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Segment Information (Schedule of Long-Lived Assets, by Geographical Areas) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
segment
item
Dec. 31, 2013
Segment Reporting Information [Line Items]    
Number of Co-CEOs 2  
Number of reporting segments 1  
Number of geographic areas 4  
Long Lived Assets $ 159,336 $ 158,264
United States [Member]
   
Segment Reporting Information [Line Items]    
Long Lived Assets 55,715 55,809
Canada [Member]
   
Segment Reporting Information [Line Items]    
Long Lived Assets 68,801 67,858
Europe [Member]
   
Segment Reporting Information [Line Items]    
Long Lived Assets 33,117 33,793
International Waters [Member]
   
Segment Reporting Information [Line Items]    
Long Lived Assets 1,703 804
Aruba [Member]
   
Segment Reporting Information [Line Items]    
Long Lived Assets 0 0
International [Member]
   
Segment Reporting Information [Line Items]    
Long Lived Assets $ 103,621 $ 102,455