Annual report pursuant to Section 13 and 15(d)

SEGMENT INFORMATION, MAJOR CUSTOMERS AND GEOGRAPHICAL DATA Schedule of Revenue from External Customers and Long-Lived Assets (Details)

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SEGMENT INFORMATION, MAJOR CUSTOMERS AND GEOGRAPHICAL DATA Schedule of Revenue from External Customers and Long-Lived Assets (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Operating Revenues $ 75,998 $ 80,997 $ 74,237 $ 67,727 $ 70,895 $ 77,989 $ 62,985 $ 61,052 $ 298,959 $ 272,921 $ 258,148
Property and Equipment 803,652       787,805       803,652 787,805  
United States [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Operating Revenues                 245,581 213,920 185,677
Property and Equipment 579,509       475,315       579,509 475,315  
Latin America and the Caribbean [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Operating Revenues                 23,407 23,636 38,321
Property and Equipment 130,844       143,592       130,844 143,592  
Europe [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Operating Revenues                 22,008 25,749 21,352
Property and Equipment 73,631       134,156       73,631 134,156  
Asia [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Operating Revenues                 7,679 9,298 12,480
Property and Equipment 19,349       34,314       19,349 34,314  
Canada [Member]
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Operating Revenues                 284 318 318
Property and Equipment $ 319       $ 428       $ 319 $ 428