
   
Segment Reporting Information [Line Items]    
Long Lived Assets 55,070 55,442
Canada [Member]
   
Segment Reporting Information [Line Items]    
Long Lived Assets 48,261 49,754
Europe [Member]
   
Segment Reporting Information [Line Items]    
Long Lived Assets 4,369 4,157
International Waters [Member]
   
Segment Reporting Information [Line Items]    
Long Lived Assets 1,084 1,187
International [Member]
   
Segment Reporting Information [Line Items]    
Long Lived Assets $ 53,714 $ 55,098